1.3 KiB
Vertex AI Batch Eligibility Probe — gemini-3.1-pro-preview
Date: 2026-04-24 · Target: PM-RATIFY-VERTEX-BATCH-ELIGIBILITY gate · Budget actual: <$0.02 (control job only).
Verdict: INFEASIBLE
publishers/google/models/gemini-3.1-pro-preview exists in the Vertex
publisher catalog (REST GET /v1/publishers/google/models/gemini-3.1-pro- preview with X-Goog-User-Project: gen-lang-client-0674908699 → HTTP
200) but is NOT registered for Batch Prediction. SDK
vertexai.batch_prediction.BatchPredictionJob.submit(source_model=…)
returns NotFound: 404 The PublisherModel gemini-3.1-pro-preview does not exist. on both bare name and fully-qualified forms.
Control proof (plumbing OK)
Identical SDK path with source_model="gemini-2.5-flash" submitted
successfully: projects/565729498549/locations/us-central1/ batchPredictionJobs/7779966002640453632 (state=PENDING). Vertex Batch
maintains a batch-eligibility registry distinct from the publisher
catalog; Gemini 3.1 Pro Preview is absent from the former.
SDK versions (audit)
google-cloud-aiplatform 1.148.1, google-cloud-storage 3.10.1,
Python 3.11.9.
Consequence
Branch A (§1.3e fallback) closed. Stage 3 re-kick remains gated on Google quota ticket. Re-probe when Google adds 3.1 Pro Preview to batch registry; monitor Vertex release notes.