# Kimi K2 (0905)

Kimi K2 (0905) is an AI model released by Moonshot AI on Sep 5 2025. It has 1T parameters, a 256k context window and open weight. At release it scored 75.1% on GPQA Diamond and 65.8% on SWE-Bench Verified.

## Facts

| Field | Value |
| --- | --- |
| Model | Kimi K2 (0905) |
| Developer | Moonshot AI |
| Release date | Friday, Sep 5 2025 |
| Licensing | Open Weight |
| Parameters | 1T |
| Context window | 256k |

## Benchmark scores published at release

| Benchmark | Score | What it measures |
| --- | --- | --- |
| SWE-Bench Verified | 65.8% | Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. |
| GPQA Diamond | 75.1% | Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. |

## Questions and answers

### When was Kimi K2 (0905) released?

Kimi K2 (0905) was released by Moonshot AI on Friday, Sep 5 2025.

### Who made Kimi K2 (0905)?

Kimi K2 (0905) was built by Moonshot AI. Chinese AI company building the Kimi family of models. Founded in 2023, known for long-context and efficient MoE architectures.

### What benchmark scores did Kimi K2 (0905) get?

Kimi K2 (0905) reports 2 tracked benchmark scores — SWE-Bench Verified: 65.8%; GPQA Diamond: 75.1%. Scores are the figures published at release by Moonshot AI.

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

Kimi K2 (0905) has a context window of 256k. That is the maximum amount of input plus output the model can hold in a single request.

### How many parameters does Kimi K2 (0905) have?

Kimi K2 (0905) is reported at 1T parameters.

### Is Kimi K2 (0905) open source?

Partly. Kimi K2 (0905) is an open-weight model: the trained weights are free to download and run locally or on your own infrastructure, but the training data and code are not fully released and the license may restrict some commercial uses. It is not open source in the strict sense.

### What came before and after Kimi K2 (0905)?

Moonshot AI's previous tracked release was Kimi K2 on Jul 11 2025, 56 days earlier. It was followed by Kimi Linear on Oct 30 2025.


---

Canonical page: https://aireleasetracker.com/model/moonshot/kimi-k2-(0905)
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.