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GPT-5.1 vs Phi-3 Mini Instruct 3.8B

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

  • GPT-5.1 has the higher intelligence index (89 vs 27.5)
  • Phi-3 Mini Instruct 3.8B is cheaper ($0.00 vs $1.25 per 1M input)
GPT-5.1Phi-3 Mini Instruct 3.8B
Intelligence index8927.5
DeveloperOpenAIMicrosoft
TypeLLMLLM
AccessAPI only
Context window400,000 tokens
Input price$1.25 / 1M$0.00 / 1M
Output price$10.00 / 1M$0.00 / 1M
Speed115 tok/s
ReleasedNovember 12, 2025April 23, 2024
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5.1
Phi-3 Mini Instruct 3.8B
AIME 2025
94
0.3
GPQA Diamond
88.1
31.9
Humanity’s Last Exam
26.5
4.4
LiveCodeBench
86.8
11.6
MMLU-Pro
87
43.5