Model Release

StepFun releases open weights for Step 5 Preview, a 600B model with 27B active parameters: StepFun released open weights for its Step 5 Preview model, with 600B total and 27B active parameters and a 1M context window. It published a technical blog describing the model's 92-layer design, sparse grouped-query attention, and long-horizon agent training.

StepFun • Pandaily

Google releases Gemini 4 Argon worldwide, saying Argon cut coding tasks from months to weeks: Google released Gemini 4 Argon worldwide via its API, Gemini app, and Google Antigravity. It is aggressively priced but trails Anthropic's Claude Opus 5.5 and Meta's Muse Wonder Full in independent benchmarks. Google says Argon internally cut coding tasks from months to weeks.

AI Models • The Decoder

GPT-6

OpenAI releases guide for navigating the GPT-6 model family