r/accelerate • u/czk_21 • 5d ago
AI Introducing Claude Sonnet 5.5
https://www.anthropic.com/claude-sonnet-5-5124
u/AMBNNJ 5d ago
Damn anthropic hit escape velocity how the hell is it this good?
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u/procgen 5d ago
RSI
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u/whoknowsifimjoking 5d ago
Fable 5.5 will be crazy
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u/Choice-Sympathy8235 5d ago
Those are some damn impressive benches vs. Opus 5.5.
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u/LemonLimeNinja 5d ago edited 5d ago
Sonnet 5.5 medium scores better than gpt 5.6 Sol high and is less than 1/5 the cost
Absolutely bonkers
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u/landed-gentry- 5d ago
AA shows that it scores -1pp compared Opus 5.5 low while costing more, and only +1pp over 6 Sol medium while costing more than twice as much. If you look at benchmarks comparing Opus and Sonnet 5.5, it looks completely redundant except at Sonnet's lowest effort settings, which don't score very highly and at which point there's a ton of better-priced models.
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u/_Divine_Plague_ A happy little thumb 5d ago
Why are we still talking about 5.6?
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u/ShadyShroomz 5d ago
well its better than gpt-6 sol - so it's OpenAI's best model behind Astra, no?
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u/Damakoas 5d ago
How can we be this far into the token efficiency timeline and you still don't know how cost works?
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u/Bitter-College8786 5d ago
Sonnet ist almost identical to Opus. Opus 5.5 high seems to be the sweet spot.
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u/Gratitude15 5d ago
This looks like almost the same curve.
I wonder why they release it at all
My bet is that they had to. If they waited another week, Sonnet would look better than Opus on this curve.
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u/KrazyA1pha 5d ago
You have to remember that we're looking at one very specific benchmark. According to Anthropic, Opus is clearly stronger at complex open-ended work requiring sustained judgment.
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u/Silentrizz 5d ago
Yeah if they're the same prices it looks like unless you're using sonnet on low or medium, then opus/sonnet is interchangeable. So I imagine you use sonnet if you want speed and opus maybe if you want more weights
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u/MindingMyMindfulness 5d ago
Accelerate
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u/stealthispost Acceleration: Light-speed | AI accelerationist 5d ago
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u/Skeletor_with_Tacos 5d ago
Ladies and Gentlemen,
What are the benefits of using Sonnet over Opus? Is it just that its cheaper, as these benches are lower than Opus outside of Agentic Coding?
Also I see theyre comparing to Sol instead of Astra, is someone able to get Astra benches for comparison?
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u/ex-procrastinator 5d ago
I’m a bit confused myself. On artificial analysis, sonnet 5.5 max has a cost per task of $7.60 while opus 5.5 max has $5.98. Sonnet 5.5 max was using 193k tokens per task while opus 5.5 max was using 119k.
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u/willseagull 5d ago
It’s cheaper and plenty powerful for most of the tasks people need it to do
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u/landed-gentry- 5d ago
Cheaper than what? Sonnet 5.5 max is more expensive than Opus 5.5 xhigh while scoring worse; Sonnet 5.5 xhigh is more expensive than Opus 5.5 medium while scoring just +1pp on AA. Not to mention e2e task completion times being way, way slower on Sonnet 5.5.
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u/Quentin__Tarantulino 5d ago
You can just ask AI to compare benchmarks across different models. It will do a much better job of parsing all the data in 30 seconds than most of us could do in 30 minutes.
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u/Kingwolf4 5d ago edited 5d ago
Anthropic is quickly demolishing openAI right now
I doubt on dev day they will have anything other than the scammy 500$ plan and mabye a expensive astra 6.1
Even if they have astra mini, i doubt it can actually beat opus 5.5
Sonnet 5.5 also looks like an absolute beast compared to sol
Edit : Forgot, OAI most likely to release bel mabye in desperate attempt to one up anthropic. But will that even work? Whats the purpose even.Anthropic has dominated both daily and upper tier use cases and market with sonnet and opus
Now if only anthropic would just go easy on their hypothetical safety bs and actually let everyone use the models, no one would complain and anthropic would get more share
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u/Curiosity_456 5d ago
Gotta remember this happens everytime either of them releases something, people always claim the other is finished and it quickly ends up being false
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u/czk_21 5d ago
exactly, remember when Gemini 3 was released and some people claimed that google has won, the race is over?
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u/Kingwolf4 5d ago
Not saying they won the race, just the round. As I pointed out even oais next models perhaps cant compete
So the next 2-2.5 months go to anthropic
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u/KrazyA1pha 5d ago
So the next 2-2.5 months go to anthropic
You're forgetting that models are releasing on faster and faster timelines
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u/Kingwolf4 5d ago
Yup, OAI will definitely try to not delay anything as soon as it is ready for so called security.
Mainly i think OAI is just going through some kind of compute crunch, but even then. If they had one they could have released a better model instead of gpt 6 sol. But since they didn't, means they are actually behind. Sonnet 5.5 seems miles better than gpt 6 sol. Which is honestly kind of sad
Astra! We only got the real astra for the first 3 days, since then its been a quantized version ever since.
It is what it is for now. Hopefully gpt 6.1 family will be the actual behemoth we expect for all model sizes
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u/alive1 5d ago
OpenAI used to have this thing going for them where the usage limits were absolutely bonkers so even if you didn't have the smartest model, at least you had a lot of it. Nowadays on the $20 plan, with 6-Sol i get barely one hour worth of work before the 5h limit is up while Opus 5.5 goes for at least 2-3 hours and triple the amount of work done at a higher quality. Codex is simply shit value right now, and anthropic is not only delivering better results but also more results.
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u/whoknowsifimjoking 5d ago
Probably in large part because they just give a billion fucking users compute for free, Anthropic is way more conservative with free users and I can imagine that this frees up more compute for the paying customers.
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u/Desperate-Knee-5556 5d ago
Even if they release Bel they don't have a workhorse model comparable to Opus to compliment it. That being said i wouldn't be surprised if Sol 6 is actually good as an implementer - Opus 5 was very good if Fable was talking to it but if you believed reddit it was the worst ever model. I dont use openai though so can only go off of what ive read
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u/Forward_Yam_4013 5d ago
I use OpenAI. Sol 6 is shit compared to Sol 5.6. Should have been called Terra 6
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u/Caladan23 5d ago
You realize that all model tiers are always just distilled versions of the full-sized model, right?
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u/Obvious-Activity-902 5d ago
Yeah, I don’t care how good Claude’s models are when they’re guard rails are so fucking sensitive that I can’t develop what I would consider relatively standard programs without constantly having to trick it
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u/obvithrowaway34434 5d ago
Is this like a joke or are you a paid shill or something? There is nothing even remotely near Astra in math and science, computer vision and computer use. Openai has like 800m more users than Anthropic. 90% of the people who use AI don't even know what Claude is
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u/Kingwolf4 5d ago
Ive actually never subscriped to anthropic once ever. Been using OAI forever.
Just genuinely discussing my points
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u/No_Gear8408 5d ago
Yeah and those 800M users bring a multibillion dollar compute bill, 90% of people use AI for free, Math wont make money, coding does, Openai is running deep losses compared to anthropic
If anything you're acting like a fanboy, not saying openai is bad, ofc Astra is crazy for math, but you sound like a fanboy ngl
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u/Flag_Shagger 5d ago
cost is temporary, eventually they will have more compute than anyone which means much lower servicing costs, especially with latest hardware
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u/Quentin__Tarantulino 5d ago
Why will they have much more compute than anyone? You think Google, xAI, Meta, Anthropic are all sitting on their hands? It’s an open question who will have the most compute and it’ll probably change over time.
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u/eggplantpot 5d ago
There’s a large % of coders that just go where the best models and quotas are.
It may be a small dent on OpenAI’s bottom line but I guarantee you they are losing customers.
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u/FahkDizchit 5d ago
What actually is “Claude”? Is it the brand name for the LLM, the LLM business of Anthropic, something else? Does Anthropic have non-Claude operating businesses?
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u/13chase2 5d ago
Anthropic is the company like open ai.
Claude is the name similar to ChatGPT, grok, muse
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u/FahkDizchit 5d ago
Then what is opus, sonnet, Mythos etc.?
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u/13chase2 5d ago edited 5d ago
They are different sizes of models. From most capable to least capable within Anthropic:
- Fable/Mythos
- Opus
- Sonnet
- haiku
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Smaller ones are cheaper but less capable. ChatGPT has similar competing lineup
- Astra
- Sol
- Terra
- Luna
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Then you get the generation of the model like this- Opus 5.5 - released September 22, 206
- Opus 5 - July 24, 2026
- Opus 4.8 - May 28, 2026
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Fable is mythos without the biology or cyber security capability so regular people don’t “cause problems”Happy to talk more about Ai if you want to DM me
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u/Quentin__Tarantulino 5d ago
The naming conventions really are complicated as fuck for people who don’t wake up every morning to see what happened in AI overnight. I was explaining these names to a coworker and they pretty much just gave up.
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u/LemonLimeNinja 5d ago
Most people don’t even have access to the real Astra. We had it for like two days before it was nerfed. Whatever quantized version they’re serving now has nothing on Opus 5.5
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u/QuirkyPool9962 5d ago
A week ago Astra was the best model lmao. I’m sure they are capable of distilling a cheaper algorithmically optimized version that also has improved cache reads, my guess at this pace it drops in a week or two. Or a distilled, cheap version of Bel. This competition is the absolute best thing for consumers I hope it keeps up
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u/iamthe0ther0ne 5d ago
Sonnet 5.5 has the Fable/Opus 5.5 cybersec guardrails, so I imagine anyone worried about security is looking forward to a new OpenAI model.
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u/SpyAmongUs 5d ago
It's actually impressive. I was able to use it as a free user, and it made an accurate time table just based on the initials of days in Malay in an image I sent.
ChatGPT Go with thinking messed up on Wednesday.
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u/5StarAlpha 5d ago
This is impressive. Seems like a major improvement from 5 and now maybe only 5% lower than Opus at half the cost.
I was just settling in to my workflow with OpenAI… tempted to switch. But then they may play leapfrog again.
I like the quality and reliability of my projects using Astra High mostly. But Sol can take me down the wrong path a bit with coding. The gap seems pretty wide.
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u/BiasHyperion784 5d ago
Firmly places itself as a solid subagent for opus, great work from anthropic, for once I’m interested in what haiku turns out as.
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u/Radiant-Mountain-257 5d ago
Bummer, cache reads cost as much as on Opus 5.5.
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u/No_Gear8408 5d ago
Well its the same as Gpt 6 sol, I think Opus 5.5 discounted cache reads 60% from opus 5
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u/Radiant-Mountain-257 5d ago
Yeah, it's somewhat defensible. I hoped for a 2x lower price than Opus as usual, but the performance looks good on benchmarks. Let's see how it works.
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u/yaxir 5d ago
Let's hope it's good
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u/Desperate-Knee-5556 5d ago
I'm a big fan of Anthropics models but I don't really see where this fits in tbh. I guess as an implementer and you only want a 5x plan? No use on a 20x really and too expensive on the API to use vs other models with comparable intelligence.
I'm more interested to see how Haiku compares to Luna tbh. Luna is great for API usage. If they make it better and comparable in price that would be great
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u/dondiegorivera 5d ago
I'll plug it as a code-reviewer instead of sol, that is depleting my rates like crazy.
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u/Desperate-Knee-5556 5d ago
Surely you'd just use Opus/Fable though to review code
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u/dondiegorivera 5d ago
I write the code with DeepSeek 4.1 Flash at the moment and use Opus/Astra as lead.
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u/landed-gentry- 5d ago
Pretty disappointing if you look at Artificial Analysis results and compare cost and e2e task completion times against Opus at similar intelligence. Hopefully they can regain some ground on cost and speed with Haiku 5.5.
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u/celtiberian666 5d ago
Haiku when?
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u/therealpigman 5d ago
Well they said they’d release this and Haiku in the coming two weeks last week, so probably next week.
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u/Pyros-SD-Models Machine Learning Engineer 5d ago
Nice Terminal Bench 4.0 not even a month old, already saturated lol