Devstral
2025-05-21 · Publisher : Mistral AI · Domain : Artificial Intelligence
Mistral AI and All Hands AI release Devstral, a 24 billion parameter agentic model for software engineering, under the Apache 2.0 license, which reaches 46.8% on SWE-Bench Verified.
What changes
- Model trained to solve real GitHub issues, usable with the OpenHands or SWE-Agent scaffolds.
- 46.8% on SWE-Bench Verified, more than 6 points above previous open models.
- Outperforms, under the same OpenHands scaffold, much larger models (DeepSeek-V3-0324 671B, Qwen3 232B-A22B) according to the vendor.
- Lightweight: an RTX 4090 or a 32 GB Mac is enough.
### Specifications - 24 billion parameters, fine-tuned from Mistral Small 3.1; 128k context; text only. - License: Apache 2.0. - Availability: API, Hugging Face, Ollama, Kaggle, Unsloth, LM Studio. - API identifier: `devstral-small-2505` (retired on 11/30/2025 according to the documentation). ### Pricing | Model | Input (USD / M tokens) | Output (USD / M tokens) | |---|---|---| | Devstral Small | 0.1 | 0.3 | ### Benchmarks Scores published by the vendor (SWE-Bench Verified): | Model | Scaffold | Score | |---|---|---| | Devstral | OpenHands | 46.8% | | Claude 3.5 Haiku | Anthropic | 40.6% | | SWE-smith-LM 32B | SWE-agent | 40.2% | | GPT-4.1-mini | OpenAI | 23.6% | ### Key takeaways An open source coding agent, able to run locally, suited to private repositories subject to security constraints. Released as a research preview.
Links
Tags : LLM, Mistral, Devstral, Code, Agents, Open Source, Apache 2.0