MBZUAI's Institute of Foundation Models released K2 Horizon 375B A23B on 3 September 2026. The model is open weights and published under the Apache 2.0 licence, which permits commercial use. Weights are available on Hugging Face for self-hosting. It handles text input and text output only, with no image support. The model uses extended step-by-step reasoning before answering. It is a mixture-of-experts design, so only part of its parameters run per token. Artificial Analysis scored it 47 on its Intelligence Index, ranking 11th of 112 comparable models. It also used fewer output tokens than the median for its class. Artificial Analysis lists no speed or price figures, as the model is self-hosted rather than sold through a first-party API.
What it unlocks
Self-hosting a high-scoring open-weights reasoning model under Apache 2.0.
- 47 on Intelligence Index (median 29)
- #11 of 112 in its class
- 375B total, 23B active parameters
- 524k token context window
What you need to act on it
- self-hosting infrastructure or a third-party provider
Sources