Model library / IFM
K2-Horizon-3.7B is a 3.7 billion-parameter dense decoder-only model with a 512 K token context, released openly by IFM.
Parameters in total
Context length in tokens, as published
Weights at the released precision
Licence declared on the repository
Overview
K2-Horizon-3.7B is a dense decoder-only language model with 3.7 billion parameters, released by IFM. The publisher describes it as a strong small-model baseline evaluated on agentic, coding and reasoning benchmarks, and notes that it provides a 512 K token context window and fully open training data and code.
In deployment the model occupies roughly 5.1 billion parameters stored in bfloat16 format, fitting within the memory limits of modern GPUs. It accepts up to 524,288 tokens per request, enabling long-range tasks, and is distributed under the Apache-2.0 licence, allowing unrestricted commercial and research use.
Specification
| Repository | IFM/K2-Horizon-3.7B |
| Publisher | IFM |
| Published | 2 September 2026 |
| Architecture | K2HorizonForCausalLM |
| Model type | k2_horizon |
| Parameters | 5,058,255,360 |
| Layers | 36 |
| Hidden size | 2,560 |
| Attention heads | 32, 8 key/value heads |
| Context length | 524,288 tokens |
| Vocabulary | 250,624 tokens |
| Weight format | bfloat16 |
| Licence | apache-2.0 |
Memory
Parameter count multiplied by the bytes each format uses. The key-value cache comes on top.
| Precision | Weights | Notes |
|---|---|---|
| bf16 | 9.4 GiB | Full precision as released |
| fp8 | 4.7 GiB | 8-bit, near-lossless on most models |
| int4 | 2.4 GiB | 4-bit, smallest footprint |
The cache costs 144 KiB per token at 16-bit, so the full 524,288-token context of one request needs about 72.0 GiB. Concurrency multiplies that number, not the weights.
Hardware
At the released precision, with 90% of the card given to the server and 2.5 GiB kept for the runtime. The context column is what is left for the cache on that setup.
| GPU | Cards needed | Free for cache | Context it holds |
|---|---|---|---|
| RTX 4090 24GB | 1 | 9.7 GiB | about 70,474 tokens |
| RTX 5090 32GB | 1 | 16.9 GiB | about 122,903 tokens |
| L40S 48GB | 1 | 31.3 GiB | about 227,761 tokens |
| A100 80GB | 1 | 60.1 GiB | about 437,476 tokens |
| H100 80GB | 1 | 60.1 GiB | about 437,476 tokens |
| RTX PRO 6000 96GB | 1 | 74.5 GiB | the full 524,288 tokens |
| H200 141GB | 1 | 115.0 GiB | the full 524,288 tokens |
Serving
A vLLM launch line for the shape above. Check the model card for a runtime the publisher recommends.
vllm serve IFM/K2-Horizon-3.7B \ --max-model-len 69632 \ --gpu-memory-utilization 0.90
Questions
The weights take about 9 GiB at the released precision. That fits on one RTX 4090 24GB, which leaves roughly 10 GiB for the key-value cache.
The repository declares apache-2.0. Read the licence text before commercial use: the name alone does not tell you what is allowed.
The configuration allows 524,288 tokens. Whether the whole window is usable depends on the memory left for the cache, which the hardware table works out per card.
This page is a reference, and Aiqre does not serve this model today. We deploy open-weight models on dedicated EU hardware on request, so if you want an OpenAI-compatible endpoint for it, email [email protected] with the model name and roughly what volume you expect.
Also in the library
K2-Horizon-375B-A23B is an open-weight sparse MiE language model from IFM with 379 B parameters, 23 B active per token and a 512 …
K2-Horizon-7B is a 9-billion-parameter decoder-only language model with a 524k token context window, released under Apache-2.0.
K2-Horizon-32B-Stage1 is a 32-billion-parameter dense decoder-only model released by IFM for benchmarking agentic, coding and rea…
K2-Horizon-MoVA-36B-A4B is a sparse Mixture-of-Experts language model with MoVA attention, released by IFM.
Hosting
Tell us the model and roughly what volume you expect. We reply with a price and an OpenAI-compatible endpoint, with your prompts never stored.