opencode/packages/docs/models.mdx

---
title: "Models"
description: "Select, configure, and customize models in OpenCode 2.0."
---

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 a provider and its credentials in `opencode.json`.

## Select a model

Open the model picker with `/models` or the default `<leader>m` keybind. Use `/variants` to choose a variant for the
current model, or press `ctrl+t` to cycle through its variants.

A model reference has this form:

```text
provider/model#variant
```

The variant is optional. OpenCode splits at the first `/`, so model IDs may contain additional slashes:

```text
openai/gpt-5.2
openai/gpt-5.2#high
openrouter/anthropic/claude-sonnet-4.5#high
```

Use the catalog IDs shown by `/models`, not a provider's display name. Omit `#variant` to use the model's base settings.

### Command line

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

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

<Note>
  `opencode2 run` accepts `provider/model#variant`. The current `opencode2 mini --model` option accepts only
  `provider/model`; choose its variant from the interactive interface.
</Note>

## Set the default

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

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

The explicit object form is equivalent:

```jsonc title="opencode.jsonc"
{
  "$schema": "https://opencode.ai/config.json",
  "model": {
    "providerID": "openrouter",
    "model": "anthropic/claude-sonnet-4.5"
  }
}
```

Root, agent, and command `model` fields accept these same selection forms. See [Config](/config) for configuration
locations and precedence.

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.

## 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.

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

```jsonc title="opencode.jsonc"
{
  "$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"
              }
            }
          ]
        }
      }
    }
  },
  "commands": {
    "deep-review": {
      "description": "Review with high reasoning effort",
      "template": "Review the current changes for correctness and missing tests.",
      "model": "openai/gpt-5.2#deep"
    }
  }
}
```

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.

<Warning>
  V2 uses `providers` (plural) and an array of `{ "id": "..." }` variant entries. The V1 `provider` key and
  object-shaped `variants` configuration are not the V2 format.
</Warning>

## Configure a model

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"
{
  "$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.

## Local and compatible models

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

```jsonc title="opencode.jsonc"
{
  "$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.

## Caveats

- Provider and model IDs are case-sensitive. Provider IDs cannot contain `/` or `#`; model IDs cannot contain `#`.
- 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.