Kimi K2 Instruct

Name: Kimi K2 Instruct
Author: Moonshot AI

Moonshot AI · 2025-07-11 · 1T parameters

Kimi K2 Instruct is Moonshot AI's open-weight trillion-parameter Mixture-of-Experts instruction model with approximately 32.6B activated parameters. Released in July 2025 as a reflex-grade model without long thinking, it was built on a base pretrained on a reported 15.5 trillion tokens with MuonClip, then post-trained with Muon for coding, tool use, and agentic tasks.

Benchmark scores

Benchmark	Score
A-Fantasia	74.7
A-Fantasia (Valid Attempts with Retries)	57.0
A-Fantasia Backwards Spelling	84.0
A-Fantasia Chess	51.0
A-Fantasia Chess (Valid Attempts with Retries)	37.0
A-Fantasia Cube (Valid Attempts with Retries)	62.0
A-Fantasia Cube Rotation	89.0
A-Fantasia Spelling (Valid Attempts with Retries)	72.0
AA-LCR	51.0
AA-LCR v1.1	53.0
AA-Omniscience Index	-28.3
Aider Polyglot	59.1
AIME 2024 (avg@8)	70.0
AIME 2024-2025	62.7
AIME 2025 (Artificial Analysis avg@10)	57.0
AIME 2025 (avg@8)	55.4
Arena Text — Business, Management & Financial Ops (No Style Control)	1343
Arena Text — Chinese (No Style Control)	1401
Arena Text — Creative Writing (No Style Control)	1323
Arena Text — English (No Style Control)	1377
Arena Text — Entertainment, Sports & Media (No Style Control)	1332
Arena Text — Exclude Ties (No Style Control)	1338
Arena Text — Exclude Ties (Style Controlled)	1406
Arena Text — Expert (No Style Control)	1346
Arena Text — French (No Style Control)	1373
Arena Text — French (Style Controlled)	1427
Arena Text — German (No Style Control)	1374
Arena Text — Hard Prompts (No Style Control)	1365
Arena Text — Hard Prompts English (No Style Control)	1370
Arena Text — Instruction Following (No Style Control)	1324