Top story
TOP STORY: Frontier Model Surge. Multiple major labs have released or previewed significant model updates simultaneously, marking an unusually competitive 24-hour window in frontier AI development. Frontier Model News
Industry
Claude Sonnet 4.6, Anthropic - Anthropic releases an updated Sonnet mid-tier model continuing its rapid 2026 iteration cadence. Source
Gemini 3.1 Pro Preview, Google - Google opens preview access to Gemini 3.1 Pro, signaling an incremental capability push in its flagship line. Source
Qwen 3.5, Alibaba - Alibaba drops Qwen 3.5, continuing its aggressive open-weight model release schedule into early 2026. Source
Items also tracked from Feb 21, see yesterday's model log for context.