Question 1

What is the best LLM for reasoning?

Accepted Answer

GPT-6.1 Sol from OpenAI ranks first (reasoning score 78.6), followed by Gemini 4 Argon (78.0) and GPT-6 Astra (77.1). Ranked by the Respan Index reasoning score, which combines reasoning and math benchmarks such as FrontierMath, Humanity's Last Exam, ARC-AGI-2 and GPQA Diamond. Only models with published reasoning results are ranked.

Question 2

How is this ranking made?

Accepted Answer

Ranked by the Respan Index reasoning score, which combines reasoning and math benchmarks such as FrontierMath, Humanity's Last Exam, ARC-AGI-2 and GPQA Diamond. Only models with published reasoning results are ranked. The Respan Index combines published benchmark results, each linked to its source, and is updated as new results come out.

Question 3

Can I use these models through one API?

Accepted Answer

Yes. The Respan gateway serves models from every major provider behind one OpenAI-compatible API, with fallbacks when a provider fails.

Models

Models

Best LLM for reasoning

FAQ

Best model for other jobs