AI model release

Google has released Gemini 4 Argon, a new model the company calls its most powerful yet, with a specific focus on defensive cybersecurity work. The model is currently limited to select partners through Google's Fairwind Program, with no public pricing or context window details disclosed.

Anthropic has released Claude Sonnet 5.5, the second model in its Claude 5.5 family following last week's Opus 5.5. The model runs more than 30% faster and costs up to 30% less for most work while keeping Sonnet 5's per-token pricing.

Anthropic has released Claude Opus 5.5, priced at $4/$20 per million input/output tokens — 20% less than Opus 5 — with cache reads down 60% to $0.20 per million tokens. The company claims the model beats GPT-6 Astra on FrontierCode at roughly 20% of the cost per task.

Google DeepMind and Google Research released WeatherNext 3, a weather AI model trained on real-time geostationary satellite data instead of lagging numerical weather prediction outputs. Google claims up to 50% more accurate day-ahead precipitation forecasts, now rolling out to Search, Maps, and the Gemini app.

Meta has released Muse Spark, the first model from Meta Superintelligence Labs, a unit assembled under chief AI officer Alexandr Wang following Meta's $14.3 billion investment in Scale AI. The natively multimodal model features a "Contemplating" reasoning mode with parallel sub-agents and marks Meta's break from its open-source Llama heritage by operating as closed source.