Mistral AI logo

Mistral Medium 3.5

Multimodal
Mistral AI

Mistral Medium 3.5 is Mistral's 128B open-weight reasoning model released in April 2026 under the Modified MIT License. It excels at constrained generation (COLLIE) and agentic telecom support tasks, with a 256K token context window.

Key Specifications

Parameters
128.0B
Context
256.0K
Release Date
April 29, 2026
Average Score
87.8%

Timeline

Key dates in the model's history
Announcement
April 29, 2026
Last Update
August 27, 2026

Technical Specifications

Parameters
128.0B
Training Tokens
-
Knowledge Cutoff
-
Family
-
Capabilities
MultimodalZeroEval

Pricing & Availability

Input (per 1M tokens)
$1.50
Output (per 1M tokens)
$7.50
Max Input Tokens
256.0K
Max Output Tokens
256.0K
Supported Features
Function CallingStructured OutputCode ExecutionWeb SearchBatch InferenceFine-tuning

Benchmark Results

Model performance metrics across various tests and benchmarks

Programming

Programming skills tests
SWE-Bench Verified
SWE-Bench Verified. reasoning_effort="high".Self-reported
78.0%

Other Tests

Specialized benchmarks
COLLIE
Collie. reasoning_effort="high".Self-reported
96.0%
Tau3 Telecom
τ³-Telecom. reasoning_effort="high". User simulator: gpt-5.2 (reasoning_effort=low). 4 trials.Self-reported
91.0%
AIME 2025
AIME 2025 avg@16. reasoning_effort="high".Self-reported
86.0%

License & Metadata

License
modified_mit_license
Announcement Date
April 29, 2026
Last Updated
August 27, 2026

Similar Models

All Models

Recommendations are based on similarity of characteristics: developer organization, multimodality, parameter size, and benchmark performance. Choose a model to compare or go to the full catalog to browse all available AI models.