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WhichAI / Compare / Claude Fable 5 vs GPT-5.6 Sol

Claude Fable 5vsGPT-5.6 Sol

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

Claude Fable 5
GPT-5.6 Sol
Provider
Anthropic
OpenAI
AA index
62.1
58.9
Released
n/a
2026-07-09
Context
1M
1M
Price $/1M
$10 / $50
$5 / $30
Access
Claude Pro / Max plans (usage credits since July 7) · API $10/$50 per 1M tokens
Released July 9, 2026 (rolling out) · API $5/$30 per 1M tokens · up to 750 tok/s on Cerebras

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 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.

GPT-5.6 Sol: OpenAI's July flagship: max reasoning effort, programmatic tool calling and an 'ultra mode' that spins up subagents. Since GPT-6 Astra arrived at double the output price, Sol is the better-value half of OpenAI's line for agentic work.

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