Models · Moonshot AI

Kimi K3

flagship Open 2026-07-16

Lab: Moonshot AI
Released: 2026-07-16
Parameters: 2.8T total (MoE, ~50B active)
Context window: 1M
Input: text, image, video
Output: text
Weights: Open
Official page: www.kimi.com ↗

Benchmark scores

BrowseComp agentic 91.2%

91.2% 2026-07-17 Moonshot AI releases open Kimi K3, a 2.8T-parameter MoE model with 1M context

DeepSWE agentic 68.5%

68.5% 2026-07-27 Kimi K3 beats GPT-5.6 Sol on DeepSWE pass@4 and costs 64% less

GPQA Diamond reasoning 93.5%

93.5% 2026-07-17 Moonshot AI releases open Kimi K3, a 2.8T-parameter MoE model with 1M context

LMSYS Arena (Elo) general 1679 Elo

1679 Elo 2026-07-24 Kimi K3 launches as largest open-weight model; Muse Spark 1.1 released

MMMU-Pro multimodal 81.6%

81.6% 2026-07-17 Moonshot AI releases open Kimi K3, a 2.8T-parameter MoE model with 1M context

Terminal-Bench agentic 32%

32% 2026-07-29 Fireworks AI releases Fireworks Nexus routing layer for cost control

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