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Anthropic

Claude Fable 5.1

The current Fable — the newest model of Anthropic's Claude 5 family.

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 Fable 5.1 is the newest release of Anthropic's Fable line, the Mythos-class tier above Opus. Same 1M-token window and the same premium rate as Fable 5, served through our relay capacity.

Best for

Hardest problemsAgentsHigh-stakes output

Strengths

  • ▸Above-Opus capability
  • ▸Newest Fable release
  • ▸1M-token context

Use Claude Fable 5.1 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-fable-5-1",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
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