# Kimi K2 Thinking 0905 ![Organization](https://img.shields.io/badge/Org-Moonshot-2d9de8) ![License](https://img.shields.io/badge/License-Apache%202.0-22c55e) ![Released](https://img.shields.io/badge/Released-Jul%202025-555) ![Reasoning](https://img.shields.io/badge/Type-Thinking-8250df) > **Quick answer:** Kimi K2 Thinking 0905 is Moonshot AI's September 2025 reasoning checkpoint of Kimi K2, scoring 60.2% BrowseComp, 51.0% HLE, 84.6% MMLU-Pro, 47.1% TerminalBench, and 44.8% SciCode. Apache 2.0 — notable as an open-weight model with these frontier-class reasoning scores. ## At a Glance **Where Kimi K2 Thinking 0905 leads** - 60.2% BrowseComp — strong web navigation/research - 51.0% HLE — among top open-weight scores on Humanity's Last Exam - 84.6% MMLU-Pro — strong academic knowledge with reasoning - 47.1% TerminalBench — solid terminal task performance - Apache 2.0 — fully open for commercial use **Where it lags** - 44.8% SciCode — moderate scientific coding - MoE with thinking overhead — higher latency than instruct variants - Text-only - July 2025 release — pre-dates some newer frontier models **Best for:** Open-source frontier-class reasoning; web research pipelines; academic knowledge tasks; teams needing Apache 2.0 models with o3-tier reasoning. ## What Kimi K2 Thinking 0905 Is Kimi K2 Thinking 0905 is the thinking (chain-of-thought reasoning) variant of Moonshot AI's Kimi K2 model family, at the September 5, 2025 checkpoint. Kimi K2 is a large MoE model; the "Thinking" variant extends it with a reasoning mode similar to DeepSeek-R1 and QwQ-32B. The BrowseComp score (60.2%) is notable — this benchmark tests multi-step web research ability, and 60% is in the frontier tier. Combined with 51.0% HLE, this is one of the strongest open-weight reasoning models from mid-2025. ## Specifications | Field | Value | |---|---| | Organization | Moonshot AI | | License | Apache 2.0 | | Release date | July 2025 (checkpoint: Sept 2025) | | Architecture | MoE with chain-of-thought reasoning | | Modality | Text only | ## Pricing Open weights under Apache 2.0 — self-host at no license cost. Also available via Moonshot AI API. ## Public Benchmark Scores | Benchmark | Score | Source | Date | |---|---|---|---| | [BrowseComp](/benchmarks/browsecomp) | 60.2% | Benchgen evaluation | 2025-09 | | [Humanity's Last Exam](/benchmarks/humanitys-last-exam) | 51.0% | Benchgen evaluation | 2025-09 | | [MMLU-Pro](/benchmarks/mmlu-pro) | 84.6% | Benchgen evaluation | 2025-09 | | [TerminalBench](/benchmarks/terminalbench) | 47.1% | Benchgen evaluation | 2025-09 | | [SciCode](/benchmarks/scicode) | 44.8% | Benchgen evaluation | 2025-09 | ## Kimi K2 Thinking 0905 vs Alternatives | Model | HLE | BrowseComp | MMLU-Pro | License | |---|---|---|---|---| | **Kimi K2 Thinking 0905** | 51.0% | 60.2% | 84.6% | Apache 2.0 | | [Kimi K2 Instruct 0905](/models/moonshot/kimi-k2-instruct-0905) | — | — | 81.1% | Apache 2.0 | | [GLM-5.2](/models/zhipuai/glm-5-2) | 54.7% | — | — | Proprietary | | [GPT-5.5](/models/openai/gpt-5-5) | 41.4% | 84.4% | — | Proprietary | Kimi K2 Thinking 0905 leads open-weight models on HLE (51.0%) and BrowseComp (60.2%). It beats GPT-5.5 on HLE (51.0% vs 41.4%) while remaining Apache 2.0. GLM-5.2 leads on HLE (54.7%) but is proprietary. ## Related Models & Benchmarks - Compare: [Kimi K2 Instruct 0905](/models/moonshot/kimi-k2-instruct-0905) · [GLM-5.2](/models/zhipuai/glm-5-2) · [GPT-5.5](/models/openai/gpt-5-5) - Benchmarks: [BrowseComp](/benchmarks/browsecomp) · [Humanity's Last Exam](/benchmarks/humanitys-last-exam) · [MMLU-Pro](/benchmarks/mmlu-pro) ## Frequently Asked Questions

What is Kimi K2 Thinking 0905?

Moonshot AI's September 2025 reasoning checkpoint of Kimi K2, scoring 60.2% BrowseComp, 51.0% HLE, and 84.6% MMLU-Pro. Apache 2.0 MoE with chain-of-thought reasoning.

How does Kimi K2 Thinking 0905 compare to GLM-5.2 on HLE?

GLM-5.2 leads (54.7% vs 51.0%) but is proprietary. Kimi K2 Thinking 0905 is the top open-weight (Apache 2.0) model for HLE-class reasoning tasks.

--- *Specs from Moonshot AI's Kimi K2 Thinking 0905 release and Benchgen evaluations. Last updated 2026-07-24.*

Kimi K2-Thinking-0905 — Files