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GPT-4.1 Nano vs GPT-5 Codex

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

  • GPT-5 Codex has the higher intelligence index (87.1 vs 42.1)
  • GPT-4.1 Nano is cheaper ($0.10 vs $1.25 per 1M input)
  • GPT-4.1 Nano is faster
  • GPT-4.1 Nano has a larger context window (1M)
GPT-4.1 NanoGPT-5 Codex
Intelligence index42.187.1
DeveloperOpenAIOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window1,047,576 tokens400,000 tokens
Input price$0.10 / 1M$1.25 / 1M
Output price$0.40 / 1M$10.00 / 1M
Speed200 tok/s180 tok/s
ReleasedApril 14, 2025September 23, 2025
Parameters
Input modalitiesImage, TextText, Image
Output modalitiesTextText

Shared benchmarks

GPT-4.1 Nano
GPT-5 Codex
AIME 2025
24
98.7
GPQA Diamond
50.3
83.7
Humanity’s Last Exam
3.9
25.6
LiveCodeBench
32.6
84
MMLU-Pro
65.7
86.5