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Claude Opus 4.5 vs Claude Opus 5

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 4.5Claude Opus 5
ProviderAnthropic Anthropic
Context Window200K 200K
Input Price ($/1M)$5 WIN$15
Output Price ($/1M)$25 WIN$75
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 Claude Opus 5?

Claude Opus 4.5 is approximately 67% cheaper than Claude Opus 5 per million tokens.

Which is better for coding, Claude Opus 4.5 or Claude Opus 5?

Claude Opus 4.5 scores 80.9% SWE-bench on coding benchmarks, while Claude Opus 5 scores N/A.

Which has a larger context window?

Claude Opus 4.5 supports 200K context, while Claude Opus 5 supports 200K.

Is Claude Opus 4.5 or Claude Opus 5 open source?

Claude Opus 4.5 is proprietary. Claude Opus 5 is proprietary.

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