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Claude Fable 5 vs GPT-5.5

Claude Fable 5 leads in 3 of 8 categories

Arena ELO

Tie

Cheaper

Claude Fable 5

Faster

Tie

Detailed Comparison

CategoryClaude Fable 5GPT-5.5
ProviderAnthropic OpenAI
Context Window1M WIN128K
Input Price ($/1M)$10 WINN/A
Output Price ($/1M)$50 WINN/A
Arena ELON/A N/A
CodingN/A N/A
ReasoningN/A N/A
Speed (tokens/sec)N/A N/A
Open SourceNo No

Frequently Asked Questions

Which has a larger context window?

Claude Fable 5 supports 1M context, while GPT-5.5 supports 128K.

Is Claude Fable 5 or GPT-5.5 open source?

Claude Fable 5 is proprietary. GPT-5.5 is proprietary.

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