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Claude 1 vs GPT-5.1

Anthropic vs OpenAI — benchmarks, pricing, and capabilities side by side.

Claude 1GPT-5.1
Intelligence index—89
DeveloperAnthropicOpenAI
TypeLLMLLM
AccessAPI onlyAPI only
Context window—400,000 tokens
Input price—$1.25 / 1M
Output price—$10.00 / 1M
Speed—115 tok/s
ReleasedMarch 14, 2023November 12, 2025
Parameters——
Input modalitiesTextText, Image
Output modalitiesTextText
Claude 1 details GPT-5.1 details