# K2 V2

K2-V2 is built for research, fine-tuning, and long-context work.

**K2-Think-V2** API access retired on **3 October 2026**. Please migrate to **IFM/K2-Horizon-375B-A23B**. Model weights remain available on Hugging Face. See [Deprecation](https://docs.ifm.ai/docs/deprecation.md) for migration steps.

- **Weights license:** Apache 2.0
- **Hugging Face collection:** [IFM/K2-V2](https://huggingface.co/collections/IFM/k2-v2)

## Model series

The K2-V2 collection ships a base model (for research), an instruction-tuned variant (aligned, conversational), and a reasoning-focused release. Only K2-Think-V2 was served on the hosted API, and that access ends 3 October 2026; all weights stay open. [Explore the collection on Hugging Face →](https://huggingface.co/collections/IFM/k2-v2)

| Model | Type | Params | Context | API | Weights |
| --- | --- | --- | --- | --- | --- |
| K2-Think-V2 | Reasoning | 70B | 128K | No | [View](https://huggingface.co/IFM/K2-Think-V2) |
| K2-V2-Instruct | SFT / aligned | 70B | 128K | No | [View](https://huggingface.co/IFM/K2-V2-Instruct) |
| K2-V2 | Base (pretrained) | 70B | 128K | No | [View](https://huggingface.co/IFM/K2-V2) |

## Intended use

- Research on large language models and reasoning.
- Downstream fine-tuning — instruction following, agents, domain models.
- Long-context architecture experiments.
- Open, reproducible benchmarking of LLM scaling.

For aligned conversational use and any production traffic, use [K2 Horizon](https://docs.ifm.ai/docs/introduction.md) (see [Deprecation](https://docs.ifm.ai/docs/deprecation.md)).

_Last updated: October 14, 2026_