Mistral AI has launched Devstral 2, a next-generation open-source coding model available in two variants: Devstral 2 (123 billion parameters) and Devstral Small 2 (24 billion parameters). Both models are open to the public, with Devstral 2 accessible for free via API and Devstral Small 2 available for both API access and local deployment. The models target developers, enterprises, and individual users who require high-performance code generation and automation tools.
BREAKING 🚨: Mistral AI released Devstral 2 (123B) and Devstral Small (24B) open models, along with Mistral Vibe, a new CLI tool for coding. https://t.co/zbCq0sdcZL pic.twitter.com/R9J9FFlOFR
— TestingCatalog News 🗞 (@testingcatalog) December 9, 2025
Devstral 2 achieves a 72.2% score on SWE-bench Verified, establishing itself as a top performer among open-weight code models. It is up to seven times more cost-efficient than some leading proprietary models, such as Claude Sonnet, for real-world coding tasks. The 256K context window allows the model to track large codebases and dependencies, orchestrate multi-file changes, and support advanced features like failure detection and retry mechanisms. Devstral Small 2, despite its compact size, achieves competitive benchmarks and can run on consumer-grade hardware, supporting both image inputs and multimodal agent use cases.
The models are released under permissive licenses: Devstral 2 under a modified MIT license and Devstral Small 2 under Apache 2.0. Deployment requirements for Devstral 2 include a minimum of four H100-class GPUs, while Devstral Small 2 supports single-GPU and even CPU-only setups, making it accessible to a wide audience.
Industry experts and early users, including open agent platforms like Cline and Kilo Code, have reported strong adoption and high tool-calling success rates, noting Devstral 2's ability to match or outperform larger proprietary competitors in several benchmarks. These reactions endorse the model's performance and cost advantages for a broad range of coding tasks.
Mistral AI, the company behind these releases, focuses on developing open-source AI models that enable distributed intelligence. With this release, the company continues its strategy of providing state-of-the-art tools for code automation while maintaining transparency and accessibility. The introduction of Mistral Vibe CLI further extends these capabilities, offering a native command-line interface for code automation, project-aware context handling, and multi-file orchestration for software engineering workflows.
