OLMo 2 1B Instruct
OLMo 2 1B Instruct is AllenAI's 1-billion-parameter instruct model from the April 2025 OLMo 2 release, post-trained with RLVR on math. It is fully open: weights, training data, training code, and intermediate checkpoints are all Apache-2.0 licensed.
The right SLM for one audience: researchers and auditors who need a model whose training set is fully published. The only model in this list where you can answer 'what did it see during training' precisely.
Overview
OLMo 2 1B Instruct is AllenAI's 1-billion-parameter instruct model from the April 2025 OLMo 2 release, post-trained with RLVR on math. It is fully open: weights, training data, training code, and intermediate checkpoints are all Apache-2.0 licensed.
Strengths
- Fully reproducible: data, code, weights, and checkpoints all open
- RLVR-on-math post-training gives unusually strong arithmetic for the size
- Apache-2.0 with no usage restrictions
- Backed by AllenAI's stable, ongoing OLMo release cadence
Weaknesses
- 4096-token context is the shortest of any model in this list
- English-only — no multilingual capability worth speaking of
- Weak on general chat compared to Qwen3-0.6B despite being larger
- Tiny community presence outside academia (~62K downloads)
Quantization variants
Each quantization trades model quality for file size and VRAM. Q4_K_M is the most popular starting point.
| Quantization | File size | VRAM required |
|---|---|---|
| Q4_K_M | 0.6 GB | 1 GB |
Get the model
HuggingFace
Original weights
Source repository — direct quantization required.
Hardware that runs this
Cards with enough VRAM for at least one quantization of OLMo 2 1B Instruct.
Models worth comparing
Same parameter band, plus what's one tier above and below — so you can decide what actually fits your hardware.
Frequently asked
What's the minimum VRAM to run OLMo 2 1B Instruct?
Can I use OLMo 2 1B Instruct commercially?
What's the context length of OLMo 2 1B Instruct?
Source: huggingface.co/allenai/OLMo-2-0425-1B-Instruct
Reviewed by RunLocalAI Editorial. See our editorial policy for how we research and verify model claims.
Related — keep moving
Verify OLMo 2 1B Instruct runs on your specific hardware before committing money.