Google opens Gemini 4 Argon to paid API, Ultra, and Pro users

Google DeepMind said on 13 October 2026 that Gemini 4 Argon is now available worldwide for developers and enterprises through the Gemini API in AI Studio and the Gemini platform, for Google AI Ultra subscribers in Antigravity, and for Ultra and Pro subscribers in the Gemini app and AI Mode in Search. Google prices Argon at an introductory $2 per million input tokens and $10 per million output tokens (cached input 95% off), rising to $4 / $20 after 30 November 2026. The model has a 1M unified input-output token limit via the API. Google claims Argon ranks first on the Vals Index across finance, coding, legal and tax work, and shows internal wins such as more than 35% more agentic code submissions with nearly a third fewer rollbacks in Antigravity, plus speed-ups on ADK session prep, xTB chemistry, and Gemma inference. Safety notes include a misalignment monitor and 0.7% attack success on Gray Swan indirect prompt injection. Figures are Google's own. On Hacker News (about 943 points, ~730 comments), many praise Argon's clear writing and depth for non-coding work, while a large camp is angry at the rollout: "Try Gemini 4" buttons that still open older models, Pro vs Ultra confusion, and slow access. Coding comparisons split between people who find it competitive and people who still prefer Claude Opus 5.5. No consensus. Sorted take: treat this as a real frontier option for paid Google accounts, but verify you actually have Argon in the model picker before you change workflows.