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Claude Opus 5.5 vs GPT-6 Astra

Find the right model, side by side.

Across 17 shared evaluation tracks, Claude Opus 5.5 leads on 9, GPT-6 Astra leads on 7, and 1 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 $10.00 / $50.00 for GPT-6 Astra, per million tokens.

Updated: Data as of:
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Model specifications

Specifications for Claude Opus 5.5 and GPT-6 Astra. Prices and performance use the selected provider offering.
SpecificationsClaude Opus 5.5AnthropicGPT-6 AstraOpenAI
Provider
Context sizetokens1,000,0001,000,000
Cutoff dateNot reported2026-04-30
Input costUSD / 1M tokens$4.00$10.00
Output costUSD / 1M tokens$20.00$50.00
Max outputtokens128,000128,000
LatencyTTFT · seconds640.87365.127
Speedtokens / sec95.52170.564

Benchmark performance

17 shared benchmark comparisons. Versions and setups matched.

Claude Opus 5.5GPT-6 Astra

GDPval-AA

2.1 ↗
  1. Claude Opus 5.5: 1,866.27 Elo
  2. GPT-6 Astra: 1,583.69 Elo