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Claude Opus 4.8 vs GPT-5.5

Claude Opus 4.8 leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

Tie

Faster

Tie

Detailed Comparison

CategoryClaude Opus 4.8GPT-5.5
ProviderAnthropic OpenAI
Context Window200K WIN128K
Input Price ($/1M)$5 $5
Output Price ($/1M)$25 WIN$30
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 Opus 4.8 or GPT-5.5?

Claude Opus 4.8 is approximately 14% cheaper than GPT-5.5 per million tokens.

Which has a larger context window?

Claude Opus 4.8 supports 200K context, while GPT-5.5 supports 128K.

Is Claude Opus 4.8 or GPT-5.5 open source?

Claude Opus 4.8 is proprietary. GPT-5.5 is proprietary.

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