Mistral AI logo

Devstral 2

Mistral AIOpen WeightsPending Human Review

Devstral 2 is a state-of-the-art, open-weight agentic coding model developed by Mistral AI. Released in December 2025, it features a dense Transformer architecture with 123 billion parameters and a 256k token context window. Designed specifically for software engineering tasks, Devstral 2 excels at codebase exploration, multi-file editing, and complex instruction following. It supports multimodal inputs (text, code, and images) and is optimized for agentic workflows, achieving a score of 72.2% on the SWE-bench Verified benchmark. The model is released alongside the Mistral Vibe CLI for terminal-based code automation. While the weights are publicly available, the 123B model is distributed under a Modified MIT license with commercial restrictions for large entities.

2025-12-09
123B
Dense Transformer
Modified MIT

Specifications

Parameters
123B
Architecture
Dense Transformer
License
Modified MIT
Context Window
262,144 tokens
Max Output
262,144 tokens
Training Data Cutoff
Feb 2024
Type
multimodal
Modalities
textcodeimage

Benchmark Scores

Advanced Specifications

Model Family
Devstral
Finetuned From
null
API Access
Available
Chat Interface
Available
Multilingual Support
Yes
Variants
Devstral 2 (123B)Devstral Small 2 (24B)Devstral 2 InstructDevstral Small 2 Instruct
Hardware Support
NVIDIA H100 (Minimum 4x for 123B)NVIDIA A100NVIDIA RTX 4090 (for Devstral Small 2)

Capabilities & Limitations

Capabilities
agentic codingmulti-file editingcodebase explorationreasoningvision-to-codetool usefunction callingstructured output
Known Limitations
High hardware requirements for 123B model (requires data center GPUs)Knowledge cutoff (Feb 2024) may limit awareness of very recent librariesCommercial use restriction for companies with >$20M monthly revenue (Modified MIT license)
Notable Use Cases
software engineering agentsautomated bug fixinglegacy system modernizationrepository-level code refactoringterminal-based coding assistance (via Vibe CLI)
Function Calling Support
Yes
Tool Use Support
Yes

Related Models