WhichAI / Compare / Claude Opus 5 vs Claude Fable 5

Claude Opus 5vsClaude Fable 5

Claude Opus 5 scores higher on the September 8, 2026 index. Full context below: price, context window, strengths and honest limits. Verified September 8, 2026.

Claude Opus 5

Claude Fable 5

Provider

AA index

62.1

Released

2026-07-24

n/a

Context

Price $/1M

$5 / $25

$10 / $50

Access

Released July 24, 2026 · Claude Pro / Max plans · API $5/$25 per 1M tokens (Fast mode $10/$50)

Claude Pro / Max plans (usage credits since July 7) · API $10/$50 per 1M tokens

n/a = not published or not yet verified. Scores marked ~ are WhichAI estimates and should not be compared 1:1 with measured scores.

In one line each

Claude Opus 5: Anthropic's July flagship: 1M context, thinking on by default, computer use, and the Agentic Index lead, at unchanged Opus pricing. The default choice for long agentic runs where you want one model to hold the whole task.

Claude Fable 5: Anthropic's newest flagship (Mythos-class) - tops the AA index at max effort and leads creative-writing boards for voice, subtext and character work; briefly export-controlled, now globally available.

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