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GPT-5 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 80.5)
  • GPT-5 is cheaper ($1.25 vs $2.00 per 1M input)
  • GPT-5 is faster
GPT-5Grok 4.20 0309
Intelligence index80.588.5
DeveloperOpenAIxAI
TypeLLMLLM
AccessAPI only
Context window400,000 tokens
Input price$1.25 / 1M$2.00 / 1M
Output price$10.00 / 1M$6.00 / 1M
Speed100 tok/s97 tok/s
ReleasedAugust 7, 2025March 10, 2026
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5
Grok 4.20 0309
GPQA Diamond
87.3
88.5
Humanity’s Last Exam
24.8
30