Google Vertex AI models shut down on October 20, 2026

Google Vertex AI shut down 3 models on October 20, 2026: gemini-2.5-flash, gemini-2.5-flash-lite, and gemini-2.5-pro. Official replacements named by the provider: gemini-3.5-flash, gemini-3.5-flash-lite, and gemini-3.8-flash. Requests to these models started failing on that date.

Verified on Google's model versions page on October 19, 2026: https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/model-versions. That page lists retirement on October 20, 2026 for gemini-2.5-pro, gemini-2.5-flash, and gemini-2.5-flash-lite.

This date has passed. The rows below stay up because people still search after requests fail. Google Vertex AI deprecation page · Google Vertex AI on SunsetDiff · Shutdowns in 2026-10

Migration checklist

1. Find every request that still uses these model ids. They shut down on October 20, 2026.
2. Point each request at the replacement in the table. If a cell says "Not published", the provider did not name one.
3. Open the source link on each row and read that page before you switch.
4. Run the scan page on your code to catch the ids in this table.

Scan your code for these model ids. Each migrate link opens the diff for that model.

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