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Claude 3 Haiku vs GPT-5.2-Codex

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

  • GPT-5.2-Codex has the higher intelligence index (89.9 vs 38.9)
  • Claude 3 Haiku is cheaper ($0.25 vs $1.75 per 1M input)
  • GPT-5.2-Codex is faster
  • GPT-5.2-Codex has a larger context window (400K)
Claude 3 HaikuGPT-5.2-Codex
Intelligence index38.989.9
DeveloperAnthropicOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window200,000 tokens400,000 tokens
Input price$0.25 / 1M$1.75 / 1M
Output price$1.25 / 1M$14.00 / 1M
Speed104 tok/s106 tok/s
ReleasedMarch 13, 2024January 14, 2026
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

Claude 3 Haiku
GPT-5.2-Codex
GPQA Diamond
33.3
89.9
Humanity’s Last Exam
3.9
33.5