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GPT-5.2 vs Grok 4.20 0309

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

  • Grok 4.20 0309 has the higher intelligence index (88.5 vs 86.2)
  • GPT-5.2 is cheaper ($1.75 vs $2.00 per 1M input)
  • Grok 4.20 0309 is faster
GPT-5.2Grok 4.20 0309
Intelligence index86.288.5
DeveloperOpenAIxAI
TypeLLMLLM
AccessAPI only
Context window400,000 tokens
Input price$1.75 / 1M$2.00 / 1M
Output price$14.00 / 1M$6.00 / 1M
Speed73 tok/s97 tok/s
ReleasedDecember 11, 2025March 10, 2026
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5.2
Grok 4.20 0309
GPQA Diamond
92.4
88.5
Humanity’s Last Exam
35.4
30