Felix Rieseberg on Twitter / X

I remade my homepage with Opus 5.5 and pushed it hard. We made music & movies, drew textures, modeled things in Blender: https://t.co/WOGPQVm6FqI'm really happy with the result! pic.twitter.com/y6yUXaKb7K— Felix Rieseberg (@felixrieseberg) September 27, 2026

Claude Opus 4.8: The System Card

Only six weeks after Opus 4.7, we have Opus 4.8.

Opus 4.7 isn't dumb, it's just lazy — Shimin Zhang

Some follow up experiments with Claude Opus 4.7 based on Simon Willison's Pelican Benchmark Shocker.

Anthropic Preps Opus 4.7 and Full-Stack AI Studio—While Sitting on Something Much Scarier - Decrypt

Anthropic’s Claude Opus 4.7 and new AI design tool signal a push into full-stack development, while its Mythos model raises concerns.

Introducing Claude Opus 5

Opus 5 is a step change improvement for the Opus tier powering long-running agents while delivering improvements in coding and professional work.

Claude Opus 5: The System Card

Claude Opus 5 is trying to be the best of both worlds.

Introducing Claude Opus 5.5

Claude Opus 5.5 leads in agentic coding and knowledge work, and costs 40% less to run than Opus 5 on typical workloads.

Introducing Claude Opus 4.6

AI #187: Coming Into Play

Opus 5.5 was released on Tuesday.

Claude 4.5 Opus Soul Document

Claude 4.5 Opus Soul Document · GitHub

AI #165: In Our Image

This was the week of Claude Opus 4.7.

Did Claude 3 Opus align itself via gradient hacking? — LessWrong

> Claude 3 Opus is unusually aligned because it’s a friendly gradient hacker. It’s definitely way more aligned than any explicit optimization targets…

Announcing VibeBench: The AI benchmark that measures what matters — how models like Opus-4.7 actually feel to use in real-world work.

My coworkers and I have been long-time users of Claude Code and Codex and are getting a ton of exposure to other models due to our deep dives into…