Gemini API: automatic routing changes and the Deep Research deadline
The changelog announces several migrations that can change the behavior of an application without changing its code.
Deprecation announced
Facts, analysis and limits
Verified facts
- Requests to gemini-3.7-flash are automatically routed to gemini-3.8-flash.
- Requests to gemini-3.5-flash are automatically routed to gemini-3.6-flash.
- deep-research-pro-preview-12-2025 is deprecated and must be stopped on 23 October; the April versions are proposed for migration.
What changes
Operational priority for existing integrations.
Practical implication
Inventory IDs, launch regression tests and migrate Deep Research before October 23.
Availability
Gemini API / AI Studio: Belgium is one of the supported regions. Effective access, billing and model-specific restrictions remain to be checked. This list does not establish a European processing residence and does not apply to all functions of the Gemini application.
Limits and uncertainty
No independent product testing or account-access check was performed for this entry.