WhichAI / Models / Claude Fable 5.1

Claude Fable 5.1

· verified September 8, 2026

public paid api in Generator writing reasoning coding agents vision

Provider

Statuspublic

AA Intelligence Index65.7 (September 8, 2026 snapshot)

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.

Alternatives worth a look

Claude Opus 5 (Anthropic) · AA 63Released July 24, 2026 · Claude Pro / Max plans · API $5/$25 per 1M tokens (Fast mode $10/$50)
Claude Fable 5 (Anthropic) · AA 62.1Claude Pro / Max plans (usage credits since July 7) · API $10/$50 per 1M tokens
Muse Spark 1.3 (Meta) · AA 62.1Released September 2, 2026 · API $1.25/$4.25 per 1M tokens · Contributor tier $0.10/$0.20

Open Claude's official app ↗ Open in the WhichAI app Not sure? Take the 30-second finder

Artificial Analysis Intelligence Index, 2026 rebased scale (top models ~ 55-66). Snapshot: September 4, 2026 (BenchLM mirror), retrieved September 8, 2026. Specs and prices come from the OpenRouter public model list on the same date. Models nobody has measured carry no index score at all and never enter a ranking: where an estimate exists it is shown separately and labelled unmeasured. Context, price, modality and release dates come from the public OpenRouter model list (retrieved September 8, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (Model guide and About > Methodology).