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GPT-5.4 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 74.9)
  • Grok 4.20 0309 is cheaper ($2.00 vs $2.50 per 1M input)
  • Grok 4.20 0309 is faster
GPT-5.4Grok 4.20 0309
Intelligence index74.988.5
DeveloperOpenAIxAI
TypeLLMLLM
AccessAPI only
Context window1,050,000 tokens
Input price$2.50 / 1M$2.00 / 1M
Output price$15.00 / 1M$6.00 / 1M
Speed84 tok/s97 tok/s
ReleasedMarch 5, 2026March 10, 2026
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5.4
Grok 4.20 0309
GPQA Diamond
92
88.5
Humanity’s Last Exam
41.6
30