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Claude Sonnet 4.6 vs Opus 4.6: Who Wins?

The Nerdy Novelist · 4,540 words · 21 min read

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0:00We've got another cool, brand-new model

0:02to test. All of these AI companies seem

0:05to be really competing with each other,

0:07trying to one-up each other at every

0:09turn, and the only winners are those of

0:11us that actually use the technology that

0:12they are putting out there because of

0:14this rapid rate of improvement. Now, I

0:17recently did a video about Claude Opus

0:194.6. I found it to be a marginal

0:22improvement, but actually maybe not even

0:24that, maybe just more or less the same

0:26as Claude Opus 4.5. But today, we're

0:29talking about Claude Sonnet 4.6, which

0:32is the next upgrade for the Sonnet

0:34model. Now, in the past, back in the

0:36Claude 3 days, Claude Sonnet ended up

0:38eventually passing Opus as being the

0:40best model, especially once we got to

0:42Claude Sonnet 3.7, which was a fantastic

0:44model at its time. It did some things

0:47I'd never seen an AI model do before. Of

0:49course, now many models can do what that

0:51model did, but at the time it was really

0:54awesome. And so, I do think that some of

0:56these little minor improvements that we

0:58see to these models can actually have a

1:00big effect. Today's video, we're going

1:02to go through my standard test prompts

1:04for Sonnet 4.6. And uh because we've

1:08just done Opus 4.6, I think it's best

1:11that we do a a small comparison between

1:13the two, just to see is 4.6 at the same

1:16level as Opus 4.6. And uh if so, you

1:19know, that's great because it means that

1:20we could have a much cheaper model.

1:25>> [snorts]

1:27>> So, let's start with the specs. First of

1:28all, Claude Sonnet 4.6 is the same input

1:31and output price as the previous

1:33versions of Claude Sonnet, which is $3

1:35per million tokens of input and $15 per

1:37million tokens of output. So, this is

1:40great because it's uh it's a kind of

1:42that's in the standard mid-tier range

1:44for as far as price goes. It's not that

1:47expensive, not that inexpensive. Uh you

1:49can get a lot in it a lot more

1:50inexpensive than this, but you know,

1:52it's pretty standard middle-of-the-road

1:54price. And definitely a lot cheaper than

1:56Claude Opus, which I believe Yeah, Opus

2:00is a little bit more at $5 per million

2:02tokens of input and $25 per million

2:04tokens of output. Not as big of a

2:06difference compared to past versions of

2:09Opus, but uh still more expensive than

2:12Sonnet. All right, the other big thing

2:14about Claude Sonnet 4.6 is is the fact

2:16that it now has a 1 million token

2:18context window. But, if you recall my

2:21last video on Opus 4.6, this is not

2:24necessarily as impressive as people

2:25think it is. Just being able to

2:27theoretically, technically contain that

2:30many tokens in its prompts is not

2:32necessarily mean that it's good at

2:34retrieving all of the information in

2:36there. I've put like entire books into

2:39these models and asked it to do a

2:41chapter-by-chapter summary, and it can't

2:43do it. It'll give me like maybe 12 out

2:46of the chapters that I put there, but

2:47it'll skip chapters, it'll miss some, it

2:49won't get all the way to the end, you

2:51know, it'll do stuff like that because

2:52it's not really able to cohesively hold

2:56all of that information at one time.

2:57Models are getting better at this thing,

2:59so we might see that change in the

3:02future, but so far the context window is

3:04not really as impressive to me as how

3:07well it does with a small amount of

3:09context, and I generally tell people not

3:11to let their context get a little higher

3:13than 30,000 or so. If you're getting

3:15higher than that, you have a

3:16watered-down prompt, it's not actually

3:18going to perform well, and you'll be

3:19spending more. If you summarize a lot of

3:22your content that you're putting into

3:25your

3:26prompts, the context should say,

3:28that's going to perform a lot better,

3:30generally speaking, and it'll be

3:31cheaper. Anyway, that's my little high

3:32horse there. I'll get off of that, and

3:34let's actually go and start looking

3:36through some of these prompts. Now, I

3:38intentionally give really simple prompts

3:41for most of these. Couple of people can

3:43have come up to me recently and said,

3:44"Why don't you like give it samples of

3:46your own writing and ask it to do all of

3:48this and stuff?" And I'm like, "Of

3:49course, I do that when I'm actually

3:51writing with these tools for real. But

3:53for these prompts, I want to see how

3:55well does it do right out of the gate

3:57without any of that super prompting

4:00techniques that we use.

4:02Like if I say it right a few ad

4:04headlines for this, I know I could give

4:06it examples of high-performing ads and

4:08the output that I will get is going to

4:10be way better. But if I just say, "Give

4:12me 20 ad headlines for this with no

4:14other context." and then it also gives

4:16me amazing ads, then I know that the

4:18model itself is much more powerful. So,

4:21that's just my my thoughts on that and

4:23the reason I do these prompts really

4:24simply. And this first one is the

4:25logline prompt where I ask it to give me

4:2820 loglines for an epic fantasy series.

4:30And back when I did Claude Opus 4.6,

4:33there were a few that I actually thought

4:34were really good. And looking through

4:35this list, none of them are bad per se,

4:38like they will all create a they're all

4:41kind of a cohesive story, they all make

4:42sense. I'm still seeing a lot of the

4:45same tropes coming up over and over

4:47again, like the cartographer here is

4:50always there, a disgraced knight is

4:52always there. But these aren't

4:54necessarily bad given the fact that I

4:56gave it no context. If you give it more

4:58context, then it'll give you better

4:59ideas. But they are kind of generic for

5:01what I gave it. But there are a few that

5:03are pretty good, like this one here, a

5:04young grave digger grave digger who can

5:07raise the dead must build an undead army

5:09to overthrow a tyrannical emperor, but

5:11every soldier she resurrects returns

5:12with a singular desire to kill her.

5:14Yeah, that's not a bad a bad one right

5:17there. Kind of simple, you obviously,

5:18especially for epic fantasy, you would

5:20need to pull in a whole lot more ideas

5:21to make it a fully fleshed out thing,

5:23but it could be a good place to start.

5:25All right, the next big prompt is the

5:27outline prompt. This is where I give it

5:28a an outline template and just and then

5:31like a one paragraph description of a

5:34book that I want to write, a concept,

5:35and then let it run wild with those two

5:37elements. First of all, it gave me a

5:39couple of things that I thought were

5:41really interesting. It gives me these

5:43core story elements, like a reference

5:45sheet, which I didn't ask it for, and I

5:49sometimes like when AI gives me things

5:51that I didn't ask it for. Sometimes I

5:52don't though, because obviously if it

5:54does that, that means that it was it's

5:57maybe not following the prompt as well.

5:59But in this case, I thought this was a

6:00really good introduction to bring

6:03together just to kind of keep it in its

6:05own memory as it's writing the rest of

6:07the thing. Hopefully that results in a

6:09more cohesive outline. And looking at

6:11this first one here, here's the

6:13prologue. This is a pretty length

6:15description of a prologue, and looking

6:17through it actually is really

6:18interesting. It's a little bit less

6:19generic than I'm used to seeing, so

6:21that's good. A lot of times these

6:22prologues can be very vague, like, "Oh,

6:25we see an image of such and such." But

6:27then it doesn't really there's no story

6:30to it, you know? This actually does tell

6:32a kind of isolated story that sets the

6:34tone of the story, but isn't really

6:36about the protagonist, uh which is what

6:38your prologue usually should be. Tells

6:40the story of this guy named Sarah Bohl,

6:43a middle-aged soldier in Thornhaven's

6:45gray livery running. He is clearly a

6:47trained fighter, but he is terrified. He

6:48has been expelled through Thornhaven's

6:50great gate. We see it sealed behind him

6:52with the sound like a mountain

6:53swallowing itself, and now he's alone in

6:55the darkness outside. And it kind of

6:56goes through his little brief story,

6:58which does not end well. And then in

7:00chapter one, we finally get to the

7:02actual protagonist, Latham Volgerous. I

7:05gave the first name here, but the

7:06Volgerous it made up. One of the things

7:08I often look for with this prompt is the

7:10save the cat moment, which uh I in my

7:13template tell it to do in chapter one.

7:15And usually it gives me a really like

7:17random save the cat moment that doesn't

7:19have anything to do with a plot. And

7:21this one is a little better, it's not

7:23the best. Uh neither was the one for

7:24Opus 4.6, but it's a little bit better,

7:27and I think uh cuz it does kind of show

7:30the save the cat moment in a way that's

7:31more consistent with the character

7:32compared to other past versions of this

7:34that I've seen, cuz the character is

7:36like this Eric and Prince kind of a

7:37thing, but then he has this moment where

7:39he gives some food to a hungry little

7:42girl. but the way it describes that it's

7:44it's more than just like a passing thing

7:46and it's much more consistent with his

7:47character, which I thought was good. I

7:50would probably still change this myself

7:52just to be something a little bit more

7:53interesting, but it is an improvement.

7:55And then fast-forwarding here a little

7:57bit to look at the inciting incident

7:59chapter, he this character is summoned

8:01before his father, but it's not a

8:03private meeting. It's a formal audience

8:05in a great hall with a full council

8:06present and an honor guard, and he's

8:09falsely accused of some things that he

8:10did and I like that it says here, "These

8:13charges are technically true, but they

8:15are framed as sedition." What I like

8:16about this, the reason I like this is

8:18that it's clearly drawing on what it

8:19wrote in the past chapters and it's a

8:22little bit more cohesive than sometimes

8:23AI does. A lot of times with this

8:25outlining prompt, the AI models will

8:27sort of it's almost like a separate

8:29story for each chapter that have a

8:31little bit of cohesiveness together, but

8:33a lot of it is very like episodic and

8:35stilted. This feels like it's a complete

8:38outline that it's connected together.

8:40And I'd have to go through and read the

8:41entire thing, which is let me check on

8:43how long this prompt goes for this

8:46outline goes for. All right, so this

8:48prompt

8:50was almost 18,000 words, which is a

8:52very, very, very, very long output. I

8:56think this is actually pretty good. Back

8:58when Claude Sonnet 3.7 was out, that

9:02model at its time was by far the best

9:05model for outlining. It was really,

9:07really good at it compared to other

9:08models of the time. I think Sonnet is

9:10actually still really, really good at

9:11outlines. I feel like it's almost

9:13slightly less creative than Opus, but as

9:17a result sticks to your stuff better

9:19than Opus. Opus can sometimes go in wild

9:21directions when you're outlining with

9:23it. Quick pause, if you're an author who

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9:48There's no commitment to join though and

9:49you'll still be able to get all of the

9:51freebies you signed up for either way.

9:52All right, back to the video. So, on the

9:54whole, I think this is actually a really

9:56good results. I'd say this is arguably a

9:58little bit better than what I got out of

10:004.6 Opus, which does do a few good

10:02things. I do feel like the prologue I

10:04got with Opus was it was good but it was

10:07also kind of the same sort of story that

10:09I've heard many times with this prompt.

10:11They're certainly not bad compared to

10:13each other. They're like neck and neck

10:14on this one. But given the slight

10:16inexpensiveness of Sonnet, I might go

10:18with Sonnet on this one really if I'm

10:20doing outlining tasks. So, just

10:22something to think on there. Let's move

10:24on to the basic prose prompt with both

10:26of these. So, this is where we're really

10:28going to compare between Opus 4.6 and

10:30Sonnet 4.6. This is just to see I do

10:33this exact scene every time that I do

10:35these tests. The reason I like doing an

10:37epic fantasy with this is because AI

10:39typically struggles with anything is set

10:41in a historical type time frame when

10:43compared to contemporary. AI is usually

10:45a lot better at contemporary stuff like

10:47a contemporary romance or an urban

10:48fantasy or something like that. You're

10:50much more likely to get good results in

10:51the prose out of the AI for those

10:53compared to something a little bit more

10:55ancient. So, if it can do this, I have

10:57high confidence that it can do other

10:59genres as well. Now, just looking

11:00through this, there's an interesting

11:02moment here that is not prompted but

11:04that is actually really, really good

11:06here where he says he had been he had

11:08been seven when he left Varloden with

11:10the expedition. Seven members that was.

11:11He counted them every night by habit as

11:13Overseer Merritt had insisted, "Count

11:15your people before you count your

11:16supplies." And he had counted them every

11:18night since lying in the dark and

11:20watching the numbers reduce themselves.

11:21Six, four, two, one. I like the emphasis

11:24on one. Haldir looked back. He knew

11:26better than to look. Every account,

11:27every training session, every greybeard

11:29at the society hall who had actually

11:30crossed the Ash Fell said the same

11:32thing. You look back and you slow down

11:34and you slow down and it's done. These

11:36again are little details I did not

11:37prompt it for which can be a good thing

11:39if they fit with your world. He looked

11:41back anyway because something in him

11:43needed to know how much time he had left

11:44to exist in. They were closer than he'd

11:46hoped, closer than they had been at

11:48midday when he'd been allowed to when

11:50he'd last allowed himself to count. Two

11:52dozen at least, perhaps more the edges,

11:53gray shapes swallowed by gray distance.

11:55They moved the way the hungry always

11:57moved, that wrong shuddering gait, limbs

11:59snapping forward

12:00jerks as though controlled by someone

12:01who had been told about walking and

12:03never seen it done. They made no sound

12:05he could hear over the wind. They never

12:06did. That was the worst of it somehow,

12:08the silence, the absolute indifference

12:10of their pursuit and as though consuming

12:11him was simply a thing that would

12:13happen, patient and inevitable as

12:15weather. I don't like that last phrase.

12:16That's a little AI sloppy but that was

12:19actually a pretty solid paragraph

12:20overall. If we compare that moment to

12:23the same part of the same prompt with

12:25Opus 4.6, scattered across the darkening

12:27horizon like stones come loose from the

12:29earth itself, gray shapes move against

12:31the gray land. At first glance, they

12:33might have been nothing, tricks of the

12:34fading light, outcrops of rock shifting

12:36in the heat haze that still clung to the

12:38ground. A rock did not move like that.

12:39Nothing living moved like that. They

12:41came in stuttering, broken surges,

12:43bodies jerking forward in spasms that

12:45covered ground with a horrible deceptive

12:46speed, limbs snapping into motion as if

12:48yanked by invisible strings then

12:50freezing then surging again. Two dozen

12:52at least spread in a loose and

12:53tightening arc across the waste behind

12:55him. Looking through this, I almost

12:57think that Sonnet 4.6 is better. I'm

13:00genuine like this is the first time I've

13:02read through this. I'm genuinely

13:03surprised right now. Now, you'd have to

13:05work with these things a lot more to

13:06kind of get a sense of their quirks but

13:08I do feel like there's a lot more like

13:10sloppy AI sloppy phrases and the kind of

13:14an over drama in the way that Opus 4.6

13:17explains this but yeah, I think this is

13:20actually pretty good. Let's try the next

13:22one which is the same scene but using a

13:25a advanced prompt that it does include

13:27more prompting

13:28examples of my style and cetera. Let's

13:30find that same moment. He looked back.

13:32They were there. Of course they were.

13:34Two dozen scattered across the shelf

13:35rock in a loose uneven line maybe 400

13:37yards behind him. The light was bad now

13:38and their gray skin swallowed what

13:40remained of it. They barely separated

13:41from the stone just shapes in the dusk

13:43that moved wrong. Their jerkiness was

13:45what always betrayed them first, not the

13:46stumble of something tired but a

13:47hitching stop-start and pull like

13:49puppets on a drunk man's string. Some of

13:51them had already fixed directions

13:53straight at him. Haldor turned back to

13:55Vardan and walked faster. All right, so

13:57looking at that now, I don't think this

13:59one is quite as good. So maybe we just

14:01got lucky on that first one. There are a

14:03couple of AI slopisms like just shapes

14:06in the dusk that moved wrong, you know,

14:07these kind of like overly dramatic

14:09sayings. Their gray skin swallowed what

14:12remained. But still not bad and still

14:14maybe better than what we were getting

14:15out of Opus. So that's interesting to

14:17me. All right, the next one is the

14:19dialogue prose template and this is one

14:21where I give it another scene, same

14:23story but one with more dialogue. So

14:25let's look at what Opus gave us first.

14:28Let's start here. A man died at the

14:30gates tonight, he said. His boots rang

14:32against the stone floor as he crossed

14:33the hall. Two of the king's guards

14:34shifted at his approach. Not

14:36threatening, not yet. Attentive in the

14:37way of men trained to read the weight of

14:39a footstep. All right, there was a lot

14:40of prose there. Like, I know, said

14:41Store, King of Vardan. You know? As

14:44Lathen stopped at the base of the dais,

14:45his jaw tight. Then you know the gates

14:47stay shut. You know we watched him die.

14:49That's the second time in a month,

14:50father. The second time we've left

14:52someone out there to be taken by the

14:53hungry while we stood behind our walls

14:55and did nothing. All right, so let's

14:57look at that same moment here inside of

14:59what Sonnet 4.6 gave us. They left him

15:01to die. Lathen's voice carried the full

15:03length of the room. He didn't soften it.

15:04Again, the king regarded him with a

15:06peculiar stillness he had perfected over

15:08decades. Not calm, Lathen knew, but the

15:09shape of calm more like armor. There's

15:12some AI slopisms in there. More like

15:14armor. A lot of metaphors and stuff like

15:16that. Around the throne, the usual

15:18constellation of advisors and courtiers

15:19shuffled and looked away. There were

15:21procedures. A man died screaming at your

15:23gate, Father. Laethan crossed the

15:25polished stone floor, each footfall

15:26deliberate. I heard him. Half the city

15:28heard him, and we did nothing. He

15:29stopped at the foot of the dais. This is

15:31the second time in a month. The law, you

15:33make the law. So, looking at this, I

15:35think this is close. This is a little

15:37bit of a tough one cuz it's actually

15:39pretty close. But, it's actually close

15:41enough that I wouldn't say that Sonnet

15:43is worse, especially for the price tag.

15:46The fact that this is almost half the

15:48price of Opus, not quite, but almost, is

15:51encouraging, I think. If we can get

15:53results these good this good for half

15:56the price of Opus, it might be worth it

15:57to me. Let's take a look at the Editing

15:59Pros template. So, this is where I give

16:01it the same scene that was written with

16:02a really poor AI model and ask it to

16:05rewrite it to improve the pros. The hall

16:07stretched before him, vaulted stone,

16:08cold torchlight, the smell of old smoke

16:10and older power. His father sat at its

16:11far end upon the ash wood throne,

16:13watching his son's approach with a

16:15peculiar stillness of a man who has long

16:16since learned to mistake patience for

16:18wisdom. Okay, that sounds very AI-ish

16:20written there. Father, Laethan stopped

16:22at the foot of the dais. We need to

16:23speak about the gate. Do we? It wasn't a

16:25question. I don't think that line was in

16:27the original, and I kind of like it. A

16:29man died last night. He died on our

16:31doorstep screaming our name while we

16:32stood on the walls and watched. The

16:34words tasted like ash in his mouth. Oh,

16:36man, the number of times I've heard of

16:37words tasting like ash. You were there.

16:40You heard him. King Storr's expression

16:41did not change. It really did. The law

16:42was upheld. The gates remained shut.

16:44Order was preserved. All right, so this

16:46is not great. This It's better than the

16:48original text that is used, but better

16:52to just rewrite the scene with new

16:54prompts than to try and improve on

16:57existing writing. All right, so the next

16:59one is add headlines prompt, and let's

17:02see what Opus gave us. It gave us things

17:05like he was told the world outside the

17:07mountain was dead. He was lied to about

17:09everything. A prince thrown out to die

17:11discovers the kingdom he loved was built

17:12on a lie. First of all, these are all

17:13kind of long, and looking at Sonnet

17:16here, these look pretty long as well.

17:18They told him the world outside the

17:19mountain would kill him. They were

17:20right, but not for the reasons he was

17:21warned about. A prince, a betrayal, and

17:23a world his father made very sure he

17:25would never survive long enough to

17:27understand. He thought the monsters

17:28outside the wall were the most dangerous

17:30things in the world, then he met the

17:31humans. All right, that's fun. So, yeah,

17:33I would say these are about the same as

17:35what Opus gave me, nothing particularly

17:37groundbreaking here. And they're all

17:38kind of long. Usually headlines are

17:40better shortened. Yeah, a lot of these

17:42are really long and definitely Uh uh one

17:45thing that it did do is it kind of

17:48grouped some of these together. As noted

17:50here, headlines 4, 7, and 12 create a

17:52mystery. 3, 11, and 19 flip reader

17:55expectations. So, that was a nice little

17:57touch, but overall I wouldn't say that

17:58that's a particularly better than Opus.

18:01All right, and then we have the email

18:02newsletter prompt. I have some exciting

18:04news to share. My newest book, The Crown

18:05of Hunger, is officially releasing on

18:06December 21st, and I couldn't be more

18:08thrilled to finally get this one into

18:10your hands. A little over dramatic. This

18:12story has been living in my head for a

18:13long time, and I poured everything into

18:15it. Yeah, I I wouldn't use this myself.

18:18If we look at what Opus gave me, "I

18:21honestly can't wait for you to read it.

18:22This one's been a labor of love." Yeah,

18:24this is not much better. It might be a

18:26little I think it is a little better,

18:27but still really over the top. Last but

18:29not least, we have the SEO article super

18:31prompt where I give it a whole bunch of

18:33other articles on the web on how to

18:35write fantasy and ask it to write an

18:37article that's 4,000 words. The main

18:39thing I'm looking for here is how well

18:41did it actually stick to the 4,000 words

18:43thing because usually that's that's a

18:45number I came to specifically because

18:47that's what I'd write. So, Opus wrote

18:484,500 words. So, it exceeded my target,

18:51and Sonnet wrote 3,200 words. So, it

18:56actually did not hit the mark, although

18:57that 3,200 is still pretty beefy. I'm

19:00I'm okay with that. Let's look through

19:01this. Okay, lots of dashes. Uh Claude is

19:05particularly bad at dashes. Of course,

19:07they're all bad at dashes. But looking

19:09through this, this looks okay. Well, a

19:12lot of the problems I see with other

19:14models is that they write it almost like

19:17a just more fleshed out outline where

19:19there's not actually a whole lot of

19:20substance talking about each element.

19:22And here there is, so that's good. Yeah,

19:24I think this is a decent article. So,

19:26I'd probably give the edge to Opus just

19:27because it did exceed the 4,000 words

19:29that I asked for, but this is fine as

19:31well, honestly. All right, that's it for

19:34Sonnet 4.6. If I had to give you my

19:37initial gut reaction to this, I think

19:39it's actually pretty solid. I I might

19:41even consider swapping it out in some of

19:42my automations for areas where I'm using

19:45Opus. It is certainly not free of all of

19:48the problems that we have with AI,

19:50different AI-isms, and such, but a lot

19:53of those can be filtered out with other

19:54prompts and stuff to get rid of all of

19:56those, and I'm working on an automation

19:58that will automatically do that for

19:59people, but it's nice to not have them

20:01in the first place and not have to

20:02filter them out in the first place. But,

20:03at the very least, we've got something

20:05that's pretty decent here, and given

20:07that it's almost half the price of Opus,

20:10I would strongly consider using it a

20:12lot. Do I think it's better than Gemini

20:133? I don't know. And as I'm recording

20:16this, Gemini 3.1 just came out, so now I

20:19have to do a video on that. You'll see

20:21that probably tomorrow as you're seeing

20:23this. As this video came out, I'll

20:25probably do the the Gemini 3.1 tomorrow

20:27cuz I really do like the Gemini 3 for

20:29writing, but I do seem to be in the

20:31minority for that as I've come to find

20:34from running some tests and some polls.

20:36So, don't listen to me. Go ahead and do

20:38your own tests. See what you discover

20:40about this model, about Opus. How does

20:41it compare to Opus? And let me know in

20:43the comments below what your experience

20:45has been. I'd love to see that, and I'll

20:46see you in the next video.

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