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Anthropic

Claude Fable 5

Benchmarks, price, context and versions

Also searched as

Claude-Fable-5

Direct answer: Claude Fable 5 is a model from Anthropic. 85.9% on GPQA Diamond, per Epoch AI. On OpenRouter, US$ 10.00 per 1 million input tokens and US$ 50.00 per 1 million output tokens.

✓ Good for

  • calculation and problems with an exact answer (#9 of 186 on OTIS Mock AIME)
  • the ceiling of reasoning on research-level math (#11 of 86 on FrontierMath (tiers 1 to 3))
  • answering short facts with little invention (#8 of 87 on SimpleQA Verified)
  • agents that follow rules and use tools (#1 of 131 on τ-bench Verified (airline))
  • very long documents or code (a window of 1 million tokens or more, according to OpenRouter)

✕ Not the best for

  • when the input budget sits at the top of the table (input price in the highest 25% on OpenRouter)

This block follows a rule of this section, using source data: if the model is in the top 25% of the metric, the item goes under "Good for"; if it is in the bottom half, it goes under "Not the best for". The middle band appears in neither. Price and context use OpenRouter; scores use Epoch AI or OpenRouter Benchmarks, in the latest version we checked.

Benchmarks

GPQA Diamond

?what it is
85.9%

highest score on this metric 96.4%

70º / 198 · Epoch AI, latest version we checked

OTIS Mock AIME

?
100%

9º / 186 · Epoch AI, latest version we checked

FrontierMath (tiers 1 to 3)

?
87%

highest score on this metric 95.1%

11º / 86 · Epoch AI, latest version we checked

SimpleQA Verified

?
70.7%

highest score on this metric 94%

8º / 87 · Epoch AI, latest version we checked

GPQA Diamond (OpenRouter)

?
87.4%

highest score on this metric 96.5%

55º / 135 · OpenRouter Benchmarks, latest version we checked

Key specs

Origin
the US
Family
Claude Fable provisional data
Weights?
closed
License
no data
Input US$/1M?
US$ 10.00
Output US$/1M
US$ 50.00
Context?
1,000,000 tokens
Parameters
no data
Input
file, image, text
OpenRouter usage?
no data
Downloads (30 days)?
no data
Use cases provisional data
Text Agents
Dates in sources
  • 2026, published, per Epoch AI
  • 2026, listed on OpenRouter

Version history

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch.

FAQ

What is Claude Fable 5?

Claude Fable 5 is a model from Anthropic, with closed weights, used for text, agents.

How much does Claude Fable 5 cost?

On OpenRouter, US$ 10.00 per 1 million input tokens and US$ 50.00 per 1 million output tokens.

What is the context window of Claude Fable 5?

1,000,000 tokens, per OpenRouter.

Is Claude Fable 5 open source?

No. It is available through API only.

What is Claude Fable 5's GPQA Diamond score?

85.9% on GPQA Diamond, per Epoch AI.

Is Claude Fable 5 good for coding?

No data: there is no SWE-bench Verified measurement for it in open sources.

Who made Claude Fable 5?

It was made by Anthropic, a lab from the US.

provisional data Questions under review: Semrush had no API balance during collection. Answers use source data only.

Models from Anthropic

See lab

Anthropic does not publish weights on Hugging Face: data only via OpenRouter and Epoch AI.

Sources

  • Epoch AI, CC BY 4.0, latest version we checked.
  • OpenRouter, dados públicos da API; exports de benchmarks e rankings em CC BY 4.0, latest version we checked.
  • OpenRouter Benchmarks, CC BY 4.0, latest version we checked.

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch. Family and version were grouped by rule from the name.