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Claude 4.5 Sonnet Is Here! Better Than Opus?

The Nerdy Novelist · 4,366 words · 20 min read

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0:00Well, guess what guys? We have another

0:02Claude model to test today. Claude

0:05Sonnet 4.5. In this video, we're going

0:08to put it through all my prompts. And in

0:10particular, I have gone through and

0:13replaced a few steps in my automations,

0:17uh, which are the most powerful things

0:18that I've built to see how well Sonnet

0:214.5 does against others like, uh, Claude

0:24Opus 4.1. So, let's get into it. Uh

0:27first of all, we've got this

0:29announcement here from uh Anthropic

0:32themselves. Um there isn't really

0:34anything in here that is relevant to

0:36authors and uh creative writers.

0:40It does say right here at the beginning

0:42it says Claude Sonnet 4.5 is the best

0:44coding model in the world. Uh those are

0:47some pretty bold claims from Claude. Uh,

0:50and so I'm assuming this includes their

0:53own Claude Opus 4.1, which is a very

0:56powerful model. Uh, but if you scan

0:58through this, you'll notice, you know,

1:00it's got all of these tests and

1:01everything showing just how good it is,

1:04um, even against their own models

1:06and, uh, things like that. I don't put a

1:09whole lot of faith in a lot of these

1:11bench tests. mostly. I mean, maybe

1:14they're good for some use cases, but

1:16when it comes for writing, they don't

1:17really mean much, but um but you can

1:21tell, you know, it's a good it's a good

1:23model, right? Uh they're they're

1:26claiming it's a major upgrade. Okay, so

1:28what we're going to do today, we're

1:29going to compare it to uh well, we're

1:33I've gone through and run it through my

1:34standard prompts that I run all the

1:35models through. So, I'll give you my

1:37initial thoughts on that. I feel like a

1:39lot of those prompts are a little bit

1:41outdated these days. Uh so instead I now

1:45have uh I actually run it ran it through

1:48an automation. So this is a story I'm

1:50working on. I have the whole outline

1:52everything ready and I produced the

1:54first three chapters using Sonnet 4,

1:59Opus 4.1

2:01and Sonnet 4.5. So we're going to use

2:04this to kind of compare which one is

2:06best, but we'll get to that last. Okay.

2:09Uh, first let's go to the test prompts

2:12that I ran there. There are a couple of

2:13things here that I was really impressed

2:15with. First of all, uh, I'm going to

2:18kind of breeze through these because a

2:21lot of these are kind of just standard

2:25at this point. Like all of the models do

2:28okay on them. The log line prompts I

2:30thought were fine. U, nothing

2:32particularly groundbreaking about them.

2:36Uh, nothing that was like stood out to

2:38me like, "Oh my gosh, every single one

2:40of these ideas is a banger."

2:43Um, not not really. There were a couple

2:45of good ones in here. Um, a couple that

2:48I didn't think were as good, but I

2:49wouldn't say there's really been much

2:51improvement on this front in a while for

2:53any of the models. Um, so that might be

2:56a prompt that I need to work on. Now,

2:58the outline test prompt. This is where I

3:00give it a full outline template and a

3:02brief premise and have it just outline

3:04the whole novel. This it was working on

3:08like what it was doing was absolutely

3:10fantastic. Uh so you can see here's the

3:13prologue. Boom boom boom boom boom boom

3:15boom boom boom. There it is. That's the

3:17whole prologue. Here's chapter 1

3:21all the way until here. So this is all

3:25of chapter one here. that one chapter is

3:29like 400 words that it wrote for the

3:32summary of that. Now, um if we scroll

3:37all the way down, because I was using

3:39open router, it did kind of time out

3:41right around here at chapter 14 and um

3:46and it wrote several thousand words

3:48getting up to chapter 14. All of which

3:50were pretty lengthy and some of them

3:52even had little bits of dialogue in

3:55there. Uh, as you can see here, like

3:57you're from the mountain city, she says.

3:58It's not a question. Lean defensive. How

4:00do you know? Um, so it's like kind of

4:03going in and out of pros and summary,

4:07but

4:09uh I could have just asked it to

4:11continue and it would continue to do the

4:13whole thing for the full for the full uh

4:1540 chapters that I have in the template.

4:17But I do think that what it did manage

4:19to do here before it just kind of timed

4:21out. You can see it stopped midsentence

4:23here um was actually very very good. And

4:27I was reading through it and I was just

4:28like this is actually a decent story um

4:31compared to other things that I've seen.

4:34Is it that much better than Claude

4:36Sonnet 4 or Sonnet 3.5 or 3.7 I should

4:40say?

4:42That's that's debatable. But it's

4:44definitely not worse. Uh, in fact, I

4:47would say I would say it's it's pretty

4:49clearly a better outline so far. Uh, it

4:54certainly is more thorough, right? Uh,

4:56based on the same prompt that I've used

4:58before. Okay. Uh, beats prompt. Nothing

5:01really groundbreaking here. Pretty much

5:03all all of the models do well at the

5:05Beats. Uh, but the basic pros prompt.

5:08Let's, uh, get into this a little bit

5:10here. So, this is the prompt. I give it

5:13almost no style, direction, or anything.

5:15I just ask it to write a a couple of

5:17beats that I give it. And uh let's let's

5:21read through a little bit of this here.

5:23So, we've got the wind scream across the

5:25wasteland whipping dust and grit through

5:27the skeletal fingers of ancient stone

5:28formations that cast long shadows in the

5:30dying light. Uh I know the long shadows

5:32thing is kind of a cliche at this point

5:34with AI. Um but that's in the

5:37instructions, so that's why it's there.

5:39Dusk painted the rocky expanse and

5:41shades of blood and ash, and something

5:42else moved within those shadows.

5:43something that was not wind, not stone.

5:46Haldrid stumbled over a jutting ridge of

5:50basaltt, catching himself with scraped

5:52palms before he could fall completely.

5:54His legs burned with particular agony of

5:56muscles pushed past exhaustion, past

5:57desperation into the realm where the

5:59body moves only because the mind refuses

6:01to accept the alternative. This is

6:02actually not bad. Uh, and if we

6:05continue,

6:06um, you know, there's when the scene

6:09starts to get good, we say then he

6:11looked back. They were closer than

6:13before. Far closer. At least two dozen

6:14figures scattered across the rocky

6:16terrain behind him. Moving with that

6:18horrible jerking gate that marked them

6:20as something other than human. Something

6:21that had once been human, but now but

6:23was now only hunger given form. The gray

6:25skin barely stood out from the gray

6:27wasteland, saving save for the wrongness

6:29of their movement. The way they lurched

6:31and stuttered forward like broken

6:32puppets yanked by an impatient master.

6:35This is definitely good. Uh this is good

6:37pros. a couple of things in there that I

6:39would probably tweak to make it a little

6:41bit less dramatic, but like yeah, this

6:44is solid. Definitely a solid thing. Um,

6:47I got good results out of the more

6:49complicated prompt here. It is a little

6:51bit shorter. Um, but that could be

6:54easily remedied. Uh, the dialogue pros

6:56template, uh, the pros prompt here also

6:59was very, very good. U, nothing really

7:02there to say there. Here's one where I

7:04was a little bit impressed. So, I have

7:06this editing pros template where I give

7:07it a scene that was written by a older

7:10AI. In fact, I believe it was Claude 2

7:13that really wasn't good. Uh, you know,

7:15it's not something that I would use. And

7:16I take that scene and I give it to each

7:18of the models to see and ask it to

7:20improve on the scene to see what it

7:21does. Almost always it does not give me

7:26a good response.

7:29This is the first time where it edited

7:31the scene and I actually thought it was

7:33significantly better.

7:36So, with that in mind, uh this might be

7:40a good model to use if you are like

7:43maybe writing a quick first draft of

7:45your own and you just want to give it to

7:46the AI to see how what it can do to

7:48change it and make it better, this might

7:50be a good one for you to check out. Um

7:54because if uh just looking through this,

7:56and I won't read through all of it.

7:58You'll just have to take me at my word

8:00here that this was a really solid

8:04revision. It's not perfect. I still

8:06think if I were to like it would

8:09probably be better for me to just redo

8:11this scene using a more advanced model

8:14than to ask it to improve. But if you're

8:17doing this on your own work, like this I

8:19think actually will make a difference on

8:22your work. So that's pretty cool. Um, we

8:25got the ad headlines prompt where I ask

8:27it to take the the story concept and

8:28create some headlines that could be used

8:31on Facebook or whatever. They were all a

8:33bit long in my opinion, but they weren't

8:36necessarily bad. Uh, exiled into a

8:39wasteland of monsters and shadows, but

8:41the real horror is what he discovers

8:43about home, you know, like that's not

8:44too bad. They told him the world outside

8:46was dead. They lied. What else did they

8:48hide? Another decent one, you know.

8:51Um, so you know, they're not all

8:54winners, but you know, they're they're

8:56fine. And if I were to just ask it to

8:58make them a little bit more concise and

9:00brief, I could probably get more of what

9:01I'm looking for. Uh, I did ask for a

9:05email newsletter, and this one did okay

9:07as well. I did change the prompt for

9:09this because the prompt I was using was

9:11creating results in pretty much every

9:12model that I tested that I didn't like.

9:15So, I actually simplified the prompt a

9:16little bit. Didn't give it as much style

9:19advice. just ask it to write me a simple

9:21newsletter announcing the release of

9:24this new epic fantasy novel, right? Um

9:28and uh yeah, it's fine. It's brief. It's

9:31it's to the point and uh very little

9:34that I would actually change about it.

9:36Um at least given given the template

9:39that I gave it. But here's where I was

9:40really impressed. So I I always ask

9:44uh these new models I always test to see

9:47how it does creating an SEO article and

9:49I give it a bunch of articles as

9:51examples and then I ask it to write

9:534,000 words in this case on the topic of

9:56how to write a fantasy novel and it

9:58actually wrote uh 4,000 words

10:02and uh and they're actually pretty good.

10:05It followed the the outline exactly. It

10:07gave me like it it's really scannable as

10:10you can see here. Like we've got

10:11everything kind of uh broken up into

10:14good headings. We've got

10:17um lists here. We've got clear like

10:22everything is very clearly easily easy

10:24to find. Steps to write a fantasy novel.

10:26Identify your audience before you write

10:28a single word. Figure out what who

10:29you're writing for. This isn't about

10:31limiting your creativity. It's about

10:32making smart choices that serve your

10:34story. Are you writing for young adult

10:36readers? Then keep your protagonist

10:37between 15 and 18. Focus on the coming

10:39of age themes and aim for 70,000 to

10:41100,000 words. Writing for adult, by the

10:44way, I write young adult fantasy, and

10:46that's spot on. Writing for adults, you

10:49can explore darker themes, write longer,

10:51and assume more sophisticated reading

10:53ability. Uh, researcher target audience

10:56by and so forth. And, uh, and this is

10:59actually a pretty decent article. uh few

11:01things that I would tweak just in the

11:02language, but overall like it nailed

11:06this task and it is one of the first

11:09that has actually done so to my

11:12satisfaction. Uh especially when you

11:14like read through it and you just see

11:16how scannable it is. This is a beautiful

11:19article uh at least for AI, right?

11:22Beautiful. Very well done. So I'm very

11:24happy with this. All right. So, um that

11:27that's pretty much it for my tests and

11:29uh so let's go and actually take a look

11:31at some of the um the automations that I

11:36have here. Now, just to give you a sense

11:39for what this is, uh this is an

11:41automation that I've created. I'm going

11:43to do a whole video on this in the near

11:45future, so don't worry about that. Uh

11:47but this this automation right here is

11:50probably the best thing I've ever

11:51created. It is the most powerful tool

11:54that I currently have in my tool belt

11:57and it's how I am currently using it's

11:59what I'm currently using to write my

12:00novels. I won't walk you through

12:02everything. Uh this is available to the

12:04people in my story hacker gold group uh

12:07which there is a link down below uh if

12:09you want to play around with it

12:11yourself. So what I did is I took this

12:13thing I had it write out the first three

12:15chapters of a novella that is called the

12:18bloodline of the abyss. And uh I had it

12:22write those out three different times.

12:24One with Sonnet 4, one with Opus 4.1,

12:29and one with this latest Sonnet 4.5.

12:32Now, this is an expensive automation.

12:35And uh it has a number of steps. The

12:37main steps are these four right here.

12:40And in the past, I've been using Sonet 4

12:42for this step, uh, Opus 4.1 for this

12:45step and uh, the Gemini models for these

12:49two steps. And so what I did is I just

12:52replaced these two steps with Sonnet 4.5

12:55uh, or 4.0 depending on which test I was

12:58doing. And uh, found first of all price.

13:02Let's talk price. If we look at the

13:04input and output price for Cloud Sonnet

13:064.5, it is the same as Cloud Sonnet 4,

13:09which is approximately

13:12$3 per million tokens of input and $15

13:14per million tokens of output. For this

13:17process, uh particularly for this step

13:19right here, the first draft step,

13:22um this is where I typically have been

13:24using Opus 4.1, and that usually runs me

13:26between 70 and 80 cents for just this

13:30one step, right?

13:32uh which is pretty expensive. Uh

13:34altogether this process cost me about a

13:36dollar per chapter. So if I have a 40

13:38chapter book, it's going to cost me $40.

13:40But it when I use Sonnet for this step,

13:43it goes from being like 80 cents to more

13:46like 15 to 20 cents. So you save quite a

13:50bit of money just on this one step. And

13:53uh you know, everything still adds up to

13:55be probably uh maybe 40 cents or so. So,

14:00it's still going to cost you a fair

14:02amount to go through this whole process,

14:03but it's significantly less if you're

14:05using Sonnet 4.5 or Sonnet 4.0 for that

14:08matter. Uh, I do use Opus because it's

14:11definitely been better than Sonnet 4.0

14:13in the past. But, um, hope hopefully you

14:17get the idea. All right, so with that in

14:19mind, let's actually look at the results

14:20that I got from this. Starting with

14:22Sonnet 4, just so you can see where we

14:25were coming from. Okay. Uh, now first of

14:27all, you can probably see this already

14:29visually.

14:31You can tell that we've got just a lot

14:33of big beefy paragraphs here. And that's

14:36actually a often a sign of poor writing

14:40because it means you're just like giving

14:42us a bunch of description. It's not

14:43being broken up into uh more engaging

14:47paragraphs and sentences. There's no

14:48dialogue, that kind of thing. It's not a

14:51hard and fast rule, but I found that

14:53typically when you have like large

14:55chunks of text like this. Um, it's

14:58usually weaker writing. If we look at

15:03um, uh, the one here for Opus 4.0 or

15:064.1, it's a little bit better. Still a

15:10couple of blocks of text here. And for

15:14uh, 4.5, it's definitely broken up here.

15:17You see, like we have a paragraph here

15:18that's just one word. Another one here

15:22that's just three words. So, um, anyway,

15:25that's just something I thought I'd

15:26mention. So, let's read the first little

15:28bit here. The golden afternoon light

15:29slanted through the scriptor's narrow

15:31windows, illuminating dust moes that

15:33danced above Carmela's workt. She dipped

15:36her finest brush into the crimson

15:38pigment, the bristles holding just

15:39enough paint to trace the delicate curve

15:41of St. Agatha's lips. The saint's face

15:43emerged from the vellum page with serene

15:45acceptance. There's a little AI isn't

15:47there. Uh, just the overuse of

15:50adjectives. Her eyes fixed on something

15:51beyond the flames that consumed her

15:53flesh. Carmela's hand moved with

15:55practice precision. Each stroke a

15:57prayer. Definitely some AISMs in there.

16:00Definitely uh just kind of like

16:02overdramatic pros here. Let's look at

16:05Opus 4.1. Carmela dipped her brush into

16:08the shell of ground gold leaf. The

16:10powder flaring in the shaft of afternoon

16:11light. The saint's halo demanded more

16:12than gold. demanded a steady hand and a

16:14silent prayer with every stroke. She

16:16held her breath, the bristles barely

16:17kissing the vellum as she traced the

16:19curve where St. Agatha's serene face met

16:21the painted flames. The martyrdom filled

16:23the manuscript pages rendered in blues

16:25made from the crushed lapis and reds

16:27drawn from cineabar. Agatha's expression

16:29remained peaceful despite the painted

16:31tongues of fire looking at her bound for

16:33form. Her eyes gazed upward past the

16:35edges of the page toward a heaven,

16:36invisible but absolute. Kind of similar,

16:39definitely better though. definitely

16:41more variety and specifics in, you know,

16:45where it's talking about like crushed

16:47lapis and red's drawn from cineabar, you

16:49know, getting getting a little bit more

16:50specific, which is good. If we move on

16:54to let's actually go to the beginning of

16:56chapter 2 and actually get into

16:58something that has some dialogue. Um,

17:01so, uh, the convent bell rang its

17:03cracked dissonant tone, cutting through

17:05the morning quiet, not for prayer, for

17:06an arrival. Not a good opening sentence,

17:09right? very uh tastes a lot like AI, you

17:14know. Uh but then here with Opus, we got

17:17the bell rang wrong. Not the crack

17:18dissonant clang that had announced the

17:20refugees arrival a week ago, but a

17:22fuller sound. Bronze given his proper

17:24voice reserved for feast days and

17:26visitation. Still a little bit over the

17:27top, but there but definitely better. Um

17:32when we get to some of the dialogue

17:33here, uh we've got Father Morpheus has

17:36come. This is uh Sonet 4 again. Sister

17:39Jacella whispered as she passed

17:41Carmela's cell. Her voice dropped though

17:43no one else was near. And she made the

17:45sign of the cross. A quick affurt of

17:46gesture after she spoke his name. And

17:49then there's like not any more dialogue

17:50here for a little while. Sister Carmela,

17:53mother superior Agatha's voice had a

17:56sharp edge like splintered wood. Assist

17:58Sister Beatatrix in the guest chamber.

18:00Fresh linens to good candles. Everything

18:01must be perfect. Okay. Kind of like I

18:04don't know robotic. When we get into

18:07Opus 4.1,

18:10um, it gets a little bit better here.

18:13Uh, like we have sentences like this,

18:14which are good. The bell struck again.

18:15Three times pause. Three times pause.

18:17The pattern for distinguished v

18:18visitors. I think that was that's good.

18:21Like deep point of view there. Father

18:23Morpheus arrives today for his monthly

18:25visit. The words came quick. Each

18:26syllable sharp with something that

18:27wasn't quite excitement. You will

18:28prepare the great hall. Every surface

18:30cleaned, every candle replaced. Sister

18:31Jacella, the good wine from the seller.

18:33Sister Beatatrix, fresh linens from the

18:35head table. Sister Hilda, ensure the cap

18:37the chapel is spot spotless. And me?

18:40Carmela asked. Mother Superior's gaze

18:42fixed on her held too long. You will

18:44continue your illumination. We must show

18:45Father Morpheus that God's work

18:47continues despite difficulties.

18:50Despite the infected dying beneath our

18:52feet, the thought rose unbidden. Carmela

18:53pressed it down, nodding her nodded her

18:56obedience. So definitely like I don't

18:58know. It feels like we're in an actual

19:00scene here. We're not just being told

19:01what is happening. it it's definitely uh

19:04in a deeper point of view. All right, so

19:06with that in mind, let's take a look at

19:09what we got out of the sonnet 4.5

19:12version. Let's start with the the

19:14beginning of chapter 1, uh which goes

19:17like this. The afternoon light fell

19:18through the scriptor's narrow windows in

19:20hard geometric blocks, illuminating the

19:22dust modes that hung in the still air.

19:24Carmela bent over the tilted desk, her

19:26brush poised above the vellum where St.

19:29Agatha's face was taking shape in gold

19:30leaf and crimson. The saint's expression

19:32had to be perfect. Serene amid the

19:34flings of her martyrdom. Suffering

19:35transformed into holiness. She dipped

19:38the finest brush into the gold leaf

19:40suspension. The metallic scent sharp in

19:42her nostrils. There's a little bit of an

19:43AISM there. The stroke had to be steady,

19:46confident. One tremor would ruin hours

19:48of work. She touched the brush to the

19:49saint's cheek, drawing a thin line that

19:51caught the light and seemed to glow from

19:53within. Beautiful. All right, let's go

19:56to that scene here in chapter two.

20:01Um,

20:02footsteps in the corridor outside.

20:04Sister Hilda's voice was a high,

20:05breathless thing. He's coming today.

20:07Mother Superior just announced it.

20:08Carmela's head lifted. The door to her

20:10cell burst open without a knock. Did you

20:12hear? Sister Hilda's round face was

20:13flush. Father Morpheus arrives this

20:15evening. We're preparing the chapel in

20:16the courtyard. The name was a cold stone

20:18dropping into her gut. She'd met the

20:20bishop only three times in her years

20:21here. Brief encounters after confession.

20:23His benediction at meals. Each time

20:25she'd felt a strange unease as standing

20:27too close to a cliff's edge in fog. I

20:30heard Carmela stood brushing dust from

20:31her habits hem. Has mother superior

20:33given instructions. Everything the

20:35finest candles in the uh chapel the

20:37courtyard sweat. The linens changed in

20:39the guest quarters. Sister Hilda grabbed

20:41her hand pulling her toward the door.

20:43Come. There's so much to do. So this is

20:45actually not too bad either. And

20:48honestly,

20:49I find it a little bit difficult to

20:52distinguish between Opus 4.1 and Sonnet

20:554.5. I think I need to uh play around

20:58with them a little bit more, get a

21:00little bit more of a sense of like which

21:02one is better for me. But I will say

21:05this, it is 100% way better than Sonnet

21:094. Like like way better. So, if you are

21:15using Sonnet 4 at any part of your

21:16process, I would strongly recommend

21:18upgrading to 4.5. I'm pretty sure in

21:21almost in most of the instances, you are

21:24likely to get better results out of

21:26Sonnet 4.5 than Sonnet 4. What I'm

21:30interested in is can we get better

21:31results than Opus 4.1

21:34which for creative writing uh has been

21:37my favorite recently

21:40and it's still really good and it's

21:42really hard to tell which one has the

21:44edge. I think having read through a

21:46little bit more of this before I started

21:48uh filming this video, I think I still

21:52give the edge a little bit to Opus 4.1.

21:54I think it's still just a little bit

21:56better. like the language is more

21:58diverse, if that makes sense. It's it

22:00just it feels more lived in, more human.

22:05Uh it feels like it was actually like

22:07the scene was reasoned out by uh in a

22:11more human way rather than just sort of

22:13like robotically producing words that

22:15match your outline, right? It feels like

22:17there's more thinking going on. That's

22:19the only way I can describe it.

22:22But Son of 4.5 is very, very close. And

22:26if you're concerned about price, um,

22:29like with my automation costing me a

22:31dollar per chapter,

22:34it might be worth it to go with Sonnet

22:364.5 just for the savings I'll make by

22:38converting it from Opus 4.1 to to Sonet

22:414.5. Um, but is it better? It's it's

22:46close, but I don't think it's quite as

22:49good as Opus 4.1. Uh maybe when we get

22:52Opus 4.5 that that will be a clear

22:54improvement, but um overall definitely a

22:59solid model. Uh definitely better than

23:02Sonnet 4. So go ahead and make all of

23:05those upgrades. Um I even found that

23:07Sonnet 4 was not as good at Sonnet 3.7

23:11in some specific use cases. Uh like with

23:15writing articles, for example.

23:18In this case, this one's definitely

23:20better uh at writing articles. And so,

23:23I'd be happy to convert some of those

23:26things over to Sonet 4.5 as well for

23:29some of my automations and things.

23:31Overall, I think this is just a very

23:33solid model. It's definitely one I

23:34recommend you check out. Try it for your

23:36writing. You're definitely going to get

23:37good results for your writing. Are they

23:40going to be better than 4.1 Opus? I

23:41think that might be a matter of taste. I

23:43think Opus might just be a smidgen

23:45better, but it is an expensive model. Uh

23:48so deal, you know, deal with that how

23:50you will. Uh hopefully this has been

23:53useful for you. And if you want to get

23:55access to this automation that I talked

23:57about, go ahead and check out my link

23:58down below to join the gold group. We

24:01are on a u a wait list right now, but uh

24:06if if you don't see it open, I'm sure we

24:09could probably get you in at some point

24:10in the near future. So go ahead and

24:12check that out and I will see you

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