GPT-5.1
OpenAI🇺🇸 United States
GPT-5 refresh in Instant and Thinking variants — warmer conversational default, adaptive reasoning that spends thinking tokens only when needed.
Context window400K tokens
Input / 1M tokens$1.25
Output / 1M tokens$10
Version History
gpt-5-1-launchmajor
GPT-5.1 launches. GPT-5 refresh in Instant and Thinking variants — warmer conversational default, adaptive reasoning that spends thinking tokens only when needed.
Benchmark Scores
Full leaderboard →94.0%
AIME 2025
1439.0 elo
Arena Elo
88.1%
GPQA
51.3%
Hallucination (Knowledge)
10.9%
Hallucination Rate
85.4%
MMMU
76.3%
SWE-bench Verified