Add OpenAI Whisper Audio Transcription Support

.gitignore

@@ -116,3 +116,4 @@ storybook-static
 .claude
 
 .turbo
+tsx-0/

packages/app/server/src/providers/OpenAIAudioProvider.ts

@@ -0,0 +1,93 @@
+import { Decimal } from '@prisma/client/runtime/library';
+import { Transaction } from '../types';
+import { BaseProvider } from './BaseProvider';
+import { ProviderType } from './ProviderType';
+import logger from '../logger';
+import OpenAI from 'openai';
+
+export class OpenAIAudioProvider extends BaseProvider {
+  private client: OpenAI;
+
+  constructor(stream: boolean, model: string) {
+    super(stream, model);
+    const apiKey = this.getApiKey();
+    if (!apiKey) {
+      throw new Error('OpenAI API key is required for audio provider');
+    }
+    this.client = new OpenAI({ apiKey });
+  }
+
+  getType(): ProviderType {
+    return ProviderType.OPENAI_AUDIO;
+  }
+
+  getBaseUrl(): string {
+    return this.OPENAI_BASE_URL;
+  }
+
+  getApiKey(): string | undefined {
+    return process.env.OPENAI_API_KEY;
+  }
+
+  async handleBody(data: string): Promise<Transaction> {
+    try {
+      const audioResponse = JSON.parse(data) as {
+        text: string;
+        duration?: number;
+        language?: string;
+      };
+
+      const durationSeconds = audioResponse.duration || 0;
+      const durationMinutes = durationSeconds / 60;
+      const costPerMinute = 0.006;
+      const totalCost = new Decimal(durationMinutes * costPerMinute);
+
+      const transaction: Transaction = {
+        metadata: {
+          providerId: 'openai-audio',
+          provider: 'openai',
+          model: this.getModel(),
+          durationSeconds,
+          generateAudio: false
+        },
+        rawTransactionCost: totalCost,
+        status: 'success',
+      };
+
+      logger.info('Audio transcription transaction:', {
+        model: this.getModel(),
+        cost: totalCost.toNumber(),
+        durationMinutes,
+        userId: this.getUserId(),
+      });
+
+      return transaction;
+    } catch (error) {
+      logger.error('Error processing audio response:', error);
+      throw error;
+    }
+  }
+
+  override supportsStream(): boolean {
+    // OpenAI supports streaming for audio with verbose_json response format
+    return true;
+  }
+
+  override ensureStreamUsage(
+    reqBody: Record<string, unknown>,
+    reqPath: string
+  ): Record<string, unknown> {
+    return reqBody;
+  }
+
+  override transformRequestBody(
+    reqBody: Record<string, unknown>,
+    reqPath: string
+  ): Record<string, unknown> {
+    // Force verbose_json format to get duration field for cost calculation
+    return {
+      ...reqBody,
+      response_format: 'verbose_json'
+    };
+  }
+}

packages/app/server/src/providers/ProviderFactory.ts

@@ -3,6 +3,7 @@ import {
   ALL_SUPPORTED_IMAGE_MODELS,
   ALL_SUPPORTED_MODELS,
   ALL_SUPPORTED_VIDEO_MODELS,
+  ALL_SUPPORTED_AUDIO_MODELS,
 } from '../services/AccountingService';
 import type { EchoControlService } from '../services/EchoControlService';
 import { AnthropicGPTProvider } from './AnthropicGPTProvider';
@@ -17,6 +18,7 @@ import {
   PROXY_PASSTHROUGH_ONLY_MODEL as GeminiVeoProxyPassthroughOnlyModel,
 } from './GeminiVeoProvider';
 import { GPTProvider } from './GPTProvider';
+import { OpenAIAudioProvider } from './OpenAIAudioProvider';
 import { OpenAIImageProvider } from './OpenAIImageProvider';
 import { OpenAIResponsesProvider } from './OpenAIResponsesProvider';
 import { OpenRouterProvider } from './OpenRouterProvider';
@@ -97,6 +99,19 @@ const createVideoModelToProviderMapping = (): Record<string, ProviderType> => {
   return mapping;
 };
 
+
+const createAudioModelToProviderMapping = (): Record<string, ProviderType> => {
+  const mapping: Record<string, ProviderType> = {};
+
+  for (const modelConfig of ALL_SUPPORTED_AUDIO_MODELS) {
+    if (modelConfig.provider === 'OpenAI') {
+      mapping[modelConfig.model_id] = ProviderType.OPENAI_AUDIO;
+    }
+  }
+
+  return mapping;
+};
+
 /**
  * Model-to-provider mapping loaded from model_prices_and_context_window.json
  * This replaces the previous hardcoded mapping and automatically includes all
@@ -111,6 +126,9 @@ export const IMAGE_MODEL_TO_PROVIDER: Record<string, ProviderType> =
 export const VIDEO_MODEL_TO_PROVIDER: Record<string, ProviderType> =
   createVideoModelToProviderMapping();
 
+export const AUDIO_MODEL_TO_PROVIDER: Record<string, ProviderType> =
+  createAudioModelToProviderMapping();
+
 export const getProvider = (
   model: string,
   stream: boolean,
@@ -129,6 +147,11 @@ export const getProvider = (
     type = videoType;
   }
 
+  const audioType = AUDIO_MODEL_TO_PROVIDER[model];
+  if (audioType) {
+    type = audioType;
+  }
+
   if (model === GeminiVeoProxyPassthroughOnlyModel) {
     type = ProviderType.GEMINI_VEO;
   }
@@ -151,6 +174,11 @@ export const getProvider = (
     type = ProviderType.OPENAI_IMAGES;
   }
 
+  // Check if this is an audio transcription or translation endpoint
+  if (completionPath.includes('audio/transcriptions') || completionPath.includes('audio/translations')) {
+    type = ProviderType.OPENAI_AUDIO;
+  }
+
   // We select for Anthropic Native if the completionPath includes "messages"
   // The OpenAI Format does not hit /v1/messages, it hits /v1/chat/completions
   // but the anthropic native format hits /v1/messages
@@ -190,6 +218,8 @@ export const getProvider = (
       return new OpenAIVideoProvider(stream, model);
     case ProviderType.GROQ:
       return new GroqProvider(stream, model);
+    case ProviderType.OPENAI_AUDIO:
+      return new OpenAIAudioProvider(stream, model);
     case ProviderType.XAI:
       return new XAIProvider(stream, model);
     default:

packages/app/server/src/providers/ProviderType.ts

@@ -11,5 +11,6 @@ export enum ProviderType {
   OPENAI_IMAGES = 'OPENAI_IMAGES',
   OPENAI_VIDEOS = 'OPENAI_VIDEOS',
   GROQ = 'GROQ',
+  OPENAI_AUDIO = 'OPENAI_AUDIO',
   XAI = 'XAI',
 }

packages/app/server/src/services/AccountingService.ts

@@ -5,10 +5,12 @@ import {
   OpenRouterModels,
   GroqModels,
   OpenAIImageModels,
+  OpenAIAudioModels,
   SupportedOpenAIResponseToolPricing,
   SupportedModel,
   SupportedImageModel,
   SupportedVideoModel,
+  SupportedAudioModel,
   XAIModels,
 } from '@merit-systems/echo-typescript-sdk';
 
@@ -42,6 +44,10 @@ export const ALL_SUPPORTED_VIDEO_MODELS: SupportedVideoModel[] = [
   ...OpenAIVideoModels,
 ];
 
+export const ALL_SUPPORTED_AUDIO_MODELS: SupportedAudioModel[] = [
+  ...OpenAIAudioModels,
+];
+
 // Create a lookup map for O(1) model price retrieval
 const MODEL_PRICE_MAP = new Map<string, SupportedModel>();
 ALL_SUPPORTED_MODELS.forEach(model => {
@@ -60,6 +66,12 @@ ALL_SUPPORTED_VIDEO_MODELS.forEach(model => {
   VIDEO_MODEL_MAP.set(model.model_id, model);
 });
 
+// Create a separate map for audio models
+const AUDIO_MODEL_MAP = new Map<string, SupportedAudioModel>();
+ALL_SUPPORTED_AUDIO_MODELS.forEach(model => {
+  AUDIO_MODEL_MAP.set(model.model_id, model);
+});
+
 export const getModelPrice = (model: string) => {
   const supportedModel = MODEL_PRICE_MAP.get(model);
 
@@ -114,6 +126,10 @@ export const isValidVideoModel = (model: string) => {
   return VIDEO_MODEL_MAP.has(model);
 };
 
+export const isValidAudioModel = (model: string) => {
+  return AUDIO_MODEL_MAP.has(model);
+};
+
 export const getCostPerToken = (
   model: string,
   inputTokens: number,

packages/app/server/src/services/EchoControlService.ts

@@ -32,7 +32,7 @@ export class EchoControlService {
 
   constructor(db: PrismaClient, apiKey: string) {
     // Check if the generated Prisma client exists
-    const generatedPrismaPath = join(__dirname, 'generated', 'prisma');
+    const generatedPrismaPath = join(__dirname, '..', 'generated', 'prisma');
     if (!existsSync(generatedPrismaPath)) {
       throw new Error(
         `Generated Prisma client not found at ${generatedPrismaPath}. ` +

packages/app/server/src/services/PricingService.ts

@@ -5,6 +5,7 @@ import {
   getVideoModelPrice,
   isValidImageModel,
   isValidVideoModel,
+  isValidAudioModel,
   calculateToolCost,
   getImageModelPrice,
 } from './AccountingService';
@@ -26,8 +27,11 @@ export function getRequestMaxCost(
   provider: BaseProvider,
   isPassthroughProxyRoute: boolean
 ): Decimal {
-  // Need to switch between language/image/video for different pricing models.
-  if (isValidVideoModel(provider.getModel())) {
+  if (isValidAudioModel(provider.getModel())) {
+    const fileSizeBytes = Number(req.originalContentLength) || 1024 * 1024;
+    const estimatedMinutes = Math.max(1, fileSizeBytes / (1024 * 1024));
+    return new Decimal(estimatedMinutes * 0.006);
+  } else if (isValidVideoModel(provider.getModel())) {
     const videoModelWithPricing = getVideoModelPrice(provider.getModel());
     if (!videoModelWithPricing) {
       throw new UnknownModelError(

packages/app/server/src/services/ProviderInitializationService.ts

@@ -11,6 +11,7 @@ import {
   isValidImageModel,
   isValidModel,
   isValidVideoModel,
+  isValidAudioModel,
 } from './AccountingService';
 import { extractIsStream, extractModelName } from './RequestDataService';
 
@@ -67,7 +68,8 @@ export async function initializeProvider(
     !model ||
     (!isValidModel(model) &&
       !isValidImageModel(model) &&
-      !isValidVideoModel(model))
+      !isValidVideoModel(model) &&
+      !isValidAudioModel(model))
   ) {
     logger.warn(`Invalid model: ${model}`);
     // if auth or x402 header, return 422