# deepseek-v3.1-maas

Calls to the model deepseek-v3.1-maas on Vertex AI stopped working on October 21, 2026.

On October 21, 2026, the model deepseek-v3.1-maas reached retirement on Vertex AI. Requests targeting this model fail since that date. The deprecation was initially announced on July 21, 2026.

## The error Vertex AI returns once deepseek-v3.1-maas is gone

HTTP 404

```json
{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/deepseek-v3.1-maas` was not found or your project does not have access to it. Ensure you are using a valid model name and that the model is available in the specified region.","status":"NOT_FOUND"}}
```

## What to use instead

Self-deploy DeepSeek-V3.1 on Model Garden.

- API: Vertex AI (aiplatform.googleapis.com)
- Model: deepseek-v3.1-maas
- Released: August 28, 2025 (models.dev)
- Kind: Model retirement
- Announced: July 21, 2026
- Takes effect: October 21, 2026
- Calls after that day: fail
- Calls it hits: `model deepseek-v3.1-maas`
- Source: [Deprecations page](https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/deprecations/open-models)
- Verified: November 6, 2026, against Vertex AI's own pages
- Page: https://www.okapi.bot/models/vertex-ai/deepseek-v3.1-maas/

## Vertex AI's words

> Model ID: deepseek-v3.1-maas; Deprecation date: July 21, 2026; Retirement date: October 21, 2026; Self-deploy alternative: Self-deploy DeepSeek-V3.1 on Model Garden

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent