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