Google's Gemini 4 Argon, announced September 30 and broadly released October 13, 2026, reached Pro/Ultra subscribers, the Gemini API, AI Studio, and Antigravity platform after an initial limited rollout to Fairwind cybersecurity testers. The model targets long-horizon agentic tasks in coding, finance, legal, science, and defense, posting top marks on DeepSWE v1.1 and the Vals Index while offering a 1M output token limit and aggressive introductory pricing of $2/$10 per million tokens through November 30. Traders view the rapid follow-up to months of delays and skipped Gemini 3.5 plans as evidence of renewed DeepMind momentum, though internal testing of a successor codenamed Carbon suggests Google may iterate again before year-end. Competitive pressure from GPT-6 Astra and Claude Opus 5.5, plus historical release cadence, shapes expectations for the timing of any next Argon variant.