Zed OpenCode ACP thinking variants cannot be accessible

[validatedev]

Description

I connected my ChatGPT subscription to OpenCode and tried using the official Zed ACP plugin. I can switch thinking variants from the OpenCode CLI, but not from ACP. I’m not sure whether this is a bug or just an unimplemented feature.

Plugins

None

OpenCode version

1.1.23

Steps to reproduce

1. Authenticate ChatGPT via OpenCode.
2. Confirm that authentication succeeded.
3. In Zed, install the OpenCode Agent Server Extension (ACP).
4. Start a new Zed thread using OpenCode.
5. Choose one of the GPT models via the OpenAI provider.
6. Notice there is no option to change the thinking level.

Screenshot and/or share link

Operating System

macOS Sequoia 15.7.3

Terminal

Ghostty

[github-actions]

This issue appears to be related to broader ACP/Zed integration limitations:

• Feature: Expose TUI Session Management Commands via ACP (for Zed integration) #8931: Feature request to expose TUI session management commands via ACP - includes variants/thinking level switching as part of a larger feature parity gap between TUI and ACP
• ACP loadSessionMode doesn't restore persisted model/agent from session messages #7804: ACP loadSessionMode doesn't restore persisted model/agent from session messages - related to model/variant state management in ACP
• JetBrains ACP hangs indefinitely on windows #7632: The JetBrains ACP invocation gets stuck in the "thinking" state indefinitely - another thinking-related ACP issue

Feel free to ignore if these don't address your specific case, but they may provide additional context on ACP limitations with model variant/thinking level support.