OhMyGPT

OpenCode is an open-source AI coding agent available as a terminal interface, desktop app, or IDE extension. This guide connects it to OhMyGPT using the OpenAI-compatible provider.

Installation

curl -fsSL https://opencode.ai/install | bash

Configuration

OpenCode uses a global JSON config file. Create or edit the file at:

Platform	Path
Linux / macOS	`~/.config/opencode/opencode.json`
Windows	`%APPDATA%\opencode\opencode.json`

OpenCode relies on the Vercel AI SDK for provider compatibility. Use the @ai-sdk/openai-compatible package to connect to OhMyGPT.

Claude Models via OhMyGPT

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "ohmygpt": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "OhMyGPT",
      "options": {
        "apiKey": "<your-ohmygpt-api-key>",
        "baseURL": "https://apic1.ohmycdn.com/api/v1/ai/openai/cc-omg/v1"
      },
      "models": {
        "claude-sonnet-4-5": {
          "name": "Claude Sonnet 4.5",
          "limit": {
            "context": 200000,
            "output": 64000
          }
        },
        "claude-haiku-4-5": {
          "name": "Claude Haiku 4.5",
          "limit": {
            "context": 200000,
            "output": 64000
          }
        }
      }
    }
  }
}

OpenAI Models via OhMyGPT

GPT-5.2 Codex currently has parameter compatibility issues with OpenCode. See anomalyco/opencode#5421 for status.

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "ohmygpt-openai": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "OhMyGPT (OpenAI)",
      "options": {
        "apiKey": "<your-ohmygpt-api-key>",
        "baseURL": "https://apic1.ohmycdn.com/v1"
      },
      "models": {
        "gpt-5.2-codex": {
          "name": "GPT-5.2 Codex",
          "limit": {
            "context": 400000,
            "output": 128000
          }
        }
      }
    }
  }
}

Combined Configuration

You can define multiple providers in a single config to switch between models:

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "ohmygpt-claude": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "OhMyGPT Claude",
      "options": {
        "apiKey": "<your-ohmygpt-api-key>",
        "baseURL": "https://apic1.ohmycdn.com/api/v1/ai/openai/cc-omg/v1"
      },
      "models": {
        "claude-sonnet-4-5": {
          "name": "Claude Sonnet 4.5",
          "limit": {
            "context": 200000,
            "output": 64000
          }
        },
        "claude-haiku-4-5": {
          "name": "Claude Haiku 4.5",
          "limit": {
            "context": 200000,
            "output": 64000
          }
        }
      }
    },
    "ohmygpt-openai": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "OhMyGPT OpenAI",
      "options": {
        "apiKey": "<your-ohmygpt-api-key>",
        "baseURL": "https://apic1.ohmycdn.com/v1"
      },
      "models": {
        "gpt-5.2-codex": {
          "name": "GPT-5.2 Codex",
          "limit": {
            "context": 400000,
            "output": 128000
          }
        }
      }
    }
  }
}

Configuration Reference

Field	Description
`npm`	AI SDK package to use. Use `@ai-sdk/openai-compatible` for OhMyGPT
`name`	Display name shown in OpenCode UI
`options.apiKey`	Your OhMyGPT API key (can also use `{env:VAR_NAME}` syntax)
`options.baseURL`	OhMyGPT endpoint URL
`models.<id>.name`	Display name for the model
`models.<id>.limit.context`	Maximum context window (tokens)
`models.<id>.limit.output`	Maximum output length (tokens)

Using Environment Variables

Instead of hardcoding your API key, reference an environment variable:

{
  "options": {
    "apiKey": "{env:OHMYGPT_API_KEY}",
    "baseURL": "https://apic1.ohmycdn.com/api/v1/ai/openai/cc-omg/v1"
  }
}

Then set the environment variable in your shell profile:

export OHMYGPT_API_KEY="<your-ohmygpt-api-key>"

Verification

Start OpenCode in your project directory:

cd /path/to/project
opencode

Run /init to initialize OpenCode for the project, then use /model to select your configured OhMyGPT model.

Troubleshooting

Symptom	Cause	Solution
Provider not listed	Config file not found	Verify config path matches your platform
"Invalid API key"	Key not set or incorrect	Check `apiKey` value or environment variable
Model parameter errors	SDK compatibility issue	Check OpenCode issues for model-specific bugs
JSON parse error	Syntax error in config	Validate JSON format (no trailing commas, proper quoting)

OpenCode

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