feat: add azure openai models (#74)

5 files changed, 221 insertions, 0 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
index 4864ef18a..b3a9861e1 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -272,6 +272,15 @@ func setProviderDefaults() {
 		viper.SetDefault("agents.title.model", models.BedrockClaude37Sonnet)
 		return
 	}
+
+	if os.Getenv("AZURE_OPENAI_ENDPOINT") != "" {
+		// api-key may be empty when using Entra ID credentials – that's okay
+		viper.SetDefault("providers.azure.apiKey", os.Getenv("AZURE_OPENAI_API_KEY"))
+		viper.SetDefault("agents.coder.model", models.AzureGPT41)
+		viper.SetDefault("agents.task.model", models.AzureGPT41Mini)
+		viper.SetDefault("agents.title.model", models.AzureGPT41Mini)
+		return
+	}
 }
 
 // hasAWSCredentials checks if AWS credentials are available in the environment.
@@ -506,6 +515,8 @@ func getProviderAPIKey(provider models.ModelProvider) string {
 		return os.Getenv("GEMINI_API_KEY")
 	case models.ProviderGROQ:
 		return os.Getenv("GROQ_API_KEY")
+	case models.ProviderAzure:
+		return os.Getenv("AZURE_OPENAI_API_KEY")
 	case models.ProviderBedrock:
 		if hasAWSCredentials() {
 			return "aws-credentials-available"
diff --git a/internal/llm/models/azure.go b/internal/llm/models/azure.go
new file mode 100644
index 000000000..6b7bac3a0
--- /dev/null
+++ b/internal/llm/models/azure.go
@@ -0,0 +1,157 @@
+package models
+
+const ProviderAzure ModelProvider = "azure"
+
+const (
+	AzureGPT41        ModelID = "azure.gpt-4.1"
+	AzureGPT41Mini    ModelID = "azure.gpt-4.1-mini"
+	AzureGPT41Nano    ModelID = "azure.gpt-4.1-nano"
+	AzureGPT45Preview ModelID = "azure.gpt-4.5-preview"
+	AzureGPT4o        ModelID = "azure.gpt-4o"
+	AzureGPT4oMini    ModelID = "azure.gpt-4o-mini"
+	AzureO1           ModelID = "azure.o1"
+	AzureO1Mini       ModelID = "azure.o1-mini"
+	AzureO3           ModelID = "azure.o3"
+	AzureO3Mini       ModelID = "azure.o3-mini"
+	AzureO4Mini       ModelID = "azure.o4-mini"
+)
+
+var AzureModels = map[ModelID]Model{
+	AzureGPT41: {
+		ID:                 AzureGPT41,
+		Name:               "Azure OpenAI – GPT 4.1",
+		Provider:           ProviderAzure,
+		APIModel:           "gpt-4.1",
+		CostPer1MIn:        OpenAIModels[GPT41].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[GPT41].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[GPT41].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[GPT41].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[GPT41].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[GPT41].DefaultMaxTokens,
+	},
+	AzureGPT41Mini: {
+		ID:                 AzureGPT41Mini,
+		Name:               "Azure OpenAI – GPT 4.1 mini",
+		Provider:           ProviderAzure,
+		APIModel:           "gpt-4.1-mini",
+		CostPer1MIn:        OpenAIModels[GPT41Mini].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[GPT41Mini].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[GPT41Mini].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[GPT41Mini].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[GPT41Mini].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[GPT41Mini].DefaultMaxTokens,
+	},
+	AzureGPT41Nano: {
+		ID:                 AzureGPT41Nano,
+		Name:               "Azure OpenAI – GPT 4.1 nano",
+		Provider:           ProviderAzure,
+		APIModel:           "gpt-4.1-nano",
+		CostPer1MIn:        OpenAIModels[GPT41Nano].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[GPT41Nano].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[GPT41Nano].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[GPT41Nano].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[GPT41Nano].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[GPT41Nano].DefaultMaxTokens,
+	},
+	AzureGPT45Preview: {
+		ID:                 AzureGPT45Preview,
+		Name:               "Azure OpenAI – GPT 4.5 preview",
+		Provider:           ProviderAzure,
+		APIModel:           "gpt-4.5-preview",
+		CostPer1MIn:        OpenAIModels[GPT45Preview].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[GPT45Preview].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[GPT45Preview].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[GPT45Preview].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[GPT45Preview].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[GPT45Preview].DefaultMaxTokens,
+	},
+	AzureGPT4o: {
+		ID:                 AzureGPT4o,
+		Name:               "Azure OpenAI – GPT-4o",
+		Provider:           ProviderAzure,
+		APIModel:           "gpt-4o",
+		CostPer1MIn:        OpenAIModels[GPT4o].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[GPT4o].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[GPT4o].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[GPT4o].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[GPT4o].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[GPT4o].DefaultMaxTokens,
+	},
+	AzureGPT4oMini: {
+		ID:                 AzureGPT4oMini,
+		Name:               "Azure OpenAI – GPT-4o mini",
+		Provider:           ProviderAzure,
+		APIModel:           "gpt-4o-mini",
+		CostPer1MIn:        OpenAIModels[GPT4oMini].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[GPT4oMini].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[GPT4oMini].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[GPT4oMini].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[GPT4oMini].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[GPT4oMini].DefaultMaxTokens,
+	},
+	AzureO1: {
+		ID:                 AzureO1,
+		Name:               "Azure OpenAI – O1",
+		Provider:           ProviderAzure,
+		APIModel:           "o1",
+		CostPer1MIn:        OpenAIModels[O1].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[O1].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[O1].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[O1].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[O1].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[O1].DefaultMaxTokens,
+		CanReason:          OpenAIModels[O1].CanReason,
+	},
+	AzureO1Mini: {
+		ID:                 AzureO1Mini,
+		Name:               "Azure OpenAI – O1 mini",
+		Provider:           ProviderAzure,
+		APIModel:           "o1-mini",
+		CostPer1MIn:        OpenAIModels[O1Mini].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[O1Mini].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[O1Mini].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[O1Mini].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[O1Mini].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[O1Mini].DefaultMaxTokens,
+		CanReason:          OpenAIModels[O1Mini].CanReason,
+	},
+	AzureO3: {
+		ID:                 AzureO3,
+		Name:               "Azure OpenAI – O3",
+		Provider:           ProviderAzure,
+		APIModel:           "o3",
+		CostPer1MIn:        OpenAIModels[O3].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[O3].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[O3].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[O3].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[O3].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[O3].DefaultMaxTokens,
+		CanReason:          OpenAIModels[O3].CanReason,
+	},
+	AzureO3Mini: {
+		ID:                 AzureO3Mini,
+		Name:               "Azure OpenAI – O3 mini",
+		Provider:           ProviderAzure,
+		APIModel:           "o3-mini",
+		CostPer1MIn:        OpenAIModels[O3Mini].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[O3Mini].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[O3Mini].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[O3Mini].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[O3Mini].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[O3Mini].DefaultMaxTokens,
+		CanReason:          OpenAIModels[O3Mini].CanReason,
+	},
+	AzureO4Mini: {
+		ID:                 AzureO4Mini,
+		Name:               "Azure OpenAI – O4 mini",
+		Provider:           ProviderAzure,
+		APIModel:           "o4-mini",
+		CostPer1MIn:        OpenAIModels[O4Mini].CostPer1MIn,
+		CostPer1MInCached:  OpenAIModels[O4Mini].CostPer1MInCached,
+		CostPer1MOut:       OpenAIModels[O4Mini].CostPer1MOut,
+		CostPer1MOutCached: OpenAIModels[O4Mini].CostPer1MOutCached,
+		ContextWindow:      OpenAIModels[O4Mini].ContextWindow,
+		DefaultMaxTokens:   OpenAIModels[O4Mini].DefaultMaxTokens,
+		CanReason:          OpenAIModels[O4Mini].CanReason,
+	},
+}
diff --git a/internal/llm/models/models.go b/internal/llm/models/models.go
index 1bc02c49d..bad0ebdaa 100644
--- a/internal/llm/models/models.go
+++ b/internal/llm/models/models.go
@@ -76,4 +76,5 @@ func init() {
 	maps.Copy(SupportedModels, OpenAIModels)
 	maps.Copy(SupportedModels, GeminiModels)
 	maps.Copy(SupportedModels, GroqModels)
+	maps.Copy(SupportedModels, AzureModels)
 }
diff --git a/internal/llm/provider/azure.go b/internal/llm/provider/azure.go
new file mode 100644
index 000000000..6368a181c
--- /dev/null
+++ b/internal/llm/provider/azure.go
@@ -0,0 +1,47 @@
+package provider
+
+import (
+	"os"
+
+	"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
+	"github.com/openai/openai-go"
+	"github.com/openai/openai-go/azure"
+	"github.com/openai/openai-go/option"
+)
+
+type azureClient struct {
+	*openaiClient
+}
+
+type AzureClient ProviderClient
+
+func newAzureClient(opts providerClientOptions) AzureClient {
+
+	endpoint := os.Getenv("AZURE_OPENAI_ENDPOINT")      // ex: https://foo.openai.azure.com
+	apiVersion := os.Getenv("AZURE_OPENAI_API_VERSION") // ex: 2025-04-01-preview
+
+	if endpoint == "" || apiVersion == "" {
+		return &azureClient{openaiClient: newOpenAIClient(opts).(*openaiClient)}
+	}
+
+	reqOpts := []option.RequestOption{
+		azure.WithEndpoint(endpoint, apiVersion),
+	}
+
+	if opts.apiKey != "" || os.Getenv("AZURE_OPENAI_API_KEY") != "" {
+		key := opts.apiKey
+		if key == "" {
+			key = os.Getenv("AZURE_OPENAI_API_KEY")
+		}
+		reqOpts = append(reqOpts, azure.WithAPIKey(key))
+	} else if cred, err := azidentity.NewDefaultAzureCredential(nil); err == nil {
+		reqOpts = append(reqOpts, azure.WithTokenCredential(cred))
+	}
+
+	base := &openaiClient{
+		providerOptions: opts,
+		client:          openai.NewClient(reqOpts...),
+	}
+
+	return &azureClient{openaiClient: base}
+}
diff --git a/internal/llm/provider/provider.go b/internal/llm/provider/provider.go
index 00b7b2978..737b6fb00 100644
--- a/internal/llm/provider/provider.go
+++ b/internal/llm/provider/provider.go
@@ -115,6 +115,11 @@ func NewProvider(providerName models.ModelProvider, opts ...ProviderClientOption
 			options: clientOptions,
 			client:  newOpenAIClient(clientOptions),
 		}, nil
+	case models.ProviderAzure:
+		return &baseProvider[AzureClient]{
+			options: clientOptions,
+			client:  newAzureClient(clientOptions),
+		}, nil
 	case models.ProviderMock:
 		// TODO: implement mock client for test
 		panic("not implemented")