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GPT-5.1 vs Sonar Reasoning

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

  • GPT-5.1 has the higher intelligence index (89 vs 77.2)
  • Sonar Reasoning is cheaper ($0.00 vs $1.25 per 1M input)
GPT-5.1Sonar Reasoning
Intelligence index8977.2
DeveloperOpenAIPerplexity
TypeLLMLLM
AccessAPI only
Context window400,000 tokens
Input price$1.25 / 1M$0.00 / 1M
Output price$10.00 / 1M$0.00 / 1M
Speed115 tok/s
ReleasedNovember 12, 2025January 28, 2025
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5.1
Sonar Reasoning
GPQA Diamond
88.1
62.3