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Claude Opus 4.5 vs GPT-4o

GPT-4o leads in 3 of 8 categories

Arena ELO

Claude Opus 4.5

Cheaper

GPT-4o

Faster

GPT-4o

Detailed Comparison

CategoryClaude Opus 4.5GPT-4o
ProviderAnthropic OpenAI
Context Window200K WIN128K
Input Price ($/1M)$5 $2.5 WIN
Output Price ($/1M)$25 $10 WIN
Arena ELO1380 WIN1340
Coding80.9% SWE-bench 30.8% SWE-bench
Reasoningunknown unknown
Speed (tokens/sec)~35 t/s ~100 t/s WIN
Open SourceNo No

Frequently Asked Questions

Which is cheaper, Claude Opus 4.5 or GPT-4o?

GPT-4o is approximately 58% cheaper than Claude Opus 4.5 per million tokens.

Which is better for coding, Claude Opus 4.5 or GPT-4o?

Claude Opus 4.5 scores 80.9% SWE-bench on coding benchmarks, while GPT-4o scores 30.8% SWE-bench.

Which has a larger context window?

Claude Opus 4.5 supports 200K context, while GPT-4o supports 128K.

Is Claude Opus 4.5 or GPT-4o open source?

Claude Opus 4.5 is proprietary. GPT-4o is proprietary.

Which ranks higher on the Chatbot Arena leaderboard?

Claude Opus 4.5 ranks higher with ELO 1380 vs 1340.