Google / breaking change
Gemini Interactions API replaced outputs with a typed steps timeline
Google replaced the Interactions API outputs array with typed steps and consolidated output controls under a polymorphic response_format. Its current migration timeline marks the legacy schema removed on June 8, 2026, after the new schema became the default on May 26.
- Affected product / version
- Gemini v1beta Interactions API, May–June 2026 schema
- Announced
- Effective
- Source checked
Checked against the linked documentation on 2026-09-07. Recheck the vendor documentation before acting.
What to check in your application
PlaintextML interpretation of the documented change:
- Update response parsing, stored interaction fixtures, function-call extraction, and streaming event handlers to consume typed steps rather than assuming a flat model-output array.
- Upgrade Gemini SDK clients to version 2 or later and migrate response_mime_type plus modality-specific configuration into response_format before enabling newer Interactions features.
Limits and uncertainty
This covers v1beta Interactions, not GenerateContent. The current timeline marks removal, but surrounding prose still uses future tense and the changelog has no separate post-event June 8 confirmation. We have not probed the retired endpoint.
Official sources
Revision history
- — Initial record added after checking the linked official documentation; migration checks are editorial interpretation.
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