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OpenCode

OpenCode.ai is an open-source, model-agnostic AI coding agent designed to bring powerful AI assistance directly into developers’ workflows—whether you are working in the terminal, using a desktop application, or inside an IDE extension. Key features include:
  • Terminal-first, multi-interface design
    A native terminal UI (TUI), with optional desktop and IDE extensions, allows developers to work in their preferred environment.
  • Context-aware intelligence
    Language Server Protocol (LSP) integration enables deep understanding of project structure and symbols.
  • Multi-session collaboration
    Run parallel agent sessions within the same repository and share them for collaborative debugging or review.
  • Privacy-first by design
    Code and project context are not stored on remote servers, making OpenCode suitable for sensitive or proprietary codebases.

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Configure OpenCode.ai to Use Vivgrid (GPT-5.1-Codex)

One of OpenCode’s core strengths is its clean separation between authentication and runtime model configuration. Credentials are configured independently from model selection, allowing you to switch providers or models without changing your workflow. To use Vivgrid as the provider and gpt-5.1-codex or gpt-5.1-codex-max as the model, you only need to configure as:
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Step 1: Open OpenCode

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Step 2: `/models`

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Step 3: Precess `ctrl-a` to see all providers

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Step 4: Search `vivgrid`

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Step 5: Enter your vivgrid api-key which can be grab from [Vivgrid Console](https://console.vivgrid.com)

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Step 6: Select models you want to use

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Step 8: Enjoy

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Debugging

If you encounter issues, enable detailed logs: 
opencode run "hello" --print-logs --log-level DEBUG
This will surface provider initialization, model resolution, and API-level errors.

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5. GUI

This configuration also works for OpenCode GUI App.

OpenCode with Vivgrid Provider

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Summary

With only two small configuration files, OpenCode becomes a provider-agnostic AI coding agent, while Vivgrid serves as a drop-in, OpenAI-compatible backend for GPT-5.1-Codex. This clear separation between credential management and runtime configuration is what makes OpenCode especially well-suited for advanced models, custom providers, and production-grade AI coding workflows.