Signal: Gemini 4 Argon, Muse Spark Open, and agents in production

This period was dominated by frontier model releases and by agents moving into production work, from security operations to legal review and long-running research. Google's Gemini 4 Argon and Meta's open-weight Muse Spark Open both landed, and the more telling signal is how quickly vendors are showing measurable results inside enterprises rather than benchmarks alone. For founders, the bar is shifting toward reliability, auditability and distribution on the devices people already use.