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Claude Opus 5.5 vs Claude Sonnet 5.5

Find the right model, side by side.

Across 18 shared evaluation tracks, Claude Opus 5.5 leads on 13, Claude Sonnet 5.5 leads on 5, and 0 are tied. These counts describe reported scores within matched setups, not an overall model ranking. At the initially selected providers, input/output prices are $4.00 / $20.00 for Claude Opus 5.5 and $2.00 / $10.00 for Claude Sonnet 5.5, per million tokens.

Updated: Data as of:
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Model specifications

Specifications for Claude Opus 5.5 and Claude Sonnet 5.5. Prices and performance use the selected provider offering.
SpecificationsClaude Opus 5.5AnthropicClaude Sonnet 5.5Anthropic
Provider
Context sizetokens1,000,0001,000,000
Cutoff dateNot reportedNot reported
Input costUSD / 1M tokens$4.00$2.00
Output costUSD / 1M tokens$20.00$10.00
Max outputtokens128,000128,000
LatencyTTFT · seconds640.87514.907
Speedtokens / sec95.521139.308

Benchmark performance

18 shared benchmark comparisons. Versions and setups matched.

Claude Opus 5.5Claude Sonnet 5.5

GDPval-AA

2.1 ↗
  1. Claude Opus 5.5: 1,866.27 Elo
  2. Claude Sonnet 5.5: 1,837.82 Elo