Mistral AI and All Hands AI: Devstral coding-agent trajectory training

What changed

Specialized an open language model for repository-level software agents using test-checked environment trajectories, two-stage quality filtering and further policy optimization within an established coding-agent scaffold.

Scientific scope

Specialized an open language model for repository-level software agents using test-checked environment trajectories, two-stage quality filtering and further policy optimization within an established coding-agent scaffold. OpenHands/CodeAct, SWE-Gym, vLLM and existing model architecture are inherited. The integrated training/resource is acquired, not invention of autonomous coding agents. Evaluation depends on scaffold, retry protocol, budgets and tests. Credited lists repeat one name and contain merged fields; individual identity/effort is unresolved.

Evidence

The linked original sources describe the stated contribution and its evidence limits. WRS has not independently rerun the experiments or certified a proof. OpenHands/CodeAct, SWE-Gym, vLLM and existing model architecture are inherited. The integrated training/resource is acquired, not invention of autonomous coding agents. Evaluation depends on scaffold, retry protocol, budgets and tests. Credited lists repeat one name and contain merged fields; individual identity/effort is unresolved.

Contributors

• Source-listed authors and technical contributors · SCIENCE: Source-listed authors or explicitly credited technical contributors for the cited versions. Family entries retain source-specific attribution; a combined list is not one original-paper byline or equal individual work. Names alone do not establish resolved identities.

• Devstral: Fine-tuning Language Models for Coding Agent Applications
• Mistral AI and All Hands AI: Devstral coding-agent trajectory training — official institutional account

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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