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Claude Opus 5 vs Gemini 2.5 Flash

Gemini 2.5 Flash leads in 5 of 8 categories

Arena ELO

Gemini 2.5 Flash

Cheaper

Gemini 2.5 Flash

Faster

Gemini 2.5 Flash

Detailed Comparison

CategoryClaude Opus 5Gemini 2.5 Flash
ProviderAnthropic Google
Context Window200K 1M WIN
Input Price ($/1M)$15 $0.1 WIN
Output Price ($/1M)$75 $0.4 WIN
Arena ELON/A 1362 WIN
CodingN/A unknown
ReasoningN/A unknown
Speed (tokens/sec)N/A ~150 t/s WIN
Open SourceNo No

Frequently Asked Questions

Which is cheaper, Claude Opus 5 or Gemini 2.5 Flash?

Gemini 2.5 Flash is approximately 99% cheaper than Claude Opus 5 per million tokens.

Which is better for coding, Claude Opus 5 or Gemini 2.5 Flash?

Claude Opus 5 scores N/A on coding benchmarks, while Gemini 2.5 Flash scores unknown.

Which has a larger context window?

Claude Opus 5 supports 200K context, while Gemini 2.5 Flash supports 1M.

Is Claude Opus 5 or Gemini 2.5 Flash open source?

Claude Opus 5 is proprietary. Gemini 2.5 Flash is proprietary.

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