googleapis / googleapis/python-genai
service_tier field is missing from GenerateContentResponseMetadata model
Open
priority: p2
type: bug
- Dominant language
- Python
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Description
**Environment details**
- Programming language: Python
- OS: macOS 26.4.1
- Language runtime version: 3.12
- Package version: google-genai>=2.0.0 (actual version 2.2.0)
**Issue**
GenerateContent endpoint (https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash-image:generateContent) has an extra field `usageMetadata.serviceTier` which is not present in `GenerateContentResponseUsageMetadata` class.
Since `_common.BaseModel` has `extra='forbid'`, passing the resulting json to `GenerateContentResponse` results in error.
Note: the same applies for 3.1 flash image preview. Probably other endpoints as well.
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