Google's Gemini 4 Argon reached broader availability on October 13, 2026, after a limited September 30 preview for vetted cybersecurity partners in the Fairwind Program. The frontier model targets long-horizon agentic tasks in coding, finance, legal, science, and defense, posting leading scores on DeepSWE v1.1 and the Vals Index while offering an industry-high 1M output token limit. It launched at competitive introductory pricing of $2/$10 per million tokens through November 30 before doubling, undercutting rivals like OpenAI's GPT-6 Astra. The rollout follows months of delays, skipped Gemini 3.5 Pro plans, and DeepMind leadership shifts, positioning Argon as Google's direct response to frontier competition from Anthropic and OpenAI. Traders are monitoring subscriber access tiers, enterprise API adoption, and any early successor signals such as internal "Carbon" testing.