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Claude Opus 4.1 vs GPT-5.1

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

  • GPT-5.1 has the higher intelligence index (89 vs 75.4)
  • GPT-5.1 is cheaper ($1.25 vs $15.00 per 1M input)
  • Claude Opus 4.1 is faster
  • GPT-5.1 has a larger context window (400K)
Claude Opus 4.1GPT-5.1
Intelligence index75.489
DeveloperAnthropicOpenAI
TypeLLMLLM
AccessAPI onlyAPI only
Context window200,000 tokens400,000 tokens
Input price$15.00 / 1M$1.25 / 1M
Output price$75.00 / 1M$10.00 / 1M
Speed120 tok/s115 tok/s
ReleasedAugust 5, 2025November 12, 2025
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

Claude Opus 4.1
GPT-5.1
AIME 2025
78
94
GPQA Diamond
80.9
88.1
Humanity’s Last Exam
11.9
26.5
LiveCodeBench
65.4
86.8
MMLU-Pro
88
87