GitLab Duo /models selection still responds as Claude 3.5 Sonnet

[harkaranbrar7]

Description

When using GitLab Duo (OAuth login) and selecting a Duo model via /models (e.g., gitlab/duo-chat-opus-4-5), the chat responses still identify as Claude 3.5 Sonnet. It looks like the GitLab provider doesn’t map the selected duo-chat-* model to the underlying Anthropic model, and also doesn’t pass through provider.gitlab.options.

Plugins

No response

OpenCode version

1.1.19

Steps to reproduce

1. Authenticate with GitLab via OAuth in OpenCode
2. Open TUI and run /models
3. Select gitlab/duo-chat-opus-4-5 (or duo-chat-sonnet-4-5)
4. Send a prompt
5. The assistant responds identifying as Claude 3.5 Sonnet instead of the selected Duo 4.5 model

Expected behavior The response should match the selected Duo model (e.g., Claude Opus 4.5 or Sonnet 4.5).

Possible root cause packages/opencode/src/provider/provider.ts GitLab loader calls:

sdk.agenticChat(modelID, { anthropicModel, featureFlags })

But:

• provider.gitlab.options is not merged into options (only featureFlags are)
• there is no mapping from duo-chat-opus-4-5 → claude-opus-4-5 (and similar)

So anthropicModel stays undefined and the GitLab SDK likely defaults to Claude 3.5 Sonnet.

Screenshot and/or share link

No response

Operating System

Ubuntu 24.04

Terminal

Windows Terminal