Kimi K2 0905: pricing, context and performance

What you need to know

Kimi K2 0905 is a language model from Moonshot AI, released on September 5, 2025. That makes it more than a year old: successors may have shipped since. Its weights are published: you can download it and run it on your own servers, or use one of the 15 API providers that list it on models.dev. It has no declared reasoning mode: it answers directly, without an extra billed thinking step.

We file it under open-weight models (68 models in this category on the site).

Benchmark results

Epoch AI publishes a single result for Kimi K2 0905 on our basket's benchmarks: too few to compute a reliable capability index.

• Aider Polyglot (code editing across several languages): 5,910% — the best tracked model, GPT-5, reaches 8,800%

Technical specifications

Its context window reaches 262,144 tokens, roughly 393 pages of text at 500 words per page: enough for a long report or several contracts at once. A single answer can run to 262,144 tokens.

It accepts as input: text. Its knowledge stops at June 2025: beyond that, it needs web search or your documents.

It can call tools (functions, APIs), which makes it a possible foundation for an AI agent.

The weights are published on Hugging Face (moonshotai/Kimi-K2-Instruct-0905). See also our list of open-source models.

Pricing and budget

Kimi K2 0905 costs $0.60 per million input tokens and $2.5 per million output tokens (median of 15 providers, checked on October 22, 2026).

To put it in perspective: reading 20,000 tokens (about thirty pages) and writing 2,000 costs roughly $0.017; a thousand of those tasks, $17.

That is 2.5 times the median output price of open-weight models ($1).

To estimate your own budget, use the agent cost calculator.

Who is it for?

Given its category, Kimi K2 0905 is mainly aimed at projects where you want control over your data or hosting, or want to adapt the model to your field.

Before adopting it, test it on your own examples: benchmarks measure standard tasks, not your job.

What could replace it?

In the same category, the models closest to Kimi K2 0905 are:

• Kimi K2 Thinking (Moonshot AI, index 69.6)
• Hy4 preview (Tencent (Hunyuan), $2.5 per million output tokens)
• Nemotron 3 Ultra 550B A55B (NVIDIA, $2.4 per million output tokens)
• GLM-5 (Zhipu AI (Z.ai), index 77.2)