AI Hub
← All models

GPT-5.1-Codex vs GPT-5.3-Codex

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

  • GPT-5.3-Codex has the higher intelligence index (91.5 vs 88.2)
  • GPT-5.1-Codex is cheaper ($1.25 vs $1.75 per 1M input)
  • GPT-5.1-Codex is faster
GPT-5.1-CodexGPT-5.3-Codex
Intelligence index88.291.5
DeveloperOpenAIOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window400,000 tokens400,000 tokens
Input price$1.25 / 1M$1.75 / 1M
Output price$10.00 / 1M$14.00 / 1M
Speed188 tok/s73 tok/s
ReleasedNovember 13, 2025February 24, 2026
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

GPT-5.1-Codex
GPT-5.3-Codex
GPQA Diamond
86
91.5
Humanity’s Last Exam
23.4
39.9