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Codestral Mamba

Mistral's 7B Mamba-architecture coding model — linear-time inference, 256k context, Apache 2.0

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freeDR 86Open weights on Hugging Face (mistralai/mamba-codestral-7B-v0.1) — free to download and self-host under Apache 2.0. Also available via Mistral La Plateforme API as codestral-mamba-2407 alongside Codestral 22B. Deploy locally via mistral-inference SDK or TensorRT-LLM.View full pricing →

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https://mistral.ai/news/codestral-mamba

About Codestral Mamba

Mistral AI's 7B Mamba-architecture coding model released July 2024. Unlike transformer-based models, Codestral Mamba uses a state space model (SSM) backbone for linear-time inference — meaning latency doesn't grow with context length. Tested up to 256k tokens in-context. Performs on par with SOTA transformer models on code benchmarks at release. Open weights on Hugging Face under Apache 2.0. Available on La Plateforme as codestral-mamba-2407. Co-designed with Mamba authors Albert Gu and Tri Dao.

Key Features

Mamba (SSM) architecture: linear-time inference — response latency stays flat as context length grows
256k-token in-context retrieval tested — handles full codebases in a single context window
7,285,403,648 parameters — instructed model optimized for code generation and reasoning
Performs on par with SOTA transformer-based models on code benchmarks at release (July 2024)
Apache 2.0 license — full commercial use, fine-tuning, and redistribution permitted
Available on Mistral La Plateforme as codestral-mamba-2407 — no self-hosting required for testing
Deploy via mistral-inference SDK, TensorRT-LLM, or llama.cpp (community support)
Download raw weights from Hugging Face — compatible with local inference pipelines
Co-designed with Mamba authors Albert Gu and Tri Dao — architecturally grounded in SSM research

Codestral Mamba Pros & Cons

Pros

  • +Linear-time inference is a genuine architectural advantage: no KV-cache quadratic blowup with long contexts
  • +256k context in a 7B model was exceptional at release — fits large codebases in one prompt
  • +Apache 2.0 is the most permissive open-source license — no restrictions on commercial use or redistribution
  • +Available via La Plateforme API (codestral-mamba-2407) without needing to self-host
  • +Architecturally interesting: open-weights Mamba model for research on SSM vs transformer trade-offs

⚠️ Cons

  • Superseded by Codestral 25.08 and Devstral for production coding use cases
  • Mamba architecture has less ecosystem tooling than transformer models (quantization, serving frameworks)
  • Benchmarks are from mid-2024; newer transformer models at 7B scale have surpassed it
  • Community llama.cpp support was not guaranteed at launch — check current support status for local inference

Who Is Codestral Mamba Best For?

👤Researchers studying Mamba/SSM architectures vs transformers on code generation tasks
👤Teams needing very long-context local code inference without KV-cache memory costs
👤Developers running resource-constrained local environments who need Apache 2.0 licensed coding models
👤Architecture experiments: ablations comparing linear-time SSM vs transformer at the 7B scale

Tags

mistralopen-sourcecodingmambassm7bllmself-hostedhuggingfacelocallong-context
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