Open source

AIMistral announced Mistral Large 4, a natively multimodal model with 1T parameters and 49B active parameters. It is available via API today, with open weights planned for the end of October. Clément Delangue, Hugging Face's CEO, reacted by noting that the model cannot be the best open-weight model until its weights are actually released.

Why it matters: The quoted announcement gives the parameter scale, active count, and availability path, which help readers compare it with other open-weight releases.

AIThinking Machines argues that safe open-weight releases depend on both model safety testing and readiness of the surrounding ecosystem, and that release should proceed in iterative stages. For its Inkling and Inkling-Small models, internal evaluations, four external red-teaming groups, and adversarial fine-tuning tests led the company to conclude that releasing the weights was not likely to add material risk beyond existing open-weight models.

Why it matters: The post lays out a staged, evidence-gated path to releasing open weights, with concrete safety tests and the ecosystem measures behind each stage.