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GPT-5.1 vs Solar Pro 2

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

  • GPT-5.1 has the higher intelligence index (89 vs 72.5)
  • Solar Pro 2 is cheaper ($0.00 vs $1.25 per 1M input)
GPT-5.1Solar Pro 2
Intelligence index8972.5
DeveloperOpenAIUpstage
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, 2025May 20, 2025
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5.1
Solar Pro 2
AIME 2025
94
61.3
GPQA Diamond
88.1
68.7
Humanity’s Last Exam
26.5
7
LiveCodeBench
86.8
61.6
MMLU-Pro
87
80.5