# Kimi K2 0905

> Kimi K2 0905 is an open-weight language model from Moonshot AI, released on 4 Sept 2025. It accepts text and generates text, with a 262K-token context window and up to 98K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.60 per million input tokens and $2.50 per million output tokens (OpenRouter), across 1 provider we track.

Source page: https://www.aimodel.directory/models/kimi-k2-0905
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Moonshot AI
- **Release date:** 4 Sept 2025 (source: OpenRouter, https://openrouter.ai/moonshotai/kimi-k2-0905)
- **Status:** Generally available
- **Weights:** Open weights (source: Hugging Face, https://huggingface.co/moonshotai/Kimi-K2-Instruct-0905)
- **License:** modified-mit (source: Hugging Face, https://huggingface.co/moonshotai/Kimi-K2-Instruct-0905)
- **Parameters:** 1T (source: Hugging Face, https://huggingface.co/moonshotai/Kimi-K2-Instruct-0905)
- **Context window:** 262K (262,144 tokens) (source: OpenRouter, https://openrouter.ai/moonshotai/kimi-k2-0905)
- **Max output:** 98K tokens (source: OpenRouter, https://openrouter.ai/moonshotai/kimi-k2-0905)
- **Knowledge cutoff:** 31 Dec 2024 (source: OpenRouter, https://openrouter.ai/moonshotai/kimi-k2-0905)
- **Input:** Text (source: OpenRouter, https://openrouter.ai/moonshotai/kimi-k2-0905)
- **Output:** Text (source: OpenRouter, https://openrouter.ai/moonshotai/kimi-k2-0905)
- **Reasoning mode:** No (source: OpenRouter, https://openrouter.ai/moonshotai/kimi-k2-0905)
- **Tool calling:** Yes (source: OpenRouter, https://openrouter.ai/moonshotai/kimi-k2-0905)
- **Structured output:** Yes (source: OpenRouter, https://openrouter.ai/moonshotai/kimi-k2-0905)
- **Hugging Face:** moonshotai/Kimi-K2-Instruct-0905 (source: Hugging Face, https://huggingface.co/moonshotai/Kimi-K2-Instruct-0905)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $0.60 | $2.50 | – | 262K |

## FAQ

### What is the context window of Kimi K2 0905?

Kimi K2 0905 has a context window of 262,144 tokens (262K) and can generate up to 98,304 tokens in a single response, according to OpenRouter.

### How much does the Kimi K2 0905 API cost?

Kimi K2 0905 is listed from $0.60 per million input tokens and $2.50 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### Is Kimi K2 0905 open source?

Kimi K2 0905 is an open-weight model: its weights are published on Hugging Face as moonshotai/Kimi-K2-Instruct-0905 under the modified-mit license. Check the license terms before commercial use.

### When was Kimi K2 0905 released?

Moonshot AI released Kimi K2 0905 on 4 Sept 2025, according to OpenRouter.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Kimi K2 0905", https://www.aimodel.directory/models/kimi-k2-0905