Best LLMs, October 2026

The question is never which model is best, but best at what. Each list below answers one version of it from the same independent data, as of 21 Oct 2026.

• Best LLM overall (October 2026) Claude Opus 5.5BenchLeader Index 72.7
• Best LLM for coding (October 2026) Claude Opus 5.5coding score 82.2
• Best LLM for agents (October 2026) Grok 4.1 Fastagents score 70.5
• Best cheap LLM (October 2026) Gemini 3.8 Flashindex 64.5 at $1.50/M
• Best open-weights LLM (October 2026) Kimi K3BenchLeader Index 64.9
• Fastest LLM (October 2026) K2 Horizon 375B A23Boutput speed 1115 tok/s