GPT-5.1 by OpenAI ranks 53rd of 354 ranked models on the Noometry Index as of October 2026, with a score of 49.0. Its strongest category is instruction following, where it ranks 1st. API pricing starts at $1.25 per million input tokens and $10 per million output tokens, with a 400K-token context window.
Every published result we track, with its source. Bold rows are the ones used for ranking; where several exist we prefer independent runs over self-reported numbers.
GPT-5.1 by OpenAI ranks 53rd of 354 ranked models on the Noometry Index as of October 2026, with a score of 49.0. Its strongest category is instruction following, where it ranks 1st. API pricing starts at $1.25 per million input tokens and $10 per million output tokens, with a 400K-token context window.
How much does GPT-5.1 cost?
GPT-5.1 costs $1.25 per million input tokens and $10 per million output tokens on OpenAI's own API, with cached input at $0.13.
What is GPT-5.1's context window?
GPT-5.1 accepts up to 400K tokens of input and can write up to 128K tokens in one response.
Is GPT-5.1 open source?
No. GPT-5.1 is proprietary and available only through OpenAI's API and partner platforms.
What are GPT-5.1's strengths and weaknesses?
Relative to other ranked models, GPT-5.1 places best in instruction following, long context, multimodal and lowest in agentic & tool use, knowledge, coding.
What is GPT-5.1 best at?
Its best category is instruction following, where it ranks 1st on Noometry.