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Medium Reasoning

Devstral Medium

Devstral Medium is a high-performance code generation and agentic reasoning model that achieves 61.6% on SWE-Bench Verified, surpassing GPT-4.1 and Gemini 2.5 Pro on coding tasks at a fraction of the cost. Designed for enterprise use with a 131,072 token context window, it delivers superior accuracy and reasoning capabilities for complex software engineering challenges via API deployment.

256k Context
Medium Intelligence
Jun '25 Knowledge

Available for Chat, Vision, and File Uploads.

Performance Benchmarks

MMLU Pro
70.8%
HLE
3.8%
LiveCodeBench
33.7%

How do you want to interact?

Start a Conversation

Ask anything.
Have a natural conversation, brainstorm ideas, draft emails, or ask for advice.

Start Chatting

Use a Persona

Specialized Experts.
Instruct the AI to act as a Coding Tutor, Marketing Expert, or Travel Guide.

Pick a Persona

Why use Devstral Medium?

Agentic Coding

Excels at solving complex software engineering tasks like GitHub issues in large codebases using agent scaffolds

On-Premise Deployment

Supports direct deployment on private infrastructure for enhanced data privacy and control

Custom Finetuning

Enables enterprises to tailor the model for specific use cases and optimal performance

Capability Examples

Codebase Exploration
Explore this Python codebase and suggest optimizations for the main function in file.py: [paste code here]
After analyzing the codebase, the main function in file.py has O(n^2) complexity due to nested loops. Optimize by using a hashmap for O(n) lookup: python def main(arr): seen = {} for num in arr: if num in seen: return True seen[num] = True return False This reduces time by 90% on large inputs.
Multi-File Editing
Using tools, fix bug in auth.py affecting login in app.js across the repo. Describe changes.
Tool call: read_file(auth.py) -> Found missing token validation. Tool call: edit_file(auth.py) -> Added if not token: raise AuthError(). Tool call: edit_file(app.js) -> Updated login() to pass token. Bug fixed: validation now prevents unauth access. Commit summary: "Fix auth token validation".

How to use

1
Go to Chat

Navigate to the "AI Chat" page.

2
Select Model

Ensure Devstral Medium is selected.

3
Type Prompt

Ask a question or paste code.

4
Interact

Refine the answer by replying to the AI.

Compare LLMs Side-by-Side

Is Devstral Medium better than Claude 3.5 or Gemini? Test same prompts simultaneously in the Chat Playground.

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