# Models

Administrators configure LLM providers and models from the Coder dashboard.
Providers, models, and centrally managed credentials are deployment-wide
settings managed by platform teams. Developers select from the set of models
that an administrator has enabled.

Optionally, administrators can allow developers to supply their own API keys
for specific providers. See [User API keys](#user-api-keys-byok) below.

## Providers

Each LLM provider has a type, a credential configuration, and an optional base URL override.

Coder supports the following provider types:

| Provider          | Description                                                      |
|-------------------|------------------------------------------------------------------|
| Anthropic         | Claude models via Anthropic API                                  |
| OpenAI            | GPT and o-series models via OpenAI API                           |
| Google            | Gemini models via Google AI API                                  |
| Azure OpenAI      | OpenAI models hosted on Azure                                    |
| AWS Bedrock       | Models via AWS Bedrock (bearer token or ambient AWS credentials) |
| OpenAI Compatible | Any endpoint implementing the OpenAI API                         |
| OpenRouter        | Multi-model routing via OpenRouter                               |
| Vercel AI Gateway | Models via Vercel AI SDK                                         |

The **OpenAI Compatible** type is a catch-all for any service that exposes an
OpenAI-compatible chat completions endpoint. Use it to connect to self-hosted
models, internal gateways, or third-party proxies like LiteLLM.

### Add a provider

1. Navigate to the **Agents** page in the Coder dashboard.
1. Open **Settings** > **Manage Agents** and select the **Providers** tab.
1. Click the provider you want to configure.
1. Enter the **API key** for the provider, if required.
1. Optionally set a **Base URL** to override the default endpoint. This is
   useful for enterprise proxies, regional endpoints, or self-hosted models.
1. Click **Save**.

<img src="../../images/guides/ai-agents/models-providers.png" alt="Screenshot of the providers list in the Agents settings">

<small>The providers list shows all supported providers and their configuration
status.</small>

<img src="../../images/guides/ai-agents/models-add-provider.png" alt="Screenshot of the add provider form">

<small>Adding a provider usually requires an API key. AWS Bedrock can also use
ambient AWS credentials. The base URL is optional.</small>

## Configuring AWS Bedrock

AWS Bedrock supports two credential modes for Agents providers:

- **Bearer token mode**: Enter a Bedrock-compatible bearer token in the
  **API key** field when you add the provider.
- **Ambient AWS credentials mode**: Leave the **API key** field empty. The
  Coder server resolves credentials from the standard AWS SDK credential chain,
  including IAM instance roles and `AWS_ACCESS_KEY_ID` /
  `AWS_SECRET_ACCESS_KEY` environment variables.

Region comes from the standard AWS SDK configuration. In most deployments, set
`AWS_REGION` on the Coder server. Bearer token mode falls back to `us-east-1`
when no region is configured. Ambient credentials require a region from the
standard AWS SDK chain, for example `AWS_REGION`.

The **Base URL** field overrides the Bedrock runtime endpoint. Use it for
custom endpoints or VPC endpoints.

> [!NOTE]
> Agents Bedrock provider configuration is separate from AI Gateway Bedrock
> flags (`CODER_AI_GATEWAY_BEDROCK_*`). AI Gateway and Agents use independent
> credential paths.

## Provider credentials and security

Provider API keys entered in the dashboard are stored encrypted in the Coder
database. They are never exposed to workspaces, developers, or the browser
after initial entry. The dashboard shows only whether a key is set, not the
key itself.

When a provider uses ambient credentials, Coder resolves them from the server
environment at request time instead of storing a secret in the database.

Because the agent loop runs in the control plane, workspaces never need direct
access to LLM providers. See
[Architecture](https://coder.com/docs/ai-coder/agents/architecture.md#no-api-keys-in-workspaces) for details
on this security model.

## Key policy

Each provider has three policy flags that control how provider credentials are
sourced:

| Setting                 | Default | Description                                                                                                              |
|-------------------------|---------|--------------------------------------------------------------------------------------------------------------------------|
| Central API key         | On      | The provider uses deployment-managed credentials configured by an administrator. For most providers, this is an API key. |
| Allow user API keys     | Off     | Developers may supply their own API key for this provider.                                                               |
| Central key as fallback | Off     | When user keys are allowed, fall back to deployment-managed credentials if a developer has not set a personal key.       |

At least one credential source must be enabled. These settings appear in the
provider configuration form under **Key policy**.

The interaction between these flags determines whether a provider is available
to a given developer:

| Central key | User keys allowed | Fallback | Developer has key | Result               |
|-------------|-------------------|----------|-------------------|----------------------|
| On          | Off               | —        | —                 | Uses central key     |
| Off         | On                | —        | Yes               | Uses developer's key |
| Off         | On                | —        | No                | Unavailable          |
| On          | On                | Off      | Yes               | Uses developer's key |
| On          | On                | Off      | No                | Unavailable          |
| On          | On                | On       | Yes               | Uses developer's key |
| On          | On                | On       | No                | Uses central key     |

When a developer's personal key is present, it always takes precedence over
deployment-managed credentials. When user keys are required and fallback is
disabled, the provider is unavailable to developers who have not saved a
personal key, even if deployment-managed credentials exist. This is
intentional: it enforces that each developer authenticates with their own
credentials.

## Models

Each model belongs to a provider and has its own configuration for context limits,
generation parameters, and provider-specific options.

### Add a model

1. Open **Settings** > **Manage Agents** and select the **Models** tab.
1. Click **Add** and select the provider for the new model.
1. Enter the **Model Identifier** — the exact model string your provider
   expects (e.g., `claude-opus-4-6`, `gpt-5.3-codex`).
1. Set a **Display Name** so developers see a human-readable label in the model
   selector.
1. Set the **Context Limit** — the maximum number of tokens in the model's
   context window (e.g., `200000` for Claude Sonnet).
1. Configure any provider-specific options (see below).
1. Click **Save**.

<img src="../../images/guides/ai-agents/models-list.png" alt="Screenshot of the models list in the Agents settings">

<small>The models list shows all configured models grouped by provider.</small>

<img src="../../images/guides/ai-agents/models-add-model.png" alt="Screenshot of the add model form">

<small>Adding a model requires a model identifier, display name, and context
limit. Provider-specific options appear dynamically based on the selected
provider.</small>

### Set a default model

Click the **star icon** next to a model in the models list to make it the
default. The default model is pre-selected when developers start a new chat.
Only one model can be the default at a time.

## Model options

Every model has a set of general options and provider-specific options.
The admin UI generates these fields automatically from the provider's
configuration schema, so the available options always match the provider type.

### General options

These options apply to all providers:

| Option                | Description                                                                                      |
|-----------------------|--------------------------------------------------------------------------------------------------|
| Model Identifier      | The API model string sent to the provider (e.g., `claude-opus-4-6`).                             |
| Display Name          | The label shown to developers in the model selector.                                             |
| Context Limit         | Maximum tokens in the context window. Used to determine when context compaction triggers.        |
| Compression Threshold | Percentage (0–100) of context usage at which the agent compresses older messages into a summary. |
| Max Output Tokens     | Maximum tokens generated per model response.                                                     |
| Temperature           | Controls randomness. Lower values produce more deterministic output.                             |
| Top P                 | Nucleus sampling threshold.                                                                      |
| Top K                 | Limits token selection to the top K candidates.                                                  |
| Presence Penalty      | Penalizes tokens that have already appeared in the conversation.                                 |
| Frequency Penalty     | Penalizes tokens proportional to how often they have appeared.                                   |
| Input Price           | Optional USD price metadata for input tokens, recorded per 1M tokens.                            |
| Output Price          | Optional USD price metadata for output tokens, recorded per 1M tokens.                           |
| Cache Read Price      | Optional USD price metadata for cache read tokens, recorded per 1M tokens.                       |
| Cache Write Price     | Optional USD price metadata for cache creation/write tokens, recorded per 1M tokens.             |

### Provider-specific options

Each provider type exposes additional options relevant to its models. These
fields appear dynamically in the admin UI when you select a provider.

#### Anthropic

| Option                 | Description                                                      |
|------------------------|------------------------------------------------------------------|
| Thinking Budget Tokens | Maximum tokens allocated for extended thinking.                  |
| Effort                 | Thinking effort level (`low`, `medium`, `high`, `xhigh`, `max`). |

#### OpenAI

| Option                | Description                                                                               |
|-----------------------|-------------------------------------------------------------------------------------------|
| Reasoning Effort      | How much effort the model spends reasoning (`minimal`, `low`, `medium`, `high`, `xhigh`). |
| Max Completion Tokens | Cap on completion tokens for reasoning models.                                            |
| Parallel Tool Calls   | Whether the model can call multiple tools at once.                                        |

#### Google

| Option           | Description                                         |
|------------------|-----------------------------------------------------|
| Thinking Budget  | Maximum tokens for the model's internal reasoning.  |
| Include Thoughts | Whether to include thinking traces in the response. |

#### OpenRouter

| Option            | Description                                       |
|-------------------|---------------------------------------------------|
| Reasoning Enabled | Enable extended reasoning mode.                   |
| Reasoning Effort  | Reasoning effort level (`low`, `medium`, `high`). |

#### Vercel AI Gateway

| Option            | Description                     |
|-------------------|---------------------------------|
| Reasoning Enabled | Enable extended reasoning mode. |
| Reasoning Effort  | Reasoning effort level.         |

> [!NOTE]
> Azure OpenAI uses the same options as OpenAI. AWS Bedrock uses the same
> model configuration options as Anthropic (thinking budget, reasoning
> effort).

## How developers select models

Developers see a model selector dropdown when starting or continuing a chat on
the Agents page. The selector shows only models from providers that have valid
credentials configured. Models are grouped by provider if multiple providers
are active.

The model selector uses the following precedence to pre-select a model:

1. **Last used model** — stored in the browser's local storage.
1. **Admin-designated default** — the model marked with the star icon.
1. **First available model** — if no default is set and no history exists.

Developers cannot add their own providers or models. If no models are
configured, the chat interface displays a message directing developers to
contact an administrator.

## Model overrides

Beyond the chat-level model picker, Coder Agents supports two override
layers:

- **Subagent overrides** (admin, deployment-wide): Pin specific subagent
  contexts to a particular model. Configure them at **Agents** >
  **Settings** > **Manage Agents** > **Agents**.
- **Personal overrides** (per user, opt-in by admin): Let users override
  the model for their own root chats and delegated subagents. Admins
  enable the toggle on the same admin page; once on, each user sees an
  **Agents** tab in their personal **Agents** > **Settings**.

The configurable contexts:

| Context              | Layer        | Applies to                                                                     |
|----------------------|--------------|--------------------------------------------------------------------------------|
| **General**          | Admin + user | Write-capable subagents (`spawn_agent` with `type=general` or `computer_use`). |
| **Explore**          | Admin + user | Read-only subagents (`spawn_agent` with `type=explore`).                       |
| **Title generation** | Admin only   | Automatic title generation for new chats.                                      |
| **Root**             | User only    | The user's own root chats.                                                     |

Resolution order, evaluated per chat or subagent:

1. Personal override (when the admin gate is on and a model is set).
1. Admin subagent override.
1. The chat's selected model (or the deployment default for new chats).

If a referenced model is later disabled or deleted, that layer is skipped
and resolution falls through to the next.

> [!NOTE]
> Both override layers are experimental and may change between releases.
> The same values are available through the experimental chat
> configuration API under `/api/experimental/chats/config/`.

## User API keys (BYOK)

When an administrator enables **Allow user API keys** on a provider,
developers can supply their own API key from the Agents settings page.

### Managing personal API keys

1. Navigate to the **Agents** page in the Coder dashboard.
1. Open **Settings** and select the **API Keys** tab.
1. Each provider that allows user keys is listed with a status indicator:
   - **Key saved** — your personal key is active and will be used for requests.
   - **Using shared key** — no personal key set, but the central deployment
     key is available as a fallback.
   - **No key** — you must add a personal key before you can use this provider.
1. Enter your API key and click **Save**.

Personal API keys are encrypted at rest using the same database encryption
used for deployment-managed provider secrets. The dashboard never displays a
saved key, only whether one is set.

### How key selection works

When you start a chat, the control plane resolves which credential source to
use for each provider:

1. If you have a personal key for the provider, it is used.
1. If you do not have a personal key and central key fallback is enabled,
   deployment-managed credentials are used.
1. If you do not have a personal key and fallback is disabled, the provider
   is unavailable to you. Models from that provider will not appear in the
   model selector.

### Removing a personal key

Click **Remove** on the provider card in the API Keys settings tab. If
central key fallback is enabled, subsequent requests will use the shared
deployment-managed credentials. If fallback is disabled, the provider becomes
unavailable until you add a new personal key.

## Using an LLM proxy

Organizations that route LLM traffic through a centralized proxy — such as
Coder's AI Gateway or third parties like LiteLLM — can point any provider's **Base URL** at their proxy endpoint.

For example, to route all OpenAI traffic through Coder's AI Gateway:

1. Add or edit the **OpenAI** provider.
1. Set the **Base URL** to your AI Gateway endpoint
   (e.g., `https://example.coder.com/api/v2/aibridge/openai/v1`).
1. Enter the API key your proxy expects.

Alternatively, use the **OpenAI Compatible** provider type if your proxy serves
multiple model families through a single OpenAI-compatible endpoint.

This lets you keep existing proxy-level features like per-user budgets, rate
limiting, and audit logging while using Coder Agents as the developer interface.