# Kimi K2 Instruct 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) > **Quick answer:** Kimi K2 Instruct 0905 is Moonshot AI's September 2025 checkpoint of Kimi K2 Instruct, scoring 76.5% ACEBench and 81.1% MMLU-Pro. Apache 2.0 licensed for full commercial use. ## At a Glance **Where Kimi K2 Instruct 0905 leads** - 76.5% ACEBench — strong coding task performance - 81.1% MMLU-Pro — competitive academic knowledge - Apache 2.0 — fully open for commercial use and fine-tuning - Updated September 2025 checkpoint over base K2 Instruct **Where it lags** - Limited public benchmark coverage beyond ACEBench and MMLU-Pro - Proprietary training data details - Text-only modality **Best for:** Open-source coding and reasoning pipelines; teams requiring Apache 2.0 MoE models with strong coding capability. ## What Kimi K2 Instruct 0905 Is Kimi K2 Instruct 0905 is the September 2025 checkpoint of Moonshot AI's Kimi K2 Instruct model. The "0905" suffix (September 5, 2025) indicates a post-release update from the base Kimi K2 Instruct. Kimi K2 is a mixture-of-experts (MoE) model built for agentic tasks and coding, with the Instruct variant optimised for instruction-following. With 76.5% ACEBench and 81.1% MMLU-Pro under Apache 2.0, this checkpoint is competitive for open-source deployment in coding-heavy pipelines. ## Specifications | Field | Value | |---|---| | Organization | Moonshot AI | | License | Apache 2.0 | | Release date | July 2025 (checkpoint: Sept 2025) | | Architecture | MoE (Mixture of Experts) | | 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 | |---|---|---|---| | [ACEBench](/benchmarks/acebench) | 76.5% | Benchgen evaluation | 2025-09 | | [MMLU-Pro](/benchmarks/mmlu-pro) | 81.1% | Benchgen evaluation | 2025-09 | ## Kimi K2 Instruct 0905 vs Alternatives | Model | MMLU-Pro | License | Architecture | |---|---|---|---| | **Kimi K2 Instruct 0905** | 81.1% | Apache 2.0 | MoE | | [Kimi K2 Thinking 0905](/models/moonshot/kimi-k2-thinking-0905) | 84.6% | Apache 2.0 | MoE (Thinking) | | [QwQ-32B](/models/qwen/qwq-32b) | — | Apache 2.0 | Dense | | [DeepSeek-V3](/models/deepseek/deepseek-v3) | — | MIT | MoE | Kimi K2 Instruct 0905 vs Kimi K2 Thinking 0905: lower MMLU-Pro (81.1% vs 84.6%) but likely faster inference without thinking overhead. For direct instruction-following, Instruct 0905; for advanced reasoning, Thinking 0905. ## Related Models & Benchmarks - Compare: [Kimi K2 Thinking 0905](/models/moonshot/kimi-k2-thinking-0905) · [Kimi K2 Instruct](/models/moonshot/kimi-k2-instruct) · [DeepSeek-V3](/models/deepseek/deepseek-v3) - Benchmarks: [ACEBench](/benchmarks/acebench) · [MMLU-Pro](/benchmarks/mmlu-pro) ## Frequently Asked Questions

What is Kimi K2 Instruct 0905?

Moonshot AI's September 2025 checkpoint of Kimi K2 Instruct, scoring 76.5% ACEBench and 81.1% MMLU-Pro. Apache 2.0 MoE model for coding and reasoning.

What is the difference between Kimi K2 Instruct and Kimi K2 Instruct 0905?

Kimi K2 Instruct 0905 is a later checkpoint (September 5, 2025) with updated training compared to the base Kimi K2 Instruct release. The 0905 checkpoint may include improved alignment or performance updates.

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

Kimi K2-Instruct-0905 — Files