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Capability gains

Mistral releases a cyber-capable Large 4 preview ahead of planned weight release

Mistral opened the Large 4 preview API on 6 October. Its launch reports strong cyber and agentic benchmarks and gives vetted red-team partners reduced moderation and expanded cyber access. Public weights are planned for later in October, not yet verified as released. Benchmark findings do not establish a real-world breach or job displacement.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM40confidence 60/100

Why it moved the index

A released general-purpose model with strong cyber and tool-workflow performance directly broadens access to consequential agent capabilities. Magnitude 40 reflects the preview and restricted red-team access, not a completed open-weight release. Confidence 60 reflects developer-reported evaluations and one inference from task capability to increased dual-use capacity; refusals and prompt-injection resistance offer countervailing safeguards. Controlled challenges are not external attacks.

Assessment history

  1. R1
    Toward 40 · confidence 60

    New dated public-preview launch with cyber and agentic evidence, distinct from earlier Mistral versions; planned weight release is not counted as completed.

    07 Oct 2026

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  1. DoomBench assesses “Mistral releases a cyber-capable Large 4 preview ahead of planned weight release” as evidence moving toward doom, with magnitude 40 and confidence 60 out of 100 in the capability gains category.

  2. The DoomBench assessment of “Mistral releases a cyber-capable Large 4 preview ahead of planned weight release” is based on reporting from Mistral AI and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “Mistral releases a cyber-capable Large 4 preview ahead of planned weight release” as follows: Mistral opened the Large 4 preview API on 6 October. Its launch reports strong cyber and agentic benchmarks and gives...

    https://www.doombench.com/news/mistral-releases-a-cyber-capable-large-4-preview-ahead-of-planned-weight-release-2026-10-06