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#open-weight
Stories connected through a shared idea, actor, technology or theme.
Mistral opens public preview of trillion-parameter Large 4 modelMistral Large 4 is a natively multimodal mixture-of-experts model with about 1.05 trillion total parameters and 52 billion active parameters. The preview supports a one-million-token context window, while model weights are planned for later release.→Harvey raises $550 million and expands its legal-AI stackHarvey said the round was co-led by Lightspeed and Diffusion and would support proprietary model development and enterprise expansion. The company also introduced a post-trained open-weight model and Harvey LAB benchmark, while reporting coverage said it acquired agent-security startup Guardrails AI.→Z.ai delays GLM-5.3 weights over cyber capabilitiesZ.ai said GLM-5.3 showed unusually strong performance on vulnerability discovery and exploit-development benchmarks. The company plans controlled access for selected security partners before delaying public weights for two weeks.→Open-weight AI faces a new US government scrutiny debateThe current US AI framework excludes released open models from its definition of covered frontier models. Axios reported discussion of pre-release review, national-security evaluation and procurement standards for powerful open-weight systems.→Z.ai delays GLM-5.3 weights over cyber capabilitiesZ.ai said GLM-5.3 reached unusually strong performance on vulnerability discovery and exploit-development benchmarks. The company will initially provide controlled access to selected security partners and delay public weights for two weeks.→Open-weight AI faces a new US government scrutiny debateThe current US AI framework excludes released open models from its definition of covered frontier models. Axios reported that officials and industry participants are nevertheless discussing pre-release review, national-security evaluation and procurement standards for powerful open-weight systems.→