claude-3-5-haiku shut down Jul 5, 2026 (Vertex AI)

The error you get

What Vertex AI answers a call to claude-3-5-haiku once the model is gone, as recorded from real responses:

HTTP 404

{"error":{"code":404,"message":"Publisher model `projects/{project}/locations/{region}/publishers/google/models/claude-3-5-haiku` 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"}}

Facts

API: Vertex AI aiplatform.googleapis.com
Model: claude-3-5-haiku
Released: October 22, 2024 (models.dev)
Kind: Model retirement
Takes effect: July 5, 2026
Calls after that day: Fail
Source: Deprecations page
Last updated: October 19, 2026
Verified: November 6, 2026, against Vertex AI's own pages

Questions

When does claude-3-5-haiku shut down?

Calls to the model claude-3-5-haiku on Vertex AI stopped working on July 5, 2026.

What happens to calls after July 5, 2026?

They have failed since July 5, 2026.

What error does claude-3-5-haiku return once it is shut down?

Vertex AI answers HTTP 404: "Publisher model `projects/{project}/locations/{region}/publishers/google/models/claude-3-5-haiku` 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.". Send another model to fix it.

When was claude-3-5-haiku released?

claude-3-5-haiku was released on October 22, 2024, according to models.dev.

How do I find the calls this hits in my code?

Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.

claude-3-5-haiku on other APIs 2

Feb 19, 2026 Anthropic claude-3-5-haikuModel retirement Stopped working
No date OpenCode claude-3-5-haikuModel retirement Deprecated, no date

More from Vertex AI 10

Jun 30, 2026 imagen-3.0-capability-002Model retirement Stopped working
Jun 30, 2026 imagen-3.0-generate-001Model retirement Stopped working
Jun 30, 2026 imagen-3.0-generate-002Model retirement Stopped working
Jun 30, 2026 imagen-4.0-fast-generate-001Model retirement Stopped working
Jun 30, 2026 imagen-4.0-generate-001Model retirement Stopped working
Jun 30, 2026 imagen-4.0-ultra-generate-001Model retirement Stopped working
Jul 5, 2026 models claude-3-5-haiku@*Model retirement Stopped working
Jul 9, 2026 gemini-2.5-flash-lite-preview-09-2025Model retirement Stopped working
Jul 9, 2026 gemini-2.5-flash-preview-05-2025Model retirement Stopped working
Jul 9, 2026 gemini-3.1-flash-lite-previewModel retirement Stopped working

You fixed this one by hand.

Okapi opens the pull request with the fix before the next breaking change reaches your code.

Add to GitHub

Vertex AI claude-3-5-haiku model retirement