This video was made with Claude Opus 5.5 and goes to show what TestMu AI does.
Launched by Anthropic on September 22, 2026, Opus 5.5 is what the company calls "the strongest-performing model we've tested to date" built for agentic coding, knowledge work, computer use and
Opus 5.5 vs. GPT-6 Astra
Link:
5 powerful new websites
Helps you test your docs against the Agent-Friendly Documentation Spec. is a local-first observability for AI coding agents. is the cleanest ASCII art visuals generator.
Opus 5, street fighter mixed with tekken, one shot.
On par with Fable, ahead of every other model I've run. No visual defects on the first pass, and the game balancing feels right. works w my stick 2
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All of Claude Opus 5