Learning to create with Claude Opus 5.5 connected to the magnificent MCP.
In 5 minutes I had my own character builder. Look ↓
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
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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.
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