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GPT-5 nano 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 71.2)
  • GPT-5 nano is cheaper ($0.05 vs $2.00 per 1M input)
  • GPT-5 nano is faster
GPT-5 nanoGrok 4.20 0309
Intelligence index71.288.5
DeveloperOpenAIxAI
TypeLLMLLM
AccessAPI only
Context window400,000 tokens
Input price$0.05 / 1M$2.00 / 1M
Output price$0.40 / 1M$6.00 / 1M
Speed500 tok/s97 tok/s
ReleasedAugust 7, 2025March 10, 2026
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5 nano
Grok 4.20 0309
GPQA Diamond
71.2
88.5
Humanity’s Last Exam
8.7
30