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GPT-5.5 Instant vs Grok 4.3

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

  • Grok 4.3 is cheaper ($1.25 vs $5.00 per 1M input)
GPT-5.5 InstantGrok 4.3
Intelligence index90.1
DeveloperOpenAIxAI
TypeLLMLLM
AccessAPI only
Context window1,000,000 tokens
Input price$5.00 / 1M$1.25 / 1M
Output price$30.00 / 1M$2.50 / 1M
Speed88 tok/s
ReleasedMay 5, 2026May 6, 2026
Parameters
Input modalitiesText, Image
Output modalitiesText