Category
reasoning
GPT-5
OpenAI's next-generation flagship model succeeding GPT-4o.
Aug 7, 2025400K 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 ctxGPT-4
Multimodal successor to GPT-3.5 with substantial gains on reasoning benchmarks.
Mar 14, 20238.2K ctx