[BUG] Vertex Sonnet 4.6 Model id is not right

[yuvarajl]

Problem (one or two sentences)

Date/time: 2026-02-20T08:50:31.114Z Extension version: 3.50.0 Provider: vertex Model: claude-sonnet-4-6@20260114 404 404 [{"error":{"code":404,"message":"Publisher Model projects/xxxxx-234/locations/us-east5/publishers/anthropic/models/claude-sonnet-4-6@20260114 was not found or your project does not have access to it. Please ensure you are using a valid model version. For more information, see: https://cloud.google.com/vertex-ai/generative-ai/docs/learn/model-versions","status":"NOT_FOUND"}}]

Facing this error

Vertex for sonnet 4.6 the model id is claude-sonnet-4-6

Context (who is affected and when)

Happens to users who uses google vertex AI with claude-sonnet-4-6@20260114

Reproduction steps

Select vertex as provider
and select claude-sonnet-4-6@20260114 as model

and you will get the error

Expected result

model name in modele selection drop down should be claude-sonnet-4-6

Actual result

404 not found from vertex for the current model claude-sonnet-4-6@20260114

Variations tried (optional)

No response

App Version

3.50.0

API Provider (optional)

Google Vertex AI

Model Used (optional)

claude-sonnet-4-6@20260114

Roo Code Task Links (optional)

No response

Relevant logs or errors (optional)

[roomote]

I've analyzed this issue and here's my proposed implementation plan:

The Vertex AI model ID claude-sonnet-4-6@20260114 includes a date version suffix (@20260114) that causes a 404 error on Google Vertex AI. The correct model ID should be claude-sonnet-4-6 (without the date suffix), consistent with how claude-opus-4-6 is already defined in the same file.

Changes required:

1. packages/types/src/providers/vertex.ts - Rename the model key from "claude-sonnet-4-6@20260114" to "claude-sonnet-4-6" in the vertexModels object (line 295), and update the reference in the VERTEX_1M_CONTEXT_MODEL_IDS array (line 544).

2. src/api/providers/__tests__/anthropic-vertex.spec.ts - Update the test that references "claude-sonnet-4-6@20260114" (line 904) to use "claude-sonnet-4-6".

This is a straightforward model ID correction. The claude-opus-4-6 entry in the same file already follows the correct pattern (no date suffix), so this change aligns claude-sonnet-4-6 with that convention.

Please mention @roomote in a comment saying that you approve this plan, and I'll proceed with the implementation.

[yuvarajl]

@roomote go ahead and raise an PR for the fix

[roomote]

I've seen your comment and will implement the fix now. I'll open a PR to share progress shortly.

[roomote]

Opened a draft PR with my attempt at addressing this: #11626. Feedback welcome!