Best · Best open-weights AI model for reasoning — October 2026
Best open-weights AI model for reasoning — October 2026
As of Oct 14, 2026, Kimi K3 & Mimo V2.6 Pro are tied for state of the art in Reasoning, open weights (since Oct 13, 2026; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).
Top 10
Ranks
Recent crowns
Last crown changes
- Oct 13, 2026 — Reasoning: Kimi K3 and Mimo V2.6 Pro are co-SOTA
- Jul 20, 2026 — Reasoning: Kimi K3 takes the crown
- May 27, 2026 — Reasoning: GLM 5.1 takes the crown
Weights
Which benchmarks count
- Humanity's Last Exam — primary, weight 1
- GPQA Diamond — primary, weight 1
- LMArena Text (style-controlled, hard prompts) — primary, weight 1
- LiveBench — secondary, weight 0.35
Who is SOTA in Reasoning, open weights?
As of Oct 14, 2026, Kimi K3 & Mimo V2.6 Pro are tied for state of the art in Reasoning, open weights (since Oct 13, 2026; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).
Since when is the Reasoning, open weights crown current?
The current crown in Reasoning, open weights has held since Oct 13, 2026.