Google shipped Gemini 4 Argon to developers and businesses worldwide on October 13, 2026, positioning it as the frontier reasoning model in its lineup, with reports putting the introductory price at $2 per million input tokens. Google paired Argon with a second model, a world model and a set of product upgrades, making the launch a lineup refresh rather than a single model drop. OpenAI and Google Cloud also announced that OpenAI’s frontier models and Codex workflows will appear in Gemini’s Model Garden through Google Cloud Marketplace, putting a direct rival’s models on Google’s own shelf. The article states that Google, OpenAI, ChatGPT and Gemini all moved in the same few weeks, with product names changing fast, and that the facts come from Google and OpenAI announcements as relayed by outlets that track them. It also says a separate Argon versus Claude Opus 5.5 coding comparison listed 77.9% versus 74.2% on DeepSWE, and that any single benchmark should be treated as one input.