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Devstral Small vs GPT-5.1

Mistral AI vs OpenAI — benchmarks, pricing, and capabilities side by side.

  • GPT-5.1 has the higher intelligence index (89 vs 45.3)
  • Devstral Small is cheaper ($0.10 vs $1.25 per 1M input)
  • Devstral Small is faster
Devstral SmallGPT-5.1
Intelligence index45.389
DeveloperMistral AIOpenAI
TypeLLMLLM
AccessAPI only
Context window400,000 tokens
Input price$0.10 / 1M$1.25 / 1M
Output price$0.30 / 1M$10.00 / 1M
Speed190 tok/s115 tok/s
ReleasedMay 21, 2025November 12, 2025
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

Devstral Small
GPT-5.1
AIME 2025
29.3
94
GPQA Diamond
43.4
88.1
Humanity’s Last Exam
4
26.5
LiveCodeBench
25.8
86.8
MMLU-Pro
63.2
87