Introducing Claude Opus 5.5! 40% lower cost than Opus 5 with cache reads 60% cheaper. It performs at the level of Claude Fable 5.1 for most tasks. I celebrated with a pelican riding a bike in Three.js.

Opus 5.5 is a big step up from Opus 5. This is a great model for agentic coding and computer use. Learn more:

Opus 5.5 writes and communicates much more naturally and follows the writing rules you give it more closely. Glad to see these improvements over Opus 5:

🥲

Banger

🙏 Hope folks enjoy the model!

I’ll take those cheaper cache reads thanks!

Fantastic. Hope they help!

I am so glad I banked a bunch of tokens this month

Enjoy and do let us know if you have any feedback! 🫶

This looks incredible. One-shot prompt?

This was one-shot :) I love this model!

One-shot?! Insane. Was the scene detail (lighting, city, physics) in your prompt too?

You joined Anthropic and released a new model. Congratulations 🎉

Big team effort! 🎉 It's a great model and hope folks enjoy it (and share feedback where we can do better)!

its really amazing, cheaper and more powerful at the same time compared to previous opus series models

Repo for the pelican?

I'll be repro'ing with our public harness soon :)

That's fantastic

🫶

60% cheaper cache reads is the line, the pelican's just the mascot at this point

Banked Reset + Pelican 3js The addy fever is here !!!

Time to play! :) Hope folks enjoy 5.5!

Wow this is insane

It's a good model 🙂

totally agree, we're so back. sad being stuck on fable 5.1 since opus 5 couldn't write readable text even with custom instructions and output style… 5.5 feels natural. finally opus as my daily driver. (feels like the opus 4.5 jump, some of people know what i mean)

happy to hear 5.5's communication style feels more natural. some great work by @JacksonKernion and team

Is it actually playable or a rendered sequence?

playable three.js game :)

@techgirl1908 Thank you deepseek and kimi

Looks like my own pelican is gonna have to go for a ride today

Looking forward to it!

opus 5.5 medium beats opus 5 max in cursorbench wondering which tasks still need max now

This is an incredible mix of high performance and low cost.

Congrats! Do you happen to know if I sign up for Max now, do I get the banked reset? Or only for existing subscribers? :)

Yeah

价格和能力一起往下走 这才是普通人用得起的进步 以后加班前先把活丢给它跑

What was/were the prompt(s) to build this? I don't get anywhere close the demos people keep posting using Fable... 😅

On Opus 5.5: ~ "I want you to create a very detailed 3D game of a pelican riding a bicycle around a city. It should be almost hyper-realistic, self-contained and have music and effects" gets you far. I followed up with camera angle prompts to refine it.

Probably benchmark leakage at this point. A new test is needed

Is this demo fr fr?

really cool test, we had a similar idea and opus 5.5 create the famous pelican, but with the classic scenery

That's very cool demo... The best Pelican test I've seen so far.

Oh wow, 🤩

Yey! Three.js retired because of AI, anyways.

Lower cost helps, but the real gain is in the feedback loop: faster experiments, better tests, and more time for the hard product decisions.

That pelican demo is perfect. Cheaper cache plus Fable-level perf sounds dreamy. 🐦

i just saw a guy order a burger with extra cheese and free fries at 11:47 pm

The pelican 😂😂😂

pelican on a bike is simon willison's benchmark, and everyone borrows it on launch day