feat: add Gemini transcription provider (#5830)

Co-authored-by: memoclaw <265580040+memoclaw@users.noreply.github.com>

internal/ai/ai.go

@@ -8,8 +8,6 @@ const (
 	ProviderOpenAI ProviderType = "OPENAI"
 	// ProviderOpenAICompatible is an OpenAI-compatible API endpoint.
 	ProviderOpenAICompatible ProviderType = "OPENAI_COMPATIBLE"
-	// ProviderAnthropic is Anthropic's API.
-	ProviderAnthropic ProviderType = "ANTHROPIC"
 	// ProviderGemini is Google's Gemini API.
 	ProviderGemini ProviderType = "GEMINI"
 )

internal/ai/gemini/client.go

@@ -0,0 +1,59 @@
+package gemini
+
+import (
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/pkg/errors"
+
+	"github.com/usememos/memos/internal/ai"
+)
+
+const defaultEndpoint = "https://generativelanguage.googleapis.com/v1beta"
+
+// Transcriber transcribes audio with Gemini audio understanding.
+type Transcriber struct {
+	endpoint   string
+	apiKey     string
+	httpClient *http.Client
+}
+
+// NewTranscriber creates a new Gemini transcriber.
+func NewTranscriber(config ai.ProviderConfig, options ...Option) (*Transcriber, error) {
+	endpoint := strings.TrimSpace(config.Endpoint)
+	if endpoint == "" {
+		endpoint = defaultEndpoint
+	}
+	if _, err := url.ParseRequestURI(endpoint); err != nil {
+		return nil, errors.Wrap(err, "invalid Gemini endpoint")
+	}
+	if config.APIKey == "" {
+		return nil, errors.New("Gemini API key is required")
+	}
+
+	transcriber := &Transcriber{
+		endpoint: strings.TrimRight(endpoint, "/"),
+		apiKey:   config.APIKey,
+		httpClient: &http.Client{
+			Timeout: 2 * time.Minute,
+		},
+	}
+	for _, option := range options {
+		option(transcriber)
+	}
+	return transcriber, nil
+}
+
+// Option configures a Transcriber.
+type Option func(*Transcriber)
+
+// WithHTTPClient sets the HTTP client used by the transcriber.
+func WithHTTPClient(client *http.Client) Option {
+	return func(t *Transcriber) {
+		if client != nil {
+			t.httpClient = client
+		}
+	}
+}

internal/ai/gemini/transcription.go

@@ -0,0 +1,201 @@
+package gemini
+
+import (
+	"bytes"
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"io"
+	"mime"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/pkg/errors"
+
+	"github.com/usememos/memos/internal/ai"
+)
+
+const (
+	transcriptionInstruction = `Transcribe the audio accurately. Return only the transcript text. Do not summarize, explain, or add content that is not spoken.`
+	maxInlineAudioSizeBytes  = 14 * 1024 * 1024
+)
+
+var supportedContentTypes = map[string]string{
+	"audio/wav":    "audio/wav",
+	"audio/x-wav":  "audio/wav",
+	"audio/mp3":    "audio/mp3",
+	"audio/mpeg":   "audio/mp3",
+	"audio/aiff":   "audio/aiff",
+	"audio/aac":    "audio/aac",
+	"audio/ogg":    "audio/ogg",
+	"audio/flac":   "audio/flac",
+	"audio/x-flac": "audio/flac",
+}
+
+type generateContentRequest struct {
+	Contents         []content              `json:"contents"`
+	GenerationConfig map[string]json.Number `json:"generationConfig,omitempty"`
+}
+
+type content struct {
+	Role  string `json:"role,omitempty"`
+	Parts []part `json:"parts"`
+}
+
+type part struct {
+	Text       string      `json:"text,omitempty"`
+	InlineData *inlineData `json:"inlineData,omitempty"`
+}
+
+type inlineData struct {
+	MIMEType string `json:"mimeType"`
+	Data     string `json:"data"`
+}
+
+type generateContentResponse struct {
+	Candidates []struct {
+		Content struct {
+			Parts []struct {
+				Text string `json:"text"`
+			} `json:"parts"`
+		} `json:"content"`
+	} `json:"candidates"`
+}
+
+type errorResponse struct {
+	Error struct {
+		Message string `json:"message"`
+		Status  string `json:"status"`
+	} `json:"error"`
+}
+
+// Transcribe transcribes audio with Gemini generateContent.
+func (t *Transcriber) Transcribe(ctx context.Context, request ai.TranscribeRequest) (*ai.TranscribeResponse, error) {
+	if strings.TrimSpace(request.Model) == "" {
+		return nil, errors.New("model is required")
+	}
+	if request.Audio == nil {
+		return nil, errors.New("audio is required")
+	}
+	audio, err := io.ReadAll(request.Audio)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to read audio")
+	}
+	if len(audio) == 0 {
+		return nil, errors.New("audio is required")
+	}
+	if len(audio) > maxInlineAudioSizeBytes {
+		return nil, errors.Errorf("audio is too large for Gemini inline transcription; maximum size is %d bytes", maxInlineAudioSizeBytes)
+	}
+
+	contentType, err := normalizeContentType(request.ContentType)
+	if err != nil {
+		return nil, err
+	}
+	prompt := buildTranscriptionPrompt(request.Prompt, request.Language)
+	body, err := json.Marshal(generateContentRequest{
+		Contents: []content{
+			{
+				Role: "user",
+				Parts: []part{
+					{InlineData: &inlineData{
+						MIMEType: contentType,
+						Data:     base64.StdEncoding.EncodeToString(audio),
+					}},
+					{Text: prompt},
+				},
+			},
+		},
+		GenerationConfig: map[string]json.Number{
+			"temperature": json.Number("0"),
+		},
+	})
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to marshal Gemini transcription request")
+	}
+
+	httpRequest, err := http.NewRequestWithContext(ctx, http.MethodPost, t.endpoint+"/models/"+url.PathEscape(normalizeModelName(request.Model))+":generateContent", bytes.NewReader(body))
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to create Gemini transcription request")
+	}
+	httpRequest.Header.Set("Content-Type", "application/json")
+	httpRequest.Header.Set("x-goog-api-key", t.apiKey)
+
+	httpResponse, err := t.httpClient.Do(httpRequest)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to send Gemini transcription request")
+	}
+	defer httpResponse.Body.Close()
+
+	responseBody, err := io.ReadAll(httpResponse.Body)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to read Gemini transcription response")
+	}
+	if httpResponse.StatusCode < http.StatusOK || httpResponse.StatusCode >= http.StatusMultipleChoices {
+		return nil, errors.Errorf("Gemini transcription request failed with status %d: %s", httpResponse.StatusCode, extractErrorMessage(responseBody))
+	}
+
+	var response generateContentResponse
+	if err := json.Unmarshal(responseBody, &response); err != nil {
+		return nil, errors.Wrap(err, "failed to unmarshal Gemini transcription response")
+	}
+	text := extractText(response)
+	if text == "" {
+		return nil, errors.New("Gemini transcription response did not include text")
+	}
+	return &ai.TranscribeResponse{
+		Text: text,
+	}, nil
+}
+
+func normalizeContentType(contentType string) (string, error) {
+	mediaType, _, err := mime.ParseMediaType(strings.TrimSpace(contentType))
+	if err != nil {
+		return "", errors.Wrap(err, "invalid audio content type")
+	}
+	mediaType = strings.ToLower(mediaType)
+	normalized, ok := supportedContentTypes[mediaType]
+	if !ok {
+		return "", errors.Errorf("audio content type %q is not supported by Gemini", mediaType)
+	}
+	return normalized, nil
+}
+
+func buildTranscriptionPrompt(prompt string, language string) string {
+	parts := []string{transcriptionInstruction}
+	language = strings.TrimSpace(language)
+	if language != "" {
+		parts = append(parts, "The input language is "+language+".")
+	}
+	prompt = strings.TrimSpace(prompt)
+	if prompt != "" {
+		parts = append(parts, "Context and spelling hints:\n"+prompt)
+	}
+	return strings.Join(parts, "\n\n")
+}
+
+func normalizeModelName(model string) string {
+	return strings.TrimPrefix(strings.TrimSpace(model), "models/")
+}
+
+func extractText(response generateContentResponse) string {
+	var texts []string
+	for _, candidate := range response.Candidates {
+		for _, part := range candidate.Content.Parts {
+			text := strings.TrimSpace(part.Text)
+			if text != "" {
+				texts = append(texts, text)
+			}
+		}
+	}
+	return strings.Join(texts, "\n")
+}
+
+func extractErrorMessage(responseBody []byte) string {
+	var response errorResponse
+	if err := json.Unmarshal(responseBody, &response); err == nil && response.Error.Message != "" {
+		return response.Error.Message
+	}
+	return string(responseBody)
+}

internal/ai/gemini/transcription_test.go

@@ -0,0 +1,99 @@
+package gemini
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/usememos/memos/internal/ai"
+)
+
+func TestTranscribe(t *testing.T) {
+	t.Parallel()
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+		require.Equal(t, "/v1beta/models/gemini-2.5-flash:generateContent", r.URL.Path)
+		require.Equal(t, "test-key", r.Header.Get("x-goog-api-key"))
+		require.Equal(t, "application/json", r.Header.Get("Content-Type"))
+
+		var request struct {
+			Contents []struct {
+				Parts []struct {
+					Text       string `json:"text"`
+					InlineData *struct {
+						MIMEType string `json:"mimeType"`
+						Data     string `json:"data"`
+					} `json:"inlineData"`
+				} `json:"parts"`
+			} `json:"contents"`
+			GenerationConfig map[string]json.Number `json:"generationConfig"`
+		}
+		require.NoError(t, json.NewDecoder(r.Body).Decode(&request))
+		require.Len(t, request.Contents, 1)
+		require.Len(t, request.Contents[0].Parts, 2)
+		require.NotNil(t, request.Contents[0].Parts[0].InlineData)
+		require.Equal(t, "audio/mp3", request.Contents[0].Parts[0].InlineData.MIMEType)
+		audio, err := base64.StdEncoding.DecodeString(request.Contents[0].Parts[0].InlineData.Data)
+		require.NoError(t, err)
+		require.Equal(t, "audio bytes", string(audio))
+		require.Contains(t, request.Contents[0].Parts[1].Text, "Return only the transcript text")
+		require.Contains(t, request.Contents[0].Parts[1].Text, "Context and spelling hints")
+		require.Equal(t, json.Number("0"), request.GenerationConfig["temperature"])
+
+		w.Header().Set("Content-Type", "application/json")
+		require.NoError(t, json.NewEncoder(w).Encode(map[string]any{
+			"candidates": []map[string]any{
+				{
+					"content": map[string]any{
+						"parts": []map[string]string{{"text": "hello from gemini"}},
+					},
+				},
+			},
+		}))
+	}))
+	defer server.Close()
+
+	transcriber, err := NewTranscriber(ai.ProviderConfig{
+		Endpoint: server.URL + "/v1beta",
+		APIKey:   "test-key",
+	})
+	require.NoError(t, err)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	response, err := transcriber.Transcribe(ctx, ai.TranscribeRequest{
+		Model:       "models/gemini-2.5-flash",
+		ContentType: "audio/mpeg",
+		Audio:       strings.NewReader("audio bytes"),
+		Prompt:      "Memos, Steven",
+		Language:    "en",
+	})
+	require.NoError(t, err)
+	require.Equal(t, "hello from gemini", response.Text)
+}
+
+func TestTranscribeRejectsUnsupportedContentType(t *testing.T) {
+	t.Parallel()
+
+	transcriber, err := NewTranscriber(ai.ProviderConfig{
+		Endpoint: "https://example.com/v1beta",
+		APIKey:   "test-key",
+	})
+	require.NoError(t, err)
+
+	_, err = transcriber.Transcribe(context.Background(), ai.TranscribeRequest{
+		Model:       "gemini-2.5-flash",
+		ContentType: "video/mp4",
+		Audio:       strings.NewReader("video bytes"),
+	})
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "not supported by Gemini")
+}

proto/api/v1/instance_service.proto

@@ -232,8 +232,7 @@ message InstanceSetting {
     AI_PROVIDER_TYPE_UNSPECIFIED = 0;
     OPENAI = 1;
     OPENAI_COMPATIBLE = 2;
-    ANTHROPIC = 3;
-    GEMINI = 4;
+    GEMINI = 3;
   }
 }
 

proto/gen/api/v1/instance_service.pb.go

@@ -99,8 +99,7 @@ const (
 	InstanceSetting_AI_PROVIDER_TYPE_UNSPECIFIED InstanceSetting_AIProviderType = 0
 	InstanceSetting_OPENAI                       InstanceSetting_AIProviderType = 1
 	InstanceSetting_OPENAI_COMPATIBLE            InstanceSetting_AIProviderType = 2
-	InstanceSetting_ANTHROPIC                    InstanceSetting_AIProviderType = 3
-	InstanceSetting_GEMINI                       InstanceSetting_AIProviderType = 4
+	InstanceSetting_GEMINI                       InstanceSetting_AIProviderType = 3
 )
 
 // Enum value maps for InstanceSetting_AIProviderType.
@@ -109,15 +108,13 @@ var (
 		0: "AI_PROVIDER_TYPE_UNSPECIFIED",
 		1: "OPENAI",
 		2: "OPENAI_COMPATIBLE",
-		3: "ANTHROPIC",
-		4: "GEMINI",
+		3: "GEMINI",
 	}
 	InstanceSetting_AIProviderType_value = map[string]int32{
 		"AI_PROVIDER_TYPE_UNSPECIFIED": 0,
 		"OPENAI":                       1,
 		"OPENAI_COMPATIBLE":            2,
-		"ANTHROPIC":                    3,
-		"GEMINI":                       4,
+		"GEMINI":                       3,
 	}
 )
 
@@ -1414,7 +1411,7 @@ const file_api_v1_instance_service_proto_rawDesc = "" +
 	"\x04demo\x18\x03 \x01(\bR\x04demo\x12!\n" +
 	"\finstance_url\x18\x06 \x01(\tR\vinstanceUrl\x12(\n" +
 	"\x05admin\x18\a \x01(\v2\x12.memos.api.v1.UserR\x05admin\"\x1b\n" +
-	"\x19GetInstanceProfileRequest\"\xe2\x1a\n" +
+	"\x19GetInstanceProfileRequest\"\xd3\x1a\n" +
 	"\x0fInstanceSetting\x12\x17\n" +
 	"\x04name\x18\x01 \x01(\tB\x03\xe0A\bR\x04name\x12W\n" +
 	"\x0fgeneral_setting\x18\x02 \x01(\v2,.memos.api.v1.InstanceSetting.GeneralSettingH\x00R\x0egeneralSetting\x12W\n" +
@@ -1502,15 +1499,14 @@ const file_api_v1_instance_service_proto_rawDesc = "" +
 	"\fMEMO_RELATED\x10\x03\x12\b\n" +
 	"\x04TAGS\x10\x04\x12\x10\n" +
 	"\fNOTIFICATION\x10\x05\x12\x06\n" +
-	"\x02AI\x10\x06\"p\n" +
+	"\x02AI\x10\x06\"a\n" +
 	"\x0eAIProviderType\x12 \n" +
 	"\x1cAI_PROVIDER_TYPE_UNSPECIFIED\x10\x00\x12\n" +
 	"\n" +
 	"\x06OPENAI\x10\x01\x12\x15\n" +
-	"\x11OPENAI_COMPATIBLE\x10\x02\x12\r\n" +
-	"\tANTHROPIC\x10\x03\x12\n" +
+	"\x11OPENAI_COMPATIBLE\x10\x02\x12\n" +
 	"\n" +
-	"\x06GEMINI\x10\x04:a\xeaA^\n" +
+	"\x06GEMINI\x10\x03:a\xeaA^\n" +
 	"\x1cmemos.api.v1/InstanceSetting\x12\x1binstance/settings/{setting}*\x10instanceSettings2\x0finstanceSettingB\a\n" +
 	"\x05value\"U\n" +
 	"\x19GetInstanceSettingRequest\x128\n" +

proto/gen/openapi.yaml

@@ -2420,7 +2420,6 @@ components:
                         - AI_PROVIDER_TYPE_UNSPECIFIED
                         - OPENAI
                         - OPENAI_COMPATIBLE
-                        - ANTHROPIC
                         - GEMINI
                     type: string
                     format: enum

proto/gen/store/instance_setting.pb.go

@@ -99,8 +99,7 @@ const (
 	AIProviderType_AI_PROVIDER_TYPE_UNSPECIFIED AIProviderType = 0
 	AIProviderType_OPENAI                       AIProviderType = 1
 	AIProviderType_OPENAI_COMPATIBLE            AIProviderType = 2
-	AIProviderType_ANTHROPIC                    AIProviderType = 3
-	AIProviderType_GEMINI                       AIProviderType = 4
+	AIProviderType_GEMINI                       AIProviderType = 3
 )
 
 // Enum value maps for AIProviderType.
@@ -109,15 +108,13 @@ var (
 		0: "AI_PROVIDER_TYPE_UNSPECIFIED",
 		1: "OPENAI",
 		2: "OPENAI_COMPATIBLE",
-		3: "ANTHROPIC",
-		4: "GEMINI",
+		3: "GEMINI",
 	}
 	AIProviderType_value = map[string]int32{
 		"AI_PROVIDER_TYPE_UNSPECIFIED": 0,
 		"OPENAI":                       1,
 		"OPENAI_COMPATIBLE":            2,
-		"ANTHROPIC":                    3,
-		"GEMINI":                       4,
+		"GEMINI":                       3,
 	}
 )
 
@@ -1324,15 +1321,14 @@ const file_store_instance_setting_proto_rawDesc = "" +
 	"\fMEMO_RELATED\x10\x04\x12\b\n" +
 	"\x04TAGS\x10\x05\x12\x10\n" +
 	"\fNOTIFICATION\x10\x06\x12\x06\n" +
-	"\x02AI\x10\a*p\n" +
+	"\x02AI\x10\a*a\n" +
 	"\x0eAIProviderType\x12 \n" +
 	"\x1cAI_PROVIDER_TYPE_UNSPECIFIED\x10\x00\x12\n" +
 	"\n" +
 	"\x06OPENAI\x10\x01\x12\x15\n" +
-	"\x11OPENAI_COMPATIBLE\x10\x02\x12\r\n" +
-	"\tANTHROPIC\x10\x03\x12\n" +
+	"\x11OPENAI_COMPATIBLE\x10\x02\x12\n" +
 	"\n" +
-	"\x06GEMINI\x10\x04B\x9f\x01\n" +
+	"\x06GEMINI\x10\x03B\x9f\x01\n" +
 	"\x0fcom.memos.storeB\x14InstanceSettingProtoP\x01Z)github.com/usememos/memos/proto/gen/store\xa2\x02\x03MSX\xaa\x02\vMemos.Store\xca\x02\vMemos\\Store\xe2\x02\x17Memos\\Store\\GPBMetadata\xea\x02\fMemos::Storeb\x06proto3"
 
 var (

proto/store/instance_setting.proto

@@ -166,6 +166,5 @@ enum AIProviderType {
   AI_PROVIDER_TYPE_UNSPECIFIED = 0;
   OPENAI = 1;
   OPENAI_COMPATIBLE = 2;
-  ANTHROPIC = 3;
-  GEMINI = 4;
+  GEMINI = 3;
 }

server/router/api/v1/ai_service.go

@@ -12,6 +12,7 @@ import (
 	"google.golang.org/grpc/status"
 
 	"github.com/usememos/memos/internal/ai"
+	"github.com/usememos/memos/internal/ai/gemini"
 	"github.com/usememos/memos/internal/ai/openai"
 	v1pb "github.com/usememos/memos/proto/gen/api/v1"
 	storepb "github.com/usememos/memos/proto/gen/store"
@@ -25,16 +26,22 @@ const (
 )
 
 var supportedTranscriptionContentTypes = map[string]bool{
-	"audio/mpeg":  true,
-	"audio/mp4":   true,
-	"audio/mpga":  true,
-	"audio/wav":   true,
-	"audio/x-wav": true,
-	"audio/webm":  true,
-	"audio/x-m4a": true,
-	"video/mp4":   true,
-	"video/mpeg":  true,
-	"video/webm":  true,
+	"audio/aac":    true,
+	"audio/aiff":   true,
+	"audio/flac":   true,
+	"audio/mpeg":   true,
+	"audio/mp3":    true,
+	"audio/mp4":    true,
+	"audio/mpga":   true,
+	"audio/ogg":    true,
+	"audio/wav":    true,
+	"audio/x-wav":  true,
+	"audio/x-flac": true,
+	"audio/x-m4a":  true,
+	"audio/webm":   true,
+	"video/mp4":    true,
+	"video/mpeg":   true,
+	"video/webm":   true,
 }
 
 // Transcribe transcribes an audio file using an instance AI provider.
@@ -161,8 +168,6 @@ func convertAIProviderTypeFromStore(providerType storepb.AIProviderType) ai.Prov
 		return ai.ProviderOpenAI
 	case storepb.AIProviderType_OPENAI_COMPATIBLE:
 		return ai.ProviderOpenAICompatible
-	case storepb.AIProviderType_ANTHROPIC:
-		return ai.ProviderAnthropic
 	case storepb.AIProviderType_GEMINI:
 		return ai.ProviderGemini
 	default:
@@ -174,6 +179,8 @@ func newAITranscriber(provider ai.ProviderConfig) (ai.Transcriber, error) {
 	switch provider.Type {
 	case ai.ProviderOpenAI, ai.ProviderOpenAICompatible:
 		return openai.NewTranscriber(provider)
+	case ai.ProviderGemini:
+		return gemini.NewTranscriber(provider)
 	default:
 		return nil, errors.Wrapf(ai.ErrCapabilityUnsupported, "provider type %q", provider.Type)
 	}

server/router/api/v1/test/ai_service_test.go

@@ -97,6 +97,63 @@ func TestTranscribe(t *testing.T) {
 		require.Equal(t, "transcribed text", resp.Text)
 	})
 
+	t.Run("transcribes audio file with Gemini provider", func(t *testing.T) {
+		ts := NewTestService(t)
+		defer ts.Cleanup()
+
+		user, err := ts.CreateRegularUser(ctx, "gemini-user")
+		require.NoError(t, err)
+		userCtx := ts.CreateUserContext(ctx, user.ID)
+
+		geminiServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			require.Equal(t, "/v1beta/models/gemini-2.5-flash:generateContent", r.URL.Path)
+			require.Equal(t, "gemini-key", r.Header.Get("x-goog-api-key"))
+			w.Header().Set("Content-Type", "application/json")
+			require.NoError(t, json.NewEncoder(w).Encode(map[string]any{
+				"candidates": []map[string]any{
+					{
+						"content": map[string]any{
+							"parts": []map[string]string{{"text": "gemini transcript"}},
+						},
+					},
+				},
+			}))
+		}))
+		defer geminiServer.Close()
+
+		_, err = ts.Store.UpsertInstanceSetting(ctx, &storepb.InstanceSetting{
+			Key: storepb.InstanceSettingKey_AI,
+			Value: &storepb.InstanceSetting_AiSetting{
+				AiSetting: &storepb.InstanceAISetting{
+					Providers: []*storepb.AIProviderConfig{
+						{
+							Id:           "gemini-main",
+							Title:        "Gemini",
+							Type:         storepb.AIProviderType_GEMINI,
+							Endpoint:     geminiServer.URL + "/v1beta",
+							ApiKey:       "gemini-key",
+							Models:       []string{"gemini-2.5-flash"},
+							DefaultModel: "gemini-2.5-flash",
+						},
+					},
+				},
+			},
+		})
+		require.NoError(t, err)
+
+		resp, err := ts.Service.Transcribe(userCtx, &v1pb.TranscribeRequest{
+			ProviderId: "gemini-main",
+			Config:     &v1pb.TranscriptionConfig{},
+			Audio: &v1pb.TranscriptionAudio{
+				Source:      &v1pb.TranscriptionAudio_Content{Content: []byte("mp3 bytes")},
+				Filename:    "voice.mp3",
+				ContentType: "audio/mp3",
+			},
+		})
+		require.NoError(t, err)
+		require.Equal(t, "gemini transcript", resp.Text)
+	})
+
 	t.Run("rejects unconfigured model", func(t *testing.T) {
 		ts := NewTestService(t)
 		defer ts.Cleanup()

web/src/components/Settings/AISection.tsx

@@ -41,7 +41,6 @@ type LocalAIProvider = {
 const providerTypeOptions = [
   InstanceSetting_AIProviderType.OPENAI,
   InstanceSetting_AIProviderType.OPENAI_COMPATIBLE,
-  InstanceSetting_AIProviderType.ANTHROPIC,
   InstanceSetting_AIProviderType.GEMINI,
 ];