> For the complete documentation index, see [llms.txt](https://docs.otari.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.otari.ai/guides/agents-and-frameworks/use-with-opencode.md).

# Use with opencode

[opencode](https://opencode.ai) lets you register any OpenAI-compatible backend as a provider. Otari exposes an OpenAI-compatible endpoint (`POST /api/v1/chat/completions`), so you can route opencode through Otari to get budgets, usage tracking, and traces without changing how you code.

## Quick start

Add Otari as a provider in your `opencode.jsonc`:

```jsonc
{
  "provider": {
    "otari": {
      "npm": "@ai-sdk/openai-compatible",
      "options": {
        "baseURL": "http://localhost:8000/api/v1",
        "apiKey": "{env:OTARI_API_KEY}"
      }
    }
  }
}
```

`baseURL` is the Otari API root, `/api/v1` (opencode appends `/chat/completions` itself). Point it at the gateway you are actually using: `http://localhost:8000/api/v1` for local development, your self-hosted gateway URL plus `/api/v1`, or `https://api.otari.ai/api/v1` when using otari.ai. Accounts in otari.ai's EU region use `https://eu.api.otari.ai/api/v1` instead: `api.otari.ai` answers an EU key with `421 Misdirected Request`, naming the host to use.

Export your key so opencode reads it from the environment instead of the config file, then run with a model:

```bash
export OTARI_API_KEY=<your-otari-key>      # from otari.ai, or from your own gateway
opencode --model otari/openai:gpt-4o
```

The `apiKey` is sent as `Authorization: Bearer <key>`, which Otari accepts for every key it issues.

## Choosing a model

opencode names a model as `<provider id>/<model>`, and the provider id here is `otari`, from your config. Everything after `otari/` is sent to Otari unchanged, so write it as Otari spells it. On otari.ai, `otari/openai/gpt-4o` or `otari/anthropic/claude-sonnet-4-6` lets Otari choose the provider, and a `provider:model` selector such as `otari/anthropic:claude-sonnet-4-6` pins one. On your own gateway, use `provider:model` for any provider it is configured with, such as `otari/openai:gpt-4o`. [Model format](https://docs.otari.ai/reference/gateway/models#model-format) has the spellings Otari accepts, and [Listing available models](https://docs.otari.ai/reference/gateway/models#listing-available-models) shows which models your key can use.

## See also

* [Use with Claude Code](/guides/agents-and-frameworks/use-with-claude-code.md): drive the Claude Code CLI through the same Otari via the Anthropic Messages API.
* [Use with Codex](/guides/agents-and-frameworks/use-with-codex.md): drive the Codex CLI through the same Otari via the OpenAI Responses API.


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