WhichAI / Models / Claude Fable 5.1

Claude Fable 5.1

· verified October 14, 2026

public paid api in Generator writing reasoning coding agents vision

Provider

Statuspublic

AA Intelligence Index53.4 (official, read October 14, 2026)

Released2026-09-01

Context window1M

ModalitiesText + image + files

API price $/1M (in / out)$10 / $50 · $0.25 per 1M cached input, 75% cheaper than 5.0 · 128K max output

Speedn/a

AccessReleased September 1, 2026 · Claude Pro and Max · API $10/$50 per 1M tokens ($0.25 cached)

In one line

The highest measured score on this table. Anthropic's September refresh keeps Fable's purpose-built creative-writing strength and adds the thing that actually changes budgets: cache reads at a quarter of the old price, which makes long-document and repeated-context work roughly four times cheaper to run.

Coding92

Reasoning94

Writing97

Agents & tools92

Category scores (0-100) are WhichAI blended ratings: public category leaderboards plus editorial judgment. Guidance, not official measurements.

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Artificial Analysis Intelligence Index, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 14, 2026. 209 models carry a current official measurement. A value marked ~ is converted from an earlier snapshot because no current measurement is published; an unmeasured model is never ranked. Context, price, modality and listing dates come from the public OpenRouter model list (refreshed automatically on the live site; static copy retrieved October 3, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (the Ranking chapter and About > Methodology).