# Moonshot AI Kimi K2 Thinking — deprecation status

> Yes — Kimi K2 Thinking is retired. Moonshot AI shut it down on May 25, 2026; API requests to it now fail. The recommended replacement is Kimi K2.6.

Moonshot's reasoning K2, able to run hundreds of sequential tool calls without losing the thread, and the model that put an open-weights system at the top of several agentic leaderboards in late 2025. Its id was retired on 25 May 2026 once thinking became a mode on the general models rather than a separate name.

## Facts

| Field | Value |
| --- | --- |
| Provider | Moonshot AI |
| Model id | `kimi-k2-thinking` |
| Status | Retired |
| Shutdown | May 25, 2026 (70 days ago) |
| Last verified | August 3, 2026 |

## Replacement

- **Kimi K2.6** (`kimi-k2.6`) · recommended — https://modeldeprecations.dev/moonshot/kimi-k2.6
  - K2.6 has a thinking mode you turn on per request. The response shape differs from this id's, so anything parsing reasoning content out of the body needs checking.
  - Parameters it accepts: https://modelparams.dev/models/moonshot/kimi-k2.6

```diff
- "model": "kimi-k2-thinking"
+ "model": "kimi-k2.6"
```

## FAQ

### When did Moonshot AI Kimi K2 Thinking shut down?

Moonshot AI Kimi K2 Thinking shut down on May 25, 2026. API requests to it fail from that date onward.

### What replaces Moonshot AI Kimi K2 Thinking?

Moonshot AI recommends Kimi K2.6 (`kimi-k2.6`) as the replacement for Moonshot AI Kimi K2 Thinking. K2.6 has a thinking mode you turn on per request. The response shape differs from this id's, so anything parsing reasoning content out of the body needs checking.

### Is Moonshot AI Kimi K2 Thinking still available?

No. Moonshot AI Kimi K2 Thinking is retired and no longer served — it was shut down on May 25, 2026. Calls to it return an error.

### How do I migrate from Moonshot AI Kimi K2 Thinking to kimi-k2.6?

Swap the model id in your API call: replace "kimi-k2-thinking" with "kimi-k2.6". K2.6 has a thinking mode you turn on per request. The response shape differs from this id's, so anything parsing reasoning content out of the body needs checking.

## Sources

- [Kimi model list](https://platform.kimi.ai/docs/models) — accessed 2026-08-03

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Canonical page: https://modeldeprecations.dev/moonshot/kimi-k2-thinking
JSON: https://modeldeprecations.dev/api/v1/models/moonshot/kimi-k2-thinking.json