Opus

one Opus 5.5 prompt, and now I run around a virtual office managing agents to work on github issues and merge conflicts https://t.co/7j6Qs1G8eL

@webdevcody·Sep 26, 2026↗

Bury your head in the ground at your own risk. I aim to not jump on any hype trains, but since Opus 4.6 and GPT-5.2 + the harnesses it was clear that these things can write code nearly as good as I c…

@GergelyOrosz·Sep 25, 2026↗

I had high hopes for the new Opus release. It massively exceeded them. Opus 5.5 is an incredible model. https://t.co/pvidNTSlsF

@theo·Sep 24, 2026↗

Everyone is tired of reading AI slop. Anthropic says Opus 5.5 writes more naturally and actually follows instructions, so we ran an eval. We tested it against the new versions of OpenAI's GPT-6 Luna…

@braintrust·Sep 23, 2026↗

holy shit, opus 5.5 is kind of insane at animation. i didn't write a single line of code. it wrote the story, drew every frame, and made the music. no image assets at all, it's all JS. the story is …

@Voxyz_ai·Sep 23, 2026↗

opus 5.5, animated pixel art wizard, pure code prompt shared below 👇 https://t.co/OfHFZmjxtc

@majidmanzarpour·Sep 23, 2026↗

Opus 5.5 is way, way, way better than Opus 5. Sorry about that model, please try this one.

@__nmca__·Sep 23, 2026↗

I asked Opus 5.5 to try a bunch of redesigns of my personal website using my MAX sub, using workflows to iterate and critique. I was really pleased with how it hit the tone I was looking for. Then…

@trq212·Sep 22, 2026↗

I was invited to test Opus 5.5. The differences at the high end are hard to notice unless you're being ambitious. They reward ambition though. If you can't tell the difference here, or if you're i…

@steveruizok·Sep 22, 2026↗

Claude Opus 5.5 is the best LLM for Operations we've benchmarked. It scored 40% on @Zapier's AutomationBench: 657 of the hardest real business workflows we have, across 6 departments. It excelled …

@wadefoster·Sep 22, 2026↗

opus 5.5 = personality of opus 4.6 that we all *desperately* wanted back + the intelligence & taste of fable 5.1. and a 25% usage bump! i honestly don’t really see a reason to use another model…

@mckaywrigley·Sep 22, 2026↗

Opus 5.5 is here! 🎉 It's honestly such a nice model to work with. Feels like Fable, but ~30% faster and ~40% cheaper per task than Opus 5. Go try it out! https://t.co/zwo83sbgez

@lydiahallie·Sep 22, 2026↗

I asked Opus 5.5 to make a game inspired by the discovery of the first computer, the Antikythera mechanism. Everything you see and hear is procedurally generated in real time, from code by Opus 5.5.…

@edwinarbus·Sep 22, 2026↗

Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5. https://t.co/Q9C2VKQ79f

@claudeai·Sep 22, 2026↗

Fable 5.1 + Opus 5 https://t.co/ZSniEnMZHx

@EvanMilenko·Sep 4, 2026↗

🚰 SYSTEM PROMPT LEAK 🚰 Here's the Fable 5.1 system prompt!! 🙌 Coming in at a WHOPPING 270,000+ characters, this prompt is definitely on the longer side. There have been a handful of notable edit…

@elder_plinius·Sep 1, 2026↗

I made Claude compete against itself. The smartest model does not automatically make the best agent. To prove it, I took the same Opus 4.6 model, initial prompt, and empty repo and but it inside two…

@MilksandMatcha·Aug 25, 2026↗

I got 96.2% on ARC-AGI-3 with Opus 5, and 99.3% pass@2. The program is basically Claude Code + Opus 5 (high), one action command, and filesystem logs. Almost nothing ARC specific. https://t.co/NHyib…

@jeremyberman·Aug 12, 2026↗

I gave Opus 5 a dataset of every certified running streak (including my own) and told it to use D3 to make a striking data visualization. It made an interactive global map, lifespan running graph, s…

@leeknowlton·Aug 4, 2026↗

Introducing Modern Claudefare Built fully with Opus 5 on High Mode over a few days using principles from @mattshumer_’s Gauntlet Loop - 84,100 lines of code Includes remakes of 4 beloved maps: 0:00…

@0xRishi·Aug 3, 2026↗

My Opus 5 video is late, but that ended up being good because I would have made a very different video on release day I really like the idea of this model, but actually using it kinda sucks... https…

@davis7·Aug 1, 2026↗

Thought I'd try getting Opus 5 to build a Kart racing game after seeing what @mattshumer_ did. Still drops some frames but this is amazing what was competed just yesterday! Everything drawn from sc…

@Ryancampbell·Jul 29, 2026↗

Why Software Factories Fail: Benchmarking the new frontier This is a continuation of Parts 1 and 2 of "Why Software Factories Fail" - [Part 1: the harness is not enough](https://x.com/dexhorthy/sta…

@dexhorthy·Jul 27, 2026↗

I've already had to update the guide to which AI models to use that I wrote on Thursday to include Opus 5 and Codex's voice mode, both of which are significant & launched on Friday. Keeping up is…

@emollick·Jul 26, 2026↗