feat: add Opper as an OpenAI-compatible provider alias

agent-schema.json

@@ -224,7 +224,7 @@
       "properties": {
         "provider": {
           "type": "string",
-          "description": "The underlying provider type. Defaults to \"openai\" when not set. Supported values: openai, anthropic, google, amazon-bedrock, dmr, and any built-in alias (requesty, openrouter, api-route, atlascloud, azure, xai, ollama, mistral, baseten, daoxe, ovhcloud, groq, fireworks-ai, deepseek, cerebras, togetherai, huggingface, moonshotai, vercel, cloudflare-workers-ai, cloudflare-ai-gateway, nvidia, github-copilot, chatgpt, opencode, opencode-go, etc.).",
+          "description": "The underlying provider type. Defaults to \"openai\" when not set. Supported values: openai, anthropic, google, amazon-bedrock, dmr, and any built-in alias (requesty, openrouter, opper, api-route, atlascloud, azure, xai, ollama, mistral, baseten, daoxe, ovhcloud, groq, fireworks-ai, deepseek, cerebras, togetherai, huggingface, moonshotai, vercel, cloudflare-workers-ai, cloudflare-ai-gateway, nvidia, github-copilot, chatgpt, opencode, opencode-go, etc.).",
           "examples": [
             "openai",
             "anthropic",

docs/configuration/models/index.md

@@ -18,7 +18,7 @@ models:
     first_available: [list] # Optional: candidate model refs, tried in order by available credentials.
                             # Mutually exclusive with other model settings.
     provider: string # Required unless using first_available. One of: openai, anthropic, google, amazon-bedrock,
-                     # dmr, mistral, xai, nebius, nvidia, minimax, baseten, daoxe, ovhcloud, groq, fireworks-ai, deepseek, cerebras, togetherai, huggingface, moonshotai, vercel, cloudflare-workers-ai, cloudflare-ai-gateway, requesty, openrouter, api-route, atlascloud,
+                     # dmr, mistral, xai, nebius, nvidia, minimax, baseten, daoxe, ovhcloud, groq, fireworks-ai, deepseek, cerebras, togetherai, huggingface, moonshotai, vercel, cloudflare-workers-ai, cloudflare-ai-gateway, requesty, openrouter, opper, api-route, atlascloud,
                      # azure, ollama, github-copilot, or a named provider defined
                      # under the top-level `providers:` section.
     model: string # Required: model identifier
@@ -60,7 +60,7 @@ models:
 | Property              | Type       | Required | Description                                                                           |
 | --------------------- | ---------- | -------- | ------------------------------------------------------------------------------------- |
 | `first_available`     | array      | ✗        | Candidate model references tried in order; selects the first whose credentials are configured. Mutually exclusive with other model settings. |
-| `provider`            | string     | ✓/✗      | Required for regular model definitions; omitted for `first_available` selectors. Provider: `openai`, `anthropic`, `google`, `amazon-bedrock`, `dmr`, `mistral`, `xai`, `nebius`, `nvidia`, `minimax`, `baseten`, `daoxe`, `ovhcloud`, `groq`, `fireworks-ai`, `deepseek`, `cerebras`, `togetherai`, `huggingface`, `moonshotai`, `vercel`, `cloudflare-workers-ai`, `cloudflare-ai-gateway`, `requesty`, `openrouter`, `api-route`, `atlascloud`, `azure`, `ollama`, `github-copilot`, `chatgpt`, `opencode`, `opencode-go`, or any [named provider](../../providers/custom/index.md). |
+| `provider`            | string     | ✓/✗      | Required for regular model definitions; omitted for `first_available` selectors. Provider: `openai`, `anthropic`, `google`, `amazon-bedrock`, `dmr`, `mistral`, `xai`, `nebius`, `nvidia`, `minimax`, `baseten`, `daoxe`, `ovhcloud`, `groq`, `fireworks-ai`, `deepseek`, `cerebras`, `togetherai`, `huggingface`, `moonshotai`, `vercel`, `cloudflare-workers-ai`, `cloudflare-ai-gateway`, `requesty`, `openrouter`, `opper`, `api-route`, `atlascloud`, `azure`, `ollama`, `github-copilot`, `chatgpt`, `opencode`, `opencode-go`, or any [named provider](../../providers/custom/index.md). |
 | `model`               | string     | ✓/✗      | Required for regular model definitions; omitted for `first_available` selectors. Model name (e.g., `gpt-4o`, `claude-sonnet-4-5`, `gemini-3.5-flash`) |
 | `description`         | string     | ✗        | Informational, human-readable summary of the model's purpose or strengths (e.g., "fast and cheap, good for summaries"). Not sent to the model. Can be combined with `first_available` (a selector's description is kept when it resolves). |
 | `temperature`         | float      | ✗        | Sampling randomness. Range is provider-dependent — typically `0.0–2.0` (Anthropic caps at `1.0`). `0.0` is deterministic. |
@@ -558,7 +558,7 @@ for a complete local-server configuration.
 ## Custom HTTP Headers
 
 For OpenAI-compatible providers (`openai`, `github-copilot`, `mistral`, `xai`,
-`nebius`, `nvidia`, `minimax`, `baseten`, `daoxe`, `ovhcloud`, `groq`, `fireworks-ai`, `deepseek`, `cerebras`, `togetherai`, `huggingface`, `moonshotai`, `vercel`, `cloudflare-workers-ai`, `cloudflare-ai-gateway`, `requesty`, `openrouter`, `atlascloud`, `ollama`, and any custom provider using the OpenAI API),
+`nebius`, `nvidia`, `minimax`, `baseten`, `daoxe`, `ovhcloud`, `groq`, `fireworks-ai`, `deepseek`, `cerebras`, `togetherai`, `huggingface`, `moonshotai`, `vercel`, `cloudflare-workers-ai`, `cloudflare-ai-gateway`, `requesty`, `openrouter`, `opper`, `atlascloud`, `ollama`, and any custom provider using the OpenAI API),
 `provider_opts.http_headers` adds arbitrary HTTP headers to every outgoing
 request:
 

docs/data/nav.yml

@@ -227,6 +227,8 @@
       url: /providers/opencode-go/
     - title: OpenCode Zen
       url: /providers/opencode-zen/
+    - title: Opper
+      url: /providers/opper/
     - title: OpenRouter
       url: /providers/openrouter/
     - title: OVHcloud

docs/providers/opper/index.md

@@ -0,0 +1,69 @@
+---
+title: "Opper"
+description: "Use Opper models with Docker Agent."
+keywords: docker agent, ai agents, model providers, llm, opper
+weight: 225
+canonical: https://docs.docker.com/ai/docker-agent/providers/opper/
+---
+
+_Use Opper models with Docker Agent._
+
+## Overview
+
+[Opper](https://opper.ai) is an EU-hosted AI gateway that serves models from
+many providers behind one OpenAI-compatible endpoint, with one API key.
+Docker Agent includes built-in support for Opper as an alias provider.
+
+## Setup
+
+1. Create an API key at [platform.opper.ai](https://platform.opper.ai).
+2. Set the environment variable:
+
+   ```bash
+   export OPPER_API_KEY=your-api-key
+   ```
+
+## Usage
+
+### Inline Syntax
+
+```yaml
+agents:
+  root:
+    model: opper/claude-sonnet-4-6
+    description: Assistant using Opper
+    instruction: You are a helpful assistant.
+```
+
+### Named Model
+
+```yaml
+models:
+  opper_model:
+    provider: opper
+    model: claude-sonnet-4-6
+    temperature: 0.7
+    max_tokens: 8192
+
+agents:
+  root:
+    model: opper_model
+    description: Assistant using Opper
+    instruction: You are a helpful assistant.
+```
+
+## Available Models
+
+Opper model IDs come in two forms. A bare pool name such as
+`claude-sonnet-4-6` or `gpt-5.4-mini` lets Opper pick a provider for each
+request. A `provider/model` ID such as `anthropic/claude-sonnet-4-6` pins one
+route. List the model IDs your key can call with:
+
+```bash
+curl https://api.opper.ai/v3/compat/models \
+  -H "Authorization: Bearer $OPPER_API_KEY"
+```
+
+The public catalogue is also available without a key at
+`https://api.opper.ai/v3/models`. Docker Agent's default for Opper is
+`claude-sonnet-4-6`.

docs/providers/overview/index.md

@@ -67,6 +67,7 @@ Use this table to find a built-in provider's config key and authentication metho
 | Cloudflare AI Gateway | `cloudflare-ai-gateway` | `CLOUDFLARE_API_TOKEN` + `CLOUDFLARE_ACCOUNT_ID` + `CLOUDFLARE_GATEWAY_ID` |
 | Requesty       | `requesty`       | `REQUESTY_API_KEY`                  |
 | OpenRouter     | `openrouter`     | `OPENROUTER_API_KEY`                |
+| Opper          | `opper`          | `OPPER_API_KEY`                     |
 | API Route      | `api-route`      | `API_ROUTE_API_KEY`                 |
 | Atlas Cloud    | [`atlascloud`](../atlascloud/index.md) | `ATLASCLOUD_API_KEY`                |
 | Azure OpenAI   | `azure`          | `AZURE_API_KEY` + `base_url` (override the key with `token_key`) |

examples/README.md

@@ -210,6 +210,7 @@ remote MCP endpoints.
 | [`atlascloud.yaml`](atlascloud.yaml) | Atlas Cloud open-model host (`atlascloud`). |
 | [`baseten.yaml`](baseten.yaml) | Baseten cloud provider. |
 | [`daoxe.yaml`](daoxe.yaml) | DaoXE multi-model gateway provider. |
+| [`opper.yaml`](opper.yaml) | Opper multi-model gateway provider. |
 | [`ovhcloud.yaml`](ovhcloud.yaml) | OVHcloud AI Endpoints provider. |
 | [`groq.yaml`](groq.yaml) | Groq fast-inference provider. |
 | [`fireworks.yaml`](fireworks.yaml) | Fireworks AI open-model inference (`fireworks-ai`). |

examples/opper.yaml

@@ -0,0 +1,17 @@
+# yaml-language-server: $schema=../agent-schema.json
+
+models:
+  opper_model:
+    provider: opper
+    model: claude-sonnet-4-6
+
+agents:
+  root:
+    model: opper_model
+    description: Assistant using Opper
+    instruction: |
+      You are a helpful assistant.
+    toolsets:
+      - type: filesystem
+      - type: shell
+      - type: think

pkg/config/auto.go

@@ -64,6 +64,7 @@ var cloudProviders = []providerConfig{
 	{"openrouter", []string{"OPENROUTER_API_KEY"}, "OPENROUTER_API_KEY", "OPENROUTER_API_KEY"},
 	{"api-route", []string{"API_ROUTE_API_KEY"}, "API_ROUTE_API_KEY", "API_ROUTE_API_KEY"},
 	{"atlascloud", []string{"ATLASCLOUD_API_KEY"}, "ATLASCLOUD_API_KEY", "ATLASCLOUD_API_KEY"},
+	{"opper", []string{"OPPER_API_KEY"}, "OPPER_API_KEY", "OPPER_API_KEY"},
 	{"baseten", []string{"BASETEN_API_KEY"}, "BASETEN_API_KEY", "BASETEN_API_KEY"},
 	{"ovhcloud", []string{"OVH_AI_ENDPOINTS_ACCESS_TOKEN"}, "OVH_AI_ENDPOINTS_ACCESS_TOKEN", "OVH_AI_ENDPOINTS_ACCESS_TOKEN"},
 	{"daoxe", []string{"DAOXE_API_KEY"}, "DAOXE_API_KEY", "DAOXE_API_KEY"},
@@ -163,6 +164,7 @@ var DefaultModels = map[string]string{
 	"openrouter":     "meta-llama/llama-4-maverick",
 	"api-route":      "gpt-6.1-sol",
 	"atlascloud":     "qwen/qwen3.8-max",
+	"opper":          "claude-sonnet-4-6",
 	"baseten":        "deepseek-ai/DeepSeek-V4-Pro",
 	"ovhcloud":       "Qwen3.5-397B-A17B",
 	"daoxe":          "claude-sonnet-4-6",

pkg/config/auto_test.go

@@ -88,6 +88,13 @@ func TestAvailableProviders_NoGateway(t *testing.T) {
 			},
 			expectedProvider: "atlascloud",
 		},
+		{
+			name: "opper api key present",
+			envVars: map[string]string{
+				"OPPER_API_KEY": "test-key",
+			},
+			expectedProvider: "opper",
+		},
 		{
 			name: "baseten api key present",
 			envVars: map[string]string{
@@ -336,6 +343,15 @@ func TestAutoModelConfig(t *testing.T) {
 			expectedModel:     "gpt-6.1-sol",
 			expectedMaxTokens: 32000,
 		},
+		{
+			name: "opper provider",
+			envVars: map[string]string{
+				"OPPER_API_KEY": "test-key",
+			},
+			expectedProvider:  "opper",
+			expectedModel:     "claude-sonnet-4-6",
+			expectedMaxTokens: 32000,
+		},
 		{
 			name: "baseten provider",
 			envVars: map[string]string{

pkg/model/provider/aliases.go

@@ -75,6 +75,11 @@ var Aliases = map[string]Alias{
 		BaseURL:     "https://api.atlascloud.ai/v1",
 		TokenEnvVar: "ATLASCLOUD_API_KEY",
 	},
+	"opper": {
+		APIType:     "openai",
+		BaseURL:     "https://api.opper.ai/v3/compat",
+		TokenEnvVar: "OPPER_API_KEY",
+	},
 	"mistral": {
 		APIType:     "openai",
 		BaseURL:     "https://api.mistral.ai/v1",

pkg/model/provider/aliases_test.go

@@ -41,6 +41,7 @@ func TestCatalogAliases(t *testing.T) {
 		"openrouter":   {APIType: "openai", BaseURL: "https://openrouter.ai/api/v1", TokenEnvVar: "OPENROUTER_API_KEY"},
 		"api-route":    {APIType: "openai", BaseURL: "https://global.api-route.com/v1", TokenEnvVar: "API_ROUTE_API_KEY"},
 		"atlascloud":   {APIType: "openai", BaseURL: "https://api.atlascloud.ai/v1", TokenEnvVar: "ATLASCLOUD_API_KEY"},
+		"opper":        {APIType: "openai", BaseURL: "https://api.opper.ai/v3/compat", TokenEnvVar: "OPPER_API_KEY"},
 		"baseten":      {APIType: "openai", BaseURL: "https://inference.baseten.co/v1", TokenEnvVar: "BASETEN_API_KEY"},
 		"daoxe":        {APIType: "openai", BaseURL: "https://api.daoxe.com/v1", TokenEnvVar: "DAOXE_API_KEY"},
 		"ovhcloud":     {APIType: "openai", BaseURL: "https://oai.endpoints.kepler.ai.cloud.ovh.net/v1", TokenEnvVar: "OVH_AI_ENDPOINTS_ACCESS_TOKEN"},

pkg/model/provider/openai/client.go

@@ -268,6 +268,7 @@ var openModelHostProviders = map[string]bool{
 	"daoxe":        true,
 	"ovhcloud":     true,
 	"openrouter":   true,
+	"opper":        true,
 	"nebius":       true,
 	"nvidia":       true,
 	"cerebras":     true,

pkg/model/provider/openai/system_message_merge_test.go

@@ -45,6 +45,16 @@ func TestDaoxe_MergesConsecutiveSystemMessages(t *testing.T) {
 	})
 }
 
+func TestOpper_MergesConsecutiveSystemMessages(t *testing.T) {
+	t.Parallel()
+
+	assertMergesConsecutiveMessages(t, &latest.ModelConfig{
+		Provider: "opper",
+		Model:    "claude-sonnet-4-6",
+		TokenKey: "MY_TOKEN",
+	})
+}
+
 func TestBaseten_MergesConsecutiveSystemMessages(t *testing.T) {
 	t.Parallel()
 
@@ -172,6 +182,7 @@ func TestShouldMergeConsecutiveMessages_Gating(t *testing.T) {
 		{"api-route, no base_url", &latest.ModelConfig{Provider: "api-route", Model: "gpt-6.1-sol"}, true},
 		{"baseten", &latest.ModelConfig{Provider: "baseten", Model: "zai-org/GLM-5.2"}, true},
 		{"daoxe, no base_url", &latest.ModelConfig{Provider: "daoxe", Model: "claude-sonnet-4-6"}, true},
+		{"opper, no base_url", &latest.ModelConfig{Provider: "opper", Model: "claude-sonnet-4-6"}, true},
 		{"ovhcloud", &latest.ModelConfig{Provider: "ovhcloud", Model: "Qwen3.5-397B-A17B"}, true},
 		{"open-model host alias cerebras", &latest.ModelConfig{Provider: "cerebras", Model: "qwen-3-coder-480b"}, true},
 		{"open-model host fireworks", &latest.ModelConfig{Provider: "fireworks", Model: "accounts/fireworks/models/kimi-k3"}, true},