Devstral
Mistral AIMistral's dedicated open-weight agentic coding model family, purpose-built for software engineering tasks including SWE-bench. The Small-2 (24B) instruct variant delivers competitive coding performance in a deployable size with 321K downloads. The larger Devstral-2-123B pushes frontier-class performance under a research license.
Devstral Small 1.1 (mistralai/Devstral-Small-2507), 24B dense agentic coding model, 128k context, built with All Hands AI; updated from Devstral Small 1.0 (2505). Agentic/coding post-trained SKU. Verified live on HF June 2026.
Openness
3 high confidence- weights
- open(Apache-2.0, on HF)
- data
- closed
- code
- partial(inference/serving
- license
- Apache-2.0(OSI permissive, no use restrictions)
Apache-2.0 open weights, but training/post-training data and pipeline undisclosed -> open_weights, not open_source.
- https://huggingface.co/mistralai/Devstral-Small-2507 recorded 2026-06-04
live card; license=apache-2.0; 24B agentic coding model; SWE-bench Verified 53.6%
Adoption
2 medium confidence~37k downloads last month for the Small-2507 SKU on HF; specialist coding-agent model with moderate uptake (OpenHands/coding-agent niche), not a mass-market chat model.
- https://huggingface.co/mistralai/Devstral-Small-2507 recorded 2026-06-04
~37,129 downloads last month
Capability
3 high confidenceBest open coding model in its release window at a small 24B size, but below 2026 frontier coders (Qwen3.6 27B 77.2, GLM-5.1, Kimi K2.6 80%+). Strong-for-size, mid-tier overall.
- https://huggingface.co/mistralai/Devstral-Small-2507 recorded 2026-06-04
SWE-bench Verified table: Devstral Small 1.1 = 53.6%, top open source
Unchanged since 2026-06-24 (last edited, not re-checked)