`gemini-1.*` and `gemini-2.0*` models are respectively deprecated and scheduled for shutdown on June 1, 2026. `gemini-2.5*` models are their successors.
No regressions in unit tests:
```
========================================================================================== 5583 passed, 2237 warnings in 84.91s (0:01:24) ===========================================================================================
```
PiperOrigin-RevId: 907663315
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