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Anthropic

Claude Opus 5.5

The newest Opus, at the same price as Opus 5.

Claude on AnyModel runs through the official Anthropic API and through AWS. The model weights are the same as in claude.ai. Answers can differ because the Claude app adds its own system prompt, tools and extended thinking to every request. Through the API the model receives only your request. More in the FAQ

Claude Opus 5.5 is Anthropic's newest flagship for sustained coding, multi-file work, multi-agent coordination and precise code review. It costs the same here as Opus 5, so moving up a generation changes nothing on the bill.

Best for

Hardest coding tasksMulti-agent workCode review

Strengths

  • ▸Newest Opus
  • ▸Agentic coding
  • ▸Adaptive effort up to max

Use Claude Opus 5.5 via AnyModel

One OpenAI-compatible endpoint — just set the model id:

curl https://anymodel.org/v1/chat/completions \
  -H "Authorization: Bearer $ANYMODEL_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-opus-5-5",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
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