---
title: "Opencode"
description: "Use Opencode with Bifrost to access any AI provider through a terminal-based coding assistant with virtual keys and observability."
icon: "codepen"
---

[Opencode](https://github.com/sst/opencode) is an AI-powered coding application that supports OpenAI-compatible APIs. By pointing it at Bifrost, you get access to any provider/model in your Bifrost configuration, plus governance features like virtual keys, built-in observability, and per-model options for reasoning effort, thinking budget, and more.

![Opencode with Bifrost](../media/opencode-with-bifrost.png)

<Note>
If your Allowed Headers are already set to `*`, you can skip this note. If not and you face issues integrating Bifrost with OpenCode, try switching to `*` or adding the specific headers required by your client. By default, Bifrost whitelists: `Content-Type`, `Authorization`, `X-Requested-With`, `X-Stainless-Timeout`, and `X-Api-Key`.
</Note>

## Setup

### 1. Configure OpenCode to work with Bifrost

OpenCode uses a JSON config file (`opencode.json`) to configure providers. Point your provider's `baseURL` to Bifrost.

### Using OpenAI-compatible endpoint

Route OpenAI and other providers through Bifrost's OpenAI endpoint:

```jsonc
{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "openai": {
      "name": "Bifrost",
      "options": {
        "baseURL": "http://localhost:8080/openai",
        "apiKey": "your-bifrost-key"
      },
      "models": {
        "openai/gpt-5": {},
        "anthropic/claude-sonnet-4-5-20250929": {},
        "gemini/gemini-2.5-pro": {}
      }
    }
  },
  "model": "openai/gpt-5"
}
```

### Using Anthropic endpoint

Route Anthropic models through Bifrost's Anthropic endpoint:

```jsonc
{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "anthropic": {
      "name": "Bifrost",
      "options": {
        "baseURL": "http://localhost:8080/anthropic/v1",
        "apiKey": "your-bifrost-key"
      },
      "models": {
        "anthropic/claude-sonnet-4-5-20250929": {}
      }
    }
  },
  "model": "anthropic/claude-sonnet-4-5-20250929"
}
```

<Tip>
You can also use the `/connect` command in the OpenCode TUI to configure credentials interactively, then update the `baseURL` in your config file.
</Tip>

## Virtual Keys

When Bifrost has [virtual key authentication](/features/governance/virtual-keys) enabled, set `apiKey` in your provider options to your virtual key:

```jsonc
"options": {
  "baseURL": "http://localhost:8080/openai",
  "apiKey": "bf-your-virtual-key-here"
}
```

This lets you enforce usage limits, budgets, and access control per user or environment. For team deployments, create a separate virtual key for each team — each key can have its own rate limits, budgets, and provider access rules configured in the Bifrost dashboard.

## Model Selection

Set your default models in `opencode.json`:

```jsonc
{
  "model": "openai/gpt-5",
  "small_model": "anthropic/claude-haiku-4-5"
}
```

Switch models in the TUI with <key>ctrl</key>+<key>p</key>

![Opencode model selection](../media/opencode-model-selection.png)

- Use powerful models like `openai/gpt-5` or `anthropic/claude-sonnet-4-5-20250929` for complex coding tasks
- Use fast models like `groq/llama-3.3-70b-versatile` for quick completions
- Set `small_model` to a lighter model for faster, lower-cost operations

## Using Multiple Providers

Bifrost routes requests to the correct provider based on the model name. Use the `provider/model-name` format to access any configured provider through the single OpenAI endpoint:

```
anthropic/claude-sonnet-4-5-20250929
openai/gpt-5
gemini/gemini-2.5-pro
mistral/mistral-large-latest
```

You can configure models from different providers with per-model options:

```jsonc
{
  "$schema": "https://opencode.ai/config.json",
  "theme": "opencode",
  "autoupdate": true,
  "provider": {
    "openai": {
      "name": "Bifrost",
      "options": {
        "baseURL": "http://localhost:8080/openai",
        "apiKey": "your-bifrost-key"
      },
      "models": {
        "openai/gpt-5": {
          "options": {
            "reasoningEffort": "high",
            "textVerbosity": "low",
            "reasoningSummary": "auto",
            "include": [
              "reasoning.encrypted_content"
            ]
          }
        },
        "anthropic/claude-sonnet-4-5-20250929": {
          "options": {
            "thinking": {
              "type": "enabled",
              "budgetTokens": 16000
            }
          }
        }
      }
    }
  }
}
```

### Supported Providers

Bifrost supports the following providers with the `provider/model-name` format:

`openai`, `azure`, `gemini`, `vertex`, `bedrock`, `mistral`, `groq`, `cerebras`, `cohere`, `perplexity`, `xai`, `ollama`, `openrouter`, `huggingface`, `nebius`, `parasail`, `replicate`, `vllm`, `sgl`

<Warning>
Non-native models **must support tool use** for OpenCode to work properly. OpenCode relies on tool calling for file operations, terminal commands, and code editing. Models without tool use support will fail on most operations.
</Warning>

<Note>
OpenCode connects to Bifrost via a single endpoint. Bifrost handles routing to the correct provider based on the model name — no per-provider configuration needed.
</Note>

## Observability

All OpenCode traffic through Bifrost is logged. Monitor it at `http://localhost:8080/logs` — filter by provider, model, or search through conversation content to track usage.

## Next Steps

- [Provider Configuration](/quickstart/gateway/provider-configuration) — Configure AI providers in Bifrost
- [Virtual Keys](/features/governance/virtual-keys) — Set up usage limits and access control