Poolside raised $1B at a $12B valuation. Eric Zelikman raised $1B after leaving Xai. Weavy joined Figma. New research highlights FP16 precision reduces training-inference mismatch in reinforcement-learning fine-tuning compared to BF16. Kimi AI introduced a hybrid KDA (Kimi Delta Attention) architecture improving long-context throughput and RL stability, alongside a new Kimi CLI for coding with agent protocol support. OpenAI previewed Agent Mode in ChatGPT enabling autonomous research and planning during browsing.