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gpt-oss-120b vs Grok 4.3

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

  • Grok 4.3 has the higher intelligence index (90.1 vs 79.6)
  • gpt-oss-120b is cheaper ($0.04 vs $1.25 per 1M input)
  • gpt-oss-120b is faster
  • Grok 4.3 has a larger context window (1M)
gpt-oss-120bGrok 4.3
Intelligence index79.690.1
DeveloperOpenAIxAI
TypeLLMLLM
AccessOpen weightsAPI only
Context window131,072 tokens1,000,000 tokens
Input price$0.04 / 1M$1.25 / 1M
Output price$0.18 / 1M$2.50 / 1M
Speed500 tok/s88 tok/s
ReleasedAugust 5, 2025May 6, 2026
Parameters117B (5.1B active)
Input modalitiesTextText, Image
Output modalitiesTextText

Shared benchmarks

gpt-oss-120b
Grok 4.3
GPQA Diamond
80.9
90.1
Humanity’s Last Exam
19
35