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Claude Opus 4.5 vs Claude Opus 4.8

Claude Opus 4.5 leads in 2 of 8 categories

Arena ELO

Claude Opus 4.5

Cheaper

Tie

Faster

Claude Opus 4.5

Detailed Comparison

CategoryClaude Opus 4.5Claude Opus 4.8
ProviderAnthropic Anthropic
Context Window200K 200K
Input Price ($/1M)$5 $5
Output Price ($/1M)$25 $25
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 4.8?

Claude Opus 4.8 is approximately 0% cheaper than Claude Opus 4.5 per million tokens.

Which is better for coding, Claude Opus 4.5 or Claude Opus 4.8?

Claude Opus 4.5 scores 80.9% SWE-bench on coding benchmarks, while Claude Opus 4.8 scores N/A.

Which has a larger context window?

Claude Opus 4.5 supports 200K context, while Claude Opus 4.8 supports 200K.

Is Claude Opus 4.5 or Claude Opus 4.8 open source?

Claude Opus 4.5 is proprietary. Claude Opus 4.8 is proprietary.

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