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Claude Opus 4.6 vs GPT-5.5

Claude Opus 4.6 leads in 4 of 8 categories

Arena ELO

Claude Opus 4.6

Cheaper

Tie

Faster

Claude Opus 4.6

Detailed Comparison

CategoryClaude Opus 4.6GPT-5.5
ProviderAnthropic OpenAI
Context Window1M WIN128K
Input Price ($/1M)$5 $5
Output Price ($/1M)$25 WIN$30
Arena ELO1549 WINN/A
Coding80.8% SWE-bench N/A
Reasoning65.4% Terminal-Bench N/A
Speed (tokens/sec)~40 t/s WINN/A
Open SourceNo No

Frequently Asked Questions

Which is cheaper, Claude Opus 4.6 or GPT-5.5?

Claude Opus 4.6 is approximately 14% cheaper than GPT-5.5 per million tokens.

Which is better for coding, Claude Opus 4.6 or GPT-5.5?

Claude Opus 4.6 scores 80.8% SWE-bench on coding benchmarks, while GPT-5.5 scores N/A.

Which has a larger context window?

Claude Opus 4.6 supports 1M context, while GPT-5.5 supports 128K.

Is Claude Opus 4.6 or GPT-5.5 open source?

Claude Opus 4.6 is proprietary. GPT-5.5 is proprietary.

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