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Claude Fable 5.1 — and what?

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 1 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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Claude Fable 5.1
anthropic/claude-fable-5.1
Provider
Anthropic
Family
Modality
text
Context window
1,000,000 tok
Max output
128,000 tok
Released
2026-09-01
License
Proprietary
Input price
$10.00 /1M
Output price
$50.00 /1M
Tools
yes
Streaming
yes
Vision
yes
JSON mode
yes
Reasoning
—
Prompt caching
—
Batch API
—
Try it
Open in playground →
Claude Fable 5.1
anthropic/claude-fable-5.1
Full spec →

Claude Fable 5.1 is Anthropic's next model in the Fable family, with improvements in agentic coding, long-running agentic workflows, knowledge work, front-end and visual code generation, and finance and analysis tasks. It supports adaptive thinking and a 1M token context window.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows