Mistral Medium 3.5 Now Available in Puter.js with Free, Unlimited Access
Key Takeaways
- ▸Mistral Medium 3.5, a 128B-parameter multimodal model, consolidates three previous Mistral models into a single release with 256K context window and vision capabilities
- ▸Available free through Puter.js with no API keys or infrastructure requirements needed, significantly lowering barriers to entry
- ▸Flexible reasoning_effort parameter allows dynamic switching between fast inference and deeper reasoning within a single model
Summary
Mistral AI has made its new flagship Mistral Medium 3.5 model available through Puter.js, a platform providing free, unlimited access to the model without requiring API keys or infrastructure setup. Mistral Medium 3.5 is a 128B-parameter multimodal model with a 256K context window that consolidates three previous Mistral models (Medium 3.1, Magistral, and Devstral 2) into a single unified release, designed to excel at instruction-following, reasoning, and agentic coding tasks.
The model includes native function calling, structured JSON output, and vision capabilities powered by a custom-trained encoder that handles variable image sizes. A key feature is the per-request reasoning_effort parameter, which allows developers to dynamically toggle between fast responses and deeper chain-of-thought processing, enabling the same model to serve both quick chat applications and complex, long-horizon agentic workflows.
Puter.js integration requires minimal setup—just a single npm install or script tag—making Mistral Medium 3.5 immediately accessible to developers without API management overhead. The model achieves strong benchmark performance with 77.6% on SWE-Bench Verified and 91.4% on τ³-Telecom, positioning it as a capable option for coding and reasoning-intensive applications.
- Strong benchmark performance (77.6% on SWE-Bench Verified) demonstrates competitive capabilities for coding and complex reasoning tasks
