fix: correct Vertex AI claude-sonnet-4-6 model ID

[roomote]

Related GitHub Issue

Closes: #11625

Description

This PR attempts to address Issue #11625. 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:

• packages/types/src/providers/vertex.ts: Renamed model key from claude-sonnet-4-6@20260114 to claude-sonnet-4-6 in the vertexModels object, and updated the reference in the VERTEX_1M_CONTEXT_MODEL_IDS array.
• src/api/providers/__tests__/anthropic-vertex.spec.ts: Updated the test referencing the old model ID.

Feedback and guidance are welcome.

Test Procedure

• Ran npx vitest run api/providers/__tests__/anthropic-vertex.spec.ts from the src/ directory: all 31 tests pass.
• All lint checks pass via turbo lint.
• All type checks pass via turbo check-types.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: No documentation updates are required.
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

• No documentation updates are required.

Additional Notes

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.

Start a new Roo Code Cloud session on this branch

[yuvarajl]

@hannesrudolph approval ?

[hannesrudolph]

LGTM. Merging per Hannes' request.