Mistral releases Medium 3.5 — 128B dense, 256k context, open weights

Mistral

Models / LLM official + media 5 src. ~1 min

Mistral AI introduced Mistral Medium 3.5 — a flagship dense model with 128B parameters, 256k context, and switchable reasoning effort. Weights are open under a modified MIT license and available on Hugging Face. In parallel, the company launched remote agents in Vibe (cloud coding sessions with CLI and "teleportation" of a local session into the cloud) and a Work mode in Le Chat for multi-step tasks. Claimed scores: 77.6% on SWE-Bench Verified and 91.4% on τ³-Telecom; API pricing is $1.5/$7.5 per million tokens.

Why it matters

Mistral returns to the frontier with a cheap open-weight model on par with Claude Sonnet 4.5 in coding, while also offering its own analog of Codex/Claude Code — the strongest European release of spring 2026.

Importance: 4/5

Open-weights flagship with frontier-tier benchmarks + ≥3 confirmations + a new class of remote agents from Mistral.

mistral mistral-medium-3-5 open-weights vibe le-chat swe-bench remote-agents coding-agents

Sources

official Mistral — Remote agents в Vibe на базе Mistral Medium 3.5

official Hugging Face — mistralai/Mistral-Medium-3.5-128B

official Mistral Docs — карточка модели Medium 3.5

media TestingCatalog — Medium 3.5 и Work Mode для Le Chat

secondary StartupFortune — Mistral and enterprise-grade open-weight AI