Category
reasoning
GPT-5
OpenAI's next-generation flagship model succeeding GPT-4o.
Aug 7, 2025400K ctxGrok 4
xAI's Grok 4 reasoning flagship.
Jul 9, 2025256K ctxGemini 2.5 Pro
Reasoning-focused member of the Gemini 2.5 family.
Mar 25, 20251M ctxDeepSeek R1
Open-weight reasoning model that popularized reinforcement-learned chain-of-thought at scale.
Jan 20, 2025128K ctxOpenAI o1
OpenAI o1 is a reasoning model that thinks through a problem internally before replying, trading latency and cost for much higher accuracy on maths, science and difficult programming tasks. It reached general availability in December 2024 and set the template for later reasoning models.
Dec 5, 2024200K ctxGPT-4
Multimodal successor to GPT-3.5 with substantial gains on reasoning benchmarks.
Mar 14, 20238.2K ctx