Read our How to Run Devstral 2 Guide!

Devstral 2 123B Instruct 2512

Devstral is an agentic LLM for software engineering tasks. Devstral 2 excels at using tools to explore codebases, editing multiple files and power software engineering agents.
The model achieves remarkable performance on SWE-bench.

This model is an Instruct model in FP8, fine-tuned to follow instructions, making it ideal for chat, agentic and instruction based tasks for SWE use cases.

For enterprises requiring specialized capabilities (increased context, domain-specific knowledge, etc.), we invite companies to reach out to us.

Key Features

The Devstral 2 Instruct model offers the following capabilities:

• Agentic Coding: Devstral is designed to excel at agentic coding tasks, making it a great choice for software engineering agents.
• Improved Performance: Devstral 2 is a step-up compared to its predecessors.
• Better Generalization: Generalises better to diverse prompts and coding environments.
• Context Window: A 256k context window.

Use Cases

AI Code Assistants, Agentic Coding, and Software Engineering Tasks. Leveraging advanced AI capabilities for complex tool integration and deep codebase understanding in coding environments.

Benchmark Results

*Benchmark results presented are based on publicly reported values for competitor models.

Usage

Scaffolding

Together with Devstral 2, we are releasing Mistral Vibe, a CLI tool allowing developers to leverage Devstral capabilities directly in your terminal.

• Mistral Vibe (recommended): Learn how to use it here

Devstral 2 can also be used with the following scaffoldings:

• Cline
• Kilo Code
• Claude Code
• OpenHands
• SWE Agent

You can use Devstral 2 either through our API or by running locally.

Mistral Vibe

The Mistral Vibe CLI is a command-line tool designed to help developers leverage Devstral’s capabilities directly from their terminal.

We recommend installing Mistral Vibe using uv for faster and more reliable dependency management:

uv tool install mistral-vibe

You can also run:

curl -LsSf https://mistral.ai/vibe/install.sh | sh

If you prefer using pip, use:

pip install mistral-vibe

To launch the CLI, navigate to your project's root directory and simply execute:

vibe

If this is your first time running Vibe, it will:

• Create a default configuration file at ~/.vibe/config.toml.
• Prompt you to enter your API key if it's not already configured, follow these instructions to create an Account and get an API key.
• Save your API key to ~/.vibe/.env for future use.

Local Deployment

The model can also be deployed with the following libraries, we advise everyone to use the Mistral AI API if the model is subpar with local serving:

• vllm (recommended): See here
• transformers: See here

Coming soon:

• llama.cpp
• ollama
• lmstudio

Current llama.cpp/ollama/lmstudio implementations may not be accurate, we invite developers to test them via the following prompt tests.

vLLM (recommended)

Transformers

Tests

To help test our model via vLLM or test that other frameworks' implementations are correct, here is a set of prompts you can try with the expected outputs.

1. Call one tool

2. Call tools one at a time subsequently

3. Long context

4. Chatting tech

5. Small talk

Run the examples above with the following python script which assumes there is an OpenAI compatible server deployed at localhost:8000:

License

This model is licensed under a Modified MIT License.

You must not use this model in a manner that infringes, misappropriates, or otherwise violates any third party’s rights, including intellectual property rights.

Base model

mistralai/Devstral-2-123B-Instruct-2512

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