← All Models

Claude Opus 4.5 vs GPT-5.5

Claude Opus 4.5 leads in 4 of 8 categories

Arena ELO

Claude Opus 4.5

Cheaper

Tie

Faster

Claude Opus 4.5

Detailed Comparison

CategoryClaude Opus 4.5GPT-5.5
ProviderAnthropic OpenAI
Context Window200K WIN128K
Input Price ($/1M)$5 $5
Output Price ($/1M)$25 WIN$30
Arena ELO1380 WINN/A
Coding80.9% SWE-bench N/A
Reasoningunknown N/A
Speed (tokens/sec)~35 t/s WINN/A
Open SourceNo No

Frequently Asked Questions

Which is cheaper, Claude Opus 4.5 or GPT-5.5?

Claude Opus 4.5 is approximately 14% cheaper than GPT-5.5 per million tokens.

Which is better for coding, Claude Opus 4.5 or GPT-5.5?

Claude Opus 4.5 scores 80.9% SWE-bench on coding benchmarks, while GPT-5.5 scores N/A.

Which has a larger context window?

Claude Opus 4.5 supports 200K context, while GPT-5.5 supports 128K.

Is Claude Opus 4.5 or GPT-5.5 open source?

Claude Opus 4.5 is proprietary. GPT-5.5 is proprietary.

Related Articles

Anthropic extends Claude Fable access after GPT-5.6

Claude's J-space is not consciousness, but it matters

Claude Code MCP setup that connects real tools

Claude Reflect turns usage into retention

Claude Code’s backdoor scare points to 4 real risks

Anthropic’s Claude Skills define the new agent toolkit

More Comparisons

Claude Opus 4.5 vs Llama 4 ScoutClaude Opus 4.5 vs Claude Sonnet 4.6Claude Opus 4.5 vs Claude Haiku 4.5Claude Opus 4.5 vs Qwen 3.6Claude Opus 4.5 vs Claude Fable 5Claude Opus 4.5 vs Kimi K2.7 CodeClaude Opus 4.5 vs DeepSeek V4 FlashClaude Opus 4.5 vs GPT-5.6 LunaGPT-5.5 vs Llama 4 ScoutGPT-5.5 vs Claude Sonnet 4.6GPT-5.5 vs Claude Haiku 4.5GPT-5.5 vs Qwen 3.6GPT-5.5 vs Claude Fable 5GPT-5.5 vs Kimi K2.7 CodeGPT-5.5 vs DeepSeek V4 FlashGPT-5.5 vs GPT-5.6 Luna