> ## Documentation Index
> Fetch the complete documentation index at: https://opencode.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Models

OpenCode builds its model catalog from [Models.dev](https://models.dev), provider integrations, and your configuration.
Only enabled models whose provider is available for the current project appear in the model picker.

Connect a provider with `/connect` in the TUI, or configure it in [Providers](/providers).

## Choose a model

Open the model picker with `/models` or the default `<leader>m` keybind. The picker shows the models available from
providers connected to the current project.

Select a model to use it in the current session. Switching models updates that session without changing your config. Use
the catalog entries shown in the picker rather than guessing a provider or model name.

## Per-run model

Select a model for one non-interactive run with `--model` or `-m`:

```bash theme={null}
opencode2 run --model openai/gpt-5.2 "Explain this repository"
opencode2 run -m openai/gpt-5.2#high "Review the current changes"
```

Agents and commands can also select their own model. See [Agents](/agents) and [Commands](/commands).

## Variants

Variants are named request overlays for one model, commonly used for reasoning effort or token budgets. Available names
are model-specific and are derived from current catalog metadata. Do not assume that names such as `low`, `high`, or
`max` exist for every model; `/variants` shows the valid choices.

Use `/variants` to choose one for the current model, or press `ctrl+t` to cycle through available variants.

## Configure

### Default model

Set `model` in `opencode.json` or `opencode.jsonc`:

```jsonc title="opencode.jsonc" theme={null}
{
  "$schema": "https://opencode.ai/config.json",
  "model": "anthropic/claude-sonnet-4-5"
}
```

The configured model becomes the catalog default when its provider is available and the model is enabled. Otherwise,
session execution falls back to the newest available supported model. An explicit model already selected on a session
takes precedence over the default; switching models changes that session and does not rewrite your config.

See [Config](/config) for configuration locations and precedence.

### Model settings

Provider and model entries can supply three kinds of request configuration:

* `settings` contains provider-package options such as `baseURL`, `reasoningEffort`, or `thinkingConfig`.
* `headers` adds HTTP request headers.
* `body` adds provider-specific fields to the request body.

These values are provider-specific JSON. OpenCode applies provider values first, then model values, then the selected
variant. Nested `settings` and `body` objects are merged; later array and scalar values replace earlier values. Header
names are matched case-insensitively.

You can also map a friendly catalog ID to a different API model ID with `modelID`:

```jsonc title="opencode.jsonc" theme={null}
{
  "$schema": "https://opencode.ai/config.json",
  "model": "openai/coding-default",
  "providers": {
    "openai": {
      "models": {
        "coding-default": {
          "modelID": "gpt-5.2",
          "name": "Coding default",
          "capabilities": {
            "tools": true,
            "input": ["text", "image"],
            "output": ["text"]
          },
          "limit": {
            "context": 200000,
            "output": 32000
          }
        }
      }
    }
  }
}
```

Here `openai/coding-default` is the selectable catalog reference, while `gpt-5.2` is sent to the provider. When adding a
model that is not already in the catalog, set accurate `capabilities` and `limit` values so OpenCode can expose tools and
enforce the correct context limits. Set `disabled: true` on a model entry to hide it from the available catalog.

### Custom variants

Add a variant, or override a catalog variant with the same ID, under the model's `variants` array:

```jsonc title="opencode.jsonc" theme={null}
{
  "$schema": "https://opencode.ai/config.json",
  "providers": {
    "openai": {
      "models": {
        "gpt-5.2": {
          "settings": {
            "reasoningEffort": "medium"
          },
          "variants": [
            {
              "id": "fast",
              "settings": {
                "reasoningEffort": "low"
              }
            },
            {
              "id": "deep",
              "settings": {
                "reasoningEffort": "high",
                "reasoningSummary": "auto"
              }
            }
          ]
        }
      }
    }
  }
}
```

Variant entries support `settings`, `headers`, and `body`. Selecting one deeply overlays its values on the effective
provider and model configuration. An unknown variant fails model resolution instead of silently using the base model.

### Local models

For an OpenAI-compatible server, define a provider package, endpoint, and at least one model:

```jsonc title="opencode.jsonc" theme={null}
{
  "$schema": "https://opencode.ai/config.json",
  "model": "local/coder",
  "providers": {
    "local": {
      "name": "Local server",
      "package": "aisdk:@ai-sdk/openai-compatible",
      "settings": {
        "baseURL": "http://127.0.0.1:1234/v1"
      },
      "models": {
        "coder": {
          "modelID": "model-name-on-server",
          "capabilities": {
            "tools": true,
            "input": ["text"],
            "output": ["text"]
          },
          "limit": {
            "context": 32768,
            "output": 8192
          }
        }
      }
    }
  }
}
```

Use the server's real model name, limits, modalities, and tool support. OpenCode cannot infer these for a model you add
manually. If the endpoint requires a key, add `apiKey` to provider `settings` using an environment substitution such as
`"apiKey": "{env:LOCAL_API_KEY}"`; do not commit secrets.

### Model references

Configuration and CLI options identify a model as `provider/model`, with an optional `#variant`:

```text theme={null}
openai/gpt-5.2
openai/gpt-5.2#high
openrouter/anthropic/claude-sonnet-4.5#high
```

OpenCode splits the reference at the first `/`, so model IDs may contain additional slashes. Provider and model IDs are
case-sensitive. Provider IDs cannot contain `/` or `#`, and model IDs cannot contain `#`.

The expanded config form is equivalent when generated or programmatic configuration is more convenient:

```jsonc theme={null}
{
  "model": {
    "providerID": "openrouter",
    "model": "anthropic/claude-sonnet-4.5"
  }
}
```

Root, agent, and command `model` fields accept both forms. Use the IDs shown by `/models`, not provider display names.

### Caveats

* The selector object uses `model`, while a provider catalog entry uses `modelID` for the upstream API identifier.
* The root `model` currently sets the default provider and model only. Although its selection shape accepts a variant,
  the V2 catalog default does not retain it; select a variant in the TUI, with `opencode2 run`, or on an agent or command.
* Model options are provider-specific. A setting accepted by one provider package may be ignored or rejected by another.
* Catalog data, credentials, and config are location-scoped. A model available in one project may be unavailable in
  another.
* Configuration files are watched and normally reload automatically, but an in-flight model request keeps the settings
  with which it started.