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Claude Opus 4.5 vs o3

Claude Opus 4.5 leads in 4 of 8 categories

Arena ELO

Claude Opus 4.5

Cheaper

Claude Opus 4.5

Faster

Claude Opus 4.5

Detailed Comparison

CategoryClaude Opus 4.5o3
ProviderAnthropic OpenAI
Context Window200K 200K
Input Price ($/1M)$5 WIN$10
Output Price ($/1M)$25 WIN$40
Arena ELO1380 WIN1350
Coding80.9% SWE-bench unknown
Reasoningunknown unknown
Speed (tokens/sec)~35 t/s WIN~30 t/s
Open SourceNo No

Frequently Asked Questions

Which is cheaper, Claude Opus 4.5 or o3?

Claude Opus 4.5 is approximately 40% cheaper than o3 per million tokens.

Which is better for coding, Claude Opus 4.5 or o3?

Claude Opus 4.5 scores 80.9% SWE-bench on coding benchmarks, while o3 scores unknown.

Which has a larger context window?

Claude Opus 4.5 supports 200K context, while o3 supports 200K.

Is Claude Opus 4.5 or o3 open source?

Claude Opus 4.5 is proprietary. o3 is proprietary.

Which ranks higher on the Chatbot Arena leaderboard?

Claude Opus 4.5 ranks higher with ELO 1380 vs 1350.