MoonshotAI: Kimi K2 0905 (exacto)
Analysis Summary
MoonshotAI: Kimi K2 0905 (exacto) sits in the Legacy tier on our leaderboard, ranked #434 of 561 published models on overall intelligence. At $0.600 input and $2.50 output per 1M tokens, it is among the most expensive on the market. It offers a generous context window for extended reasoning and code review and supports tool use, function calling, and reasoning.
Editorial notes
Kimi K2 0905 (exacto) is a variant of the K2 family with a 262K context window and tool use, but no benchmark data is available to assess its capability independently.
Assessed May 14, 2026
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
Kimi K2 0905 is the September update of Kimi K2 0711. It is a large-scale Mixture-of-Experts (MoE) language model developed by Moonshot AI, featuring 1 trillion total parameters with 32 billion active per forward pass. It supports long-context inference up to 256k tokens, extended from the previous 128k. This update improves agentic coding with higher accuracy and better generalization across scaffolds, and enhances frontend coding with more aesthetic and functional outputs for web, 3D, and related tasks. Kimi K2 is optimized for agentic capabilities, including advanced tool use, reasoning, and code synthesis. It excels across coding (LiveCodeBench, SWE-bench), reasoning (ZebraLogic, GPQA), and tool-use (Tau2, AceBench) benchmarks. The model is trained with a novel stack incorporating the MuonClip optimizer for stable large-scale MoE training.
Capabilities
How does MoonshotAI: Kimi K2 0905 (exacto) stack up?
Compare side-by-side with other legacy models.
Model Information
| OpenRouter ID |
moonshotai/kimi-k2-0905:exacto
|
| Provider | moonshotai |
| Release Date | September 4, 2025 |
| Context Length | 262,144 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.60 | $0.000600 |
| Output | $2.50 | $0.002500 |
Live Performance
Live endpoint metrics ā refreshed every 30 minutes.
