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DeepSeek releases V4-Pro and V4-Flash, Mixture-of-Experts models supporting million-token context with hybrid attention and Muon optimizer.
OpenAI releases o3 and o4-mini, its latest reasoning models that can agentically access and combine all ChatGPT tools (web search, code execution, image analysis, image generation). o3 achieves state-of-the-art performance on coding, math, and science benchmarks with 20% fewer major errors than o1, while o4-mini offers efficient reasoning optimized for cost and speed.