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Moonshot AIKimi K2 familyRetiredReasoning modelReleased Nov 2025

Kimi K2 Thinking

Landmark open-weight thinking agent (Nov 2025). Use for self-hosting or research; for API use kimi-k3 or kimi-k2.6.

Model idkimi-k2-thinking / kimi-k2-thinking-turbo

PricePrice not published

Checked29 September 2026

No published training cutoff

At least1,970events since its release in November 2025

85 historic, 450 major. 348 days of news.

Moonshot AI doesn’t publish a training cutoff, so we count from its release date. The real gap is larger. Coverage before 2026 is thin (80 entries for 2025), so this count is a floor.

How to call it

3 ways to use Kimi K2 Thinking, with the model id each provider expects.

Providers, model ids, endpoints and docs for Kimi K2 Thinking
ProviderModel idEndpointDocs
Kimi API (discontinued) kimi-k2-thinking / kimi-k2-thinking-turbo https://api.moonshot.ai/v1 platform.kimi.ai
OpenRouter moonshotai/kimi-k2-thinking openrouter.ai
Hugging Face huggingface.co

Pricing

Price not published.

No price source linked. Checked 29 September 2026.

Specs

Input
Text
Output
Text
Context window
262,144 tokens
Max output
Not published
Open weights
Yes
Licence
Modified MIT
Training cutoff
Not published
Released
November 2025
Status
Retired
Type
Reasoning model

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • Long tool-call chains

    Interleaves reasoning with function calls and stays coherent across 200-300 sequential tool calls (vs 30-50 for earlier models, per Moonshot).

    Source: huggingface.co

  • Native INT4 via quantization-aware training

    QAT in post-training gives a lossless ~2x speed-up at INT4 on a 1T/32B-active MoE.

    Source: huggingface.co

  • Heavy mode

    Parallel 8-trajectory rollout with reflective aggregation used for top benchmark results (HLE, BrowseComp).

    Source: huggingface.co

Notes

kimi-k2 series (incl. K2 Thinking, K2-0905, K2-0711) discontinued on the Kimi API on 2026-05-25; Moonshot recommends kimi-k3. Still available as open weights and via third parties.

Sources: https://huggingface.co/moonshotai/Kimi-K2-Thinking · https://platform.kimi.ai/docs/models

Not yet checked against an official source: Pricing not verified.