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Claude Fable 5 vs GPT-5.3-Codex

GPT-5.3-Codex leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

GPT-5.3-Codex

Faster

Tie

Detailed Comparison

CategoryClaude Fable 5GPT-5.3-Codex
ProviderAnthropic OpenAI
Context Window1M WIN128K
Input Price ($/1M)$5 $1.75 WIN
Output Price ($/1M)$25 $14 WIN
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 is cheaper, Claude Fable 5 or GPT-5.3-Codex?

GPT-5.3-Codex is approximately 48% cheaper than Claude Fable 5 per million tokens.

Which has a larger context window?

Claude Fable 5 supports 1M context, while GPT-5.3-Codex supports 128K.

Is Claude Fable 5 or GPT-5.3-Codex open source?

Claude Fable 5 is proprietary. GPT-5.3-Codex is proprietary.

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