OpenAI
As of 2026-10-18, OpenAI has 115 models on the meo leaderboard, 10 first-party-tested. Its highest-ranked model is OpenAI: GPT-5.5 (#1, 94.1%), while OpenAI: GPT-6.1 Sol leads on Effective Value (π).
Official: openai.com Β· huggingface.co/openai
Frequently asked questions
How many AI models does OpenAI have?
OpenAI has 115 models on the meo leaderboard, of which 10 are first-party-tested. Its best-ranked model is OpenAI: GPT-5.5 at #1 (94.1% accuracy).
What is OpenAI's best AI model?
On the un-leaked meo benchmark, OpenAI's top model is OpenAI: GPT-5.5, ranked #1 overall with 94.1% accuracy, while OpenAI: GPT-6.1 Sol leads the lab on Effective Value (π).
Does OpenAI release open-weights models?
Yes β 7 of OpenAI's 115 listed models are open-weights (self-hostable).
Related: all AI labs Β· full leaderboard Β· rankings Β· methodology.