K2 Horizon Models by MBZUAI
Last refreshed 2026-09-07. Next refresh: weekly.
Details
Capabilities
About
K2 Horizon is the Institute of Foundation Models (IFM / MBZUAI) open-weight fleet of six foundation language models released September 3, 2026: sparse MoE flagship 375B-A23B (23B active), MoVA-36B-A4B (Mixture-of-Value-Attention MoE, 4B active), dense 32B, 7B, 3.7B, and 0.9B. First-party IFM blog and Hugging Face IFM/K2-Horizon-* cards document Apache 2.0 weights, native long context (512K on five sizes; 128K on 0.9B), reasoning and tool-call parsers, and day-zero vLLM/SGLang/Ollama serving.
Decision facts
- Best fit
- agenticreasoningJSON / Tool use
- Capability starting point
- K2 Horizon 7B with 512K context and reasoning, JSON / Tool use, and structured outputs
- Lowest tracked input
- Not tracked
- Closest related family
- Agents-A1
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
Use when the workload needs agentic, 128K context, and 900M parameters.
Use when the workload needs agentic, 512K context, and 3.7B parameters.
Use when the workload needs agentic, 512K context, and 32B parameters.
Use when the workload needs agentic, 512K context, and reasoning.
Use when the workload needs agentic, 512K context, and 7B parameters.
Use when the workload needs agentic, 512K context, and reasoning.
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| K2 Horizon 0.9B | Use when the workload needs agentic, 128K context, and 900M parameters. | 2026-09 | agentic128K context900M parameters | Current |
| K2 Horizon 3.7B | Use when the workload needs agentic, 512K context, and 3.7B parameters. | 2026-09 | agentic512K context3.7B parameters | Current |
| K2 Horizon 32B | Use when the workload needs agentic, 512K context, and 32B parameters. | 2026-09 | agentic512K context32B parameters | Current |
| K2 Horizon 375B A23B | Use when the workload needs agentic, 512K context, and reasoning. | 2026-09 | agentic512K contextreasoning | Current |
| K2 Horizon 7B | Use when the workload needs agentic, 512K context, and 7B parameters. | 2026-09 | agentic512K context7B parameters | Current |
| K2 Horizon MoVA 36B A4B | Use when the workload needs agentic, 512K context, and reasoning. | 2026-09 | agentic512K contextreasoning | Current |
Release Timeline
1 release groupSpecifications(6 models)
| Model | Released | Context | Parameters | Reasoning | JSON / Tool use | Structured Outputs |
|---|---|---|---|---|---|---|
| K2 Horizon 0.9B | 2026-09 | 128K | 0.9B | Yes | Yes | Yes |
| K2 Horizon 3.7B | 2026-09 | 512K | 3.7B | Yes | Yes | Yes |
| K2 Horizon 32B | 2026-09 | 512K | 32B | Yes | Yes | Yes |
| K2 Horizon 375B A23B | 2026-09 | 512K | 375B (23B active) | Yes | Yes | Yes |
| K2 Horizon 7B | 2026-09 | 512K | 7B | Yes | Yes | Yes |
| K2 Horizon MoVA 36B A4B | 2026-09 | 512K | 36B (4B active) | Yes | Yes | Yes |
Models(6)
K2 Horizon 0.9B
K2 Horizon 3.7B
K2 Horizon 32B
K2 Horizon 375B A23B
K2 Horizon 7B
K2 Horizon MoVA 36B A4B