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Multiple AI companies release new model variants and agent systems in March 2026

Model release Provisional 60% confidence first seen

Several major AI developments occurred in March 2026 across multiple companies. OpenAI released GPT-5.4 mini and nano models with expanded context windows, Mistral open-sourced its Small 4 model family, and companies including Meta, Nvidia, Google, and Cohere released new models and agent systems with various performance improvements.

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