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Claude Opus 5.5
Anthropic's first Claude 5.5 model. Fable-level on most work, about 40% cheaper than Opus 5. API id claude-opus-5-5.
Related builds
Stickman (Opus 5.5)
Stickman fighter with character customization and skills. One HTML file from Opus 5.5. Playable.
netherspace
Low-effort platformer. An AI agent wakes up and reveals the world as he solves queries. Claude Opus 5.5.
Claude Fable 5.1
Anthropic's public Mythos-class model. Long-horizon coding and research, cheaper cache reads. Live everywhere today.
Merge Agent Handler
An agent built with Claude, GitHub and Notion that finds recently merged PRs, summarizes what shipped, and posts a fresh digest to Notion every Monday.
