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Claude 3 Opus vs GPT-5.1

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

  • GPT-5.1 has the higher intelligence index (89 vs 58.5)
  • GPT-5.1 is cheaper ($1.25 vs $15.00 per 1M input)
  • Claude 3 Opus is faster
  • GPT-5.1 has a larger context window (400K)
Claude 3 OpusGPT-5.1
Intelligence index58.589
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
ReleasedMarch 4, 2024November 12, 2025
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

Claude 3 Opus
GPT-5.1
GPQA Diamond
50.4
88.1
Humanity’s Last Exam
3.1
26.5
LiveCodeBench
27.9
86.8
MMLU-Pro
68.5
87