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GPT-5.5 Instant vs Grok 4.20 0309

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

  • Grok 4.20 0309 is cheaper ($2.00 vs $5.00 per 1M input)
GPT-5.5 InstantGrok 4.20 0309
Intelligence index88.5
DeveloperOpenAIxAI
TypeLLMLLM
Access
Context window
Input price$5.00 / 1M$2.00 / 1M
Output price$30.00 / 1M$6.00 / 1M
Speed97 tok/s
ReleasedMay 5, 2026March 10, 2026
Parameters
Input modalities
Output modalities