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AssemblyAI auto-scales limits for paid users.\n\n## Prerequisites\n- `assemblyai` package installed\n- Understanding of async\u002Fawait patterns\n\n## Rate Limit Tiers (Actual)\n\n### Async Transcription API\n| Endpoint | Free | Pay-as-you-go |\n|----------|------|---------------|\n| `POST \u002Fv2\u002Ftranscript` | 5\u002Fmin | Scales with usage |\n| `GET \u002Fv2\u002Ftranscript\u002F:id` | No hard limit | No hard limit |\n| `POST \u002Fv2\u002Fupload` | 5\u002Fmin | Scales with usage |\n\n### Streaming (WebSocket)\n| Metric | Free | Pay-as-you-go |\n|--------|------|---------------|\n| New streams\u002Fmin | 5 | 100 (auto-scales) |\n| Concurrent streams | ~5 | Unlimited (auto-scales 10% every 60s at 70% usage) |\n\n### LeMUR\n| Metric | Free | Paid |\n|--------|------|------|\n| Requests\u002Fmin | Limited | Scales with usage |\n| Max audio input | 100 hours per request | 100 hours per request |\n\n**Note:** AssemblyAI auto-scales paid limits. At 70%+ utilization, the new session rate limit increases by 10% every 60 seconds with no ceiling cap.\n\n## Instructions\n\n### Step 1: Exponential Backoff with Jitter\n\n```typescript\nimport { AssemblyAI, type Transcript } from 'assemblyai';\n\nconst client = new AssemblyAI({\n  apiKey: process.env.ASSEMBLYAI_API_KEY!,\n});\n\nasync function transcribeWithBackoff(\n  audioUrl: string,\n  options: Record\u003Cstring, any> = {},\n  config = { maxRetries: 5, baseDelayMs: 1000, maxDelayMs: 30000 }\n): Promise\u003CTranscript> {\n  for (let attempt = 0; attempt \u003C= config.maxRetries; attempt++) {\n    try {\n      return await client.transcripts.transcribe({\n        audio: audioUrl,\n        ...options,\n      });\n    } catch (err: any) {\n      if (attempt === config.maxRetries) throw err;\n\n      const status = err.status ?? err.statusCode;\n      \u002F\u002F Only retry on 429 (rate limit) and 5xx (server errors)\n      if (status && status !== 429 && (status \u003C 500 || status >= 600)) throw err;\n\n      const exponentialDelay = config.baseDelayMs * Math.pow(2, attempt);\n      const jitter = Math.random() * config.baseDelayMs;\n      const delay = Math.min(exponentialDelay + jitter, config.maxDelayMs);\n\n      console.warn(`[${attempt + 1}\u002F${config.maxRetries}] Retrying in ${delay.toFixed(0)}ms...`);\n      await new Promise(r => setTimeout(r, delay));\n    }\n  }\n  throw new Error('Unreachable');\n}\n```\n\n### Step 2: Queue-Based Concurrency Control\n\n```typescript\nimport PQueue from 'p-queue';\n\n\u002F\u002F Limit to N concurrent transcription jobs\nconst transcriptionQueue = new PQueue({\n  concurrency: 5,           \u002F\u002F Max 5 concurrent jobs\n  interval: 60_000,         \u002F\u002F Per minute window\n  intervalCap: 50,           \u002F\u002F Max 50 new jobs per minute\n});\n\nasync function queuedTranscribe(audioUrl: string): Promise\u003CTranscript> {\n  return transcriptionQueue.add(() =>\n    transcribeWithBackoff(audioUrl)\n  );\n}\n\n\u002F\u002F Process a batch of files\nconst audioUrls = [\n  'https:\u002F\u002Fexample.com\u002Faudio1.mp3',\n  'https:\u002F\u002Fexample.com\u002Faudio2.mp3',\n  'https:\u002F\u002Fexample.com\u002Faudio3.mp3',\n];\n\nconst results = await Promise.all(\n  audioUrls.map(url => queuedTranscribe(url))\n);\n\nconsole.log(`Completed ${results.length} transcriptions`);\nconsole.log(`Queue size: ${transcriptionQueue.size}, pending: ${transcriptionQueue.pending}`);\n```\n\n### Step 3: Batch Processing with Progress\n\n```typescript\nasync function batchTranscribe(\n  audioUrls: string[],\n  onProgress?: (completed: number, total: number) => void\n): Promise\u003CTranscript[]> {\n  const queue = new PQueue({ concurrency: 5 });\n  const results: Transcript[] = [];\n  let completed = 0;\n\n  const promises = audioUrls.map(url =>\n    queue.add(async () => {\n      const transcript = await transcribeWithBackoff(url);\n      completed++;\n      onProgress?.(completed, audioUrls.length);\n      return transcript;\n    })\n  );\n\n  return Promise.all(promises);\n}\n\n\u002F\u002F Usage\nawait batchTranscribe(\n  urls,\n  (done, total) => console.log(`Progress: ${done}\u002F${total}`)\n);\n```\n\n### Step 4: Streaming Rate Limit Handling\n\n```typescript\nasync function connectStreamingWithRetry(maxRetries = 3) {\n  for (let attempt = 0; attempt \u003C= maxRetries; attempt++) {\n    try {\n      const transcriber = client.streaming.createService({\n        speech_model: 'nova-3',\n        sample_rate: 16000,\n      });\n\n      transcriber.on('error', (error) => {\n        console.error('Streaming error:', error);\n      });\n\n      await transcriber.connect();\n      return transcriber;\n    } catch (err: any) {\n      if (attempt === maxRetries) throw err;\n\n      \u002F\u002F WebSocket code 4008 = session limit\n      const delay = Math.pow(2, attempt) * 2000;\n      console.warn(`Stream connect failed. Retrying in ${delay}ms...`);\n      await new Promise(r => setTimeout(r, delay));\n    }\n  }\n}\n```\n\n## Output\n- Automatic retry with exponential backoff and jitter\n- Queue-based concurrency control with p-queue\n- Batch transcription with progress reporting\n- Streaming reconnection logic\n\n## Error Handling\n| Scenario | Status | Strategy |\n|----------|--------|----------|\n| Rate limited (async) | 429 | Exponential backoff, honor `Retry-After` header |\n| Server error | 500-503 | Retry with backoff |\n| Session limit (streaming) | WS 4008 | Wait and reconnect |\n| Auth error | 401 | Do not retry, fix credentials |\n| Invalid input | 400 | Do not retry, fix request |\n\n## Resources\n- [AssemblyAI Rate Limits](https:\u002F\u002Fwww.assemblyai.com\u002Fdocs\u002Fdeployment\u002Faccount-management)\n- [p-queue Documentation](https:\u002F\u002Fgithub.com\u002Fsindresorhus\u002Fp-queue)\n- [AssemblyAI Streaming Limits](https:\u002F\u002Fwww.assemblyai.com\u002Fdocs\u002Fstreaming)\n\n## Next Steps\nFor security configuration, see `assemblyai-security-basics`.\n\n","# AssemblyAI Rate Limits\n\n## Overview\nHandle AssemblyAI rate limits with exponential backoff, queue-based throttling, and concurrency management. AssemblyAI auto-scales limits for paid users.\n\n## Prerequisites\n- `assemblyai` package installed\n- Understanding of async\u002Fawait patterns\n\n## Rate Limit Tiers (Actual)\n\n### Async Transcription API\n| Endpoint | Free | Pay-as-you-go |\n|----------|------|---------------|\n| `POST \u002Fv2\u002Ftranscript` | 5\u002Fmin | Scales with usage |\n| `GET \u002Fv2\u002Ftranscript\u002F:id` | No hard limit | No hard limit |\n| `POST \u002Fv2\u002Fupload` | 5\u002Fmin | Scales with usage |\n\n### Streaming (WebSocket)\n| Metric | Free | Pay-as-you-go |\n|--------|------|---------------|\n| New streams\u002Fmin | 5 | 100 (auto-scales) |\n| Concurrent streams | ~5 | Unlimited (auto-scales 10% every 60s at 70% usage) |\n\n### LeMUR\n| Metric | Free | Paid |\n|--------|------|------|\n| Requests\u002Fmin | Limited | Scales with usage |\n| Max audio input | 100 hours per request | 100 hours per request |\n\n**Note:** AssemblyAI auto-scales paid limits. At 70%+ utilization, the new session rate limit increases by 10% every 60 seconds with no ceiling cap.\n\n## Instructions\n\n### Step 1: Exponential Backoff with Jitter\n\n```typescript\nimport { AssemblyAI, type Transcript } from 'assemblyai';\n\nconst client = new AssemblyAI({\n  apiKey: process.env.ASSEMBLYAI_API_KEY!,\n});\n\nasync function transcribeWithBackoff(\n  audioUrl: string,\n  options: Record\u003Cstring, any> = {},\n  config = { maxRetries: 5, baseDelayMs: 1000, maxDelayMs: 30000 }\n): Promise\u003CTranscript> {\n  for (let attempt = 0; attempt \u003C= config.maxRetries; attempt++) {\n    try {\n      return await client.transcripts.transcribe({\n        audio: audioUrl,\n        ...options,\n      });\n    } catch (err: any) {\n      if (attempt === config.maxRetries) throw err;\n\n      const status = err.status ?? err.statusCode;\n      \u002F\u002F Only retry on 429 (rate limit) and 5xx (server errors)\n      if (status && status !== 429 && (status \u003C 500 || status >= 600)) throw err;\n\n      const exponentialDelay = config.baseDelayMs * Math.pow(2, attempt);\n      const jitter = Math.random() * config.baseDelayMs;\n      const delay = Math.min(exponentialDelay + jitter, config.maxDelayMs);\n\n      console.warn(`[${attempt + 1}\u002F${config.maxRetries}] Retrying in ${delay.toFixed(0)}ms...`);\n      await new Promise(r => setTimeout(r, delay));\n    }\n  }\n  throw new Error('Unreachable');\n}\n```\n\n### Step 2: Queue-Based Concurrency Control\n\n```typescript\nimport PQueue from 'p-queue';\n\n\u002F\u002F Limit to N concurrent transcription jobs\nconst transcriptionQueue = new PQueue({\n  concurrency: 5,           \u002F\u002F Max 5 concurrent jobs\n  interval: 60_000,         \u002F\u002F Per minute window\n  intervalCap: 50,           \u002F\u002F Max 50 new jobs per minute\n});\n\nasync function queuedTranscribe(audioUrl: string): Promise\u003CTranscript> {\n  return transcriptionQueue.add(() =>\n    transcribeWithBackoff(audioUrl)\n  );\n}\n\n\u002F\u002F Process a batch of files\nconst audioUrls = [\n  'https:\u002F\u002Fexample.com\u002Faudio1.mp3',\n  'https:\u002F\u002Fexample.com\u002Faudio2.mp3',\n  'https:\u002F\u002Fexample.com\u002Faudio3.mp3',\n];\n\nconst results = await Promise.all(\n  audioUrls.map(url => queuedTranscribe(url))\n);\n\nconsole.log(`Completed ${results.length} transcriptions`);\nconsole.log(`Queue size: ${transcriptionQueue.size}, pending: ${transcriptionQueue.pending}`);\n```\n\n### Step 3: Batch Processing with Progress\n\n```typescript\nasync function batchTranscribe(\n  audioUrls: string[],\n  onProgress?: (completed: number, total: number) => void\n): Promise\u003CTranscript[]> {\n  const queue = new PQueue({ concurrency: 5 });\n  const results: Transcript[] = [];\n  let completed = 0;\n\n  const promises = audioUrls.map(url =>\n    queue.add(async () => {\n      const transcript = await transcribeWithBackoff(url);\n      completed++;\n      onProgress?.(completed, audioUrls.length);\n      return transcript;\n    })\n  );\n\n  return Promise.all(promises);\n}\n\n\u002F\u002F Usage\nawait batchTranscribe(\n  urls,\n  (done, total) => console.log(`Progress: ${done}\u002F${total}`)\n);\n```\n\n### Step 4: Streaming Rate Limit Handling\n\n```typescript\nasync function connectStreamingWithRetry(maxRetries = 3) {\n  for (let attempt = 0; attempt \u003C= maxRetries; attempt++) {\n    try {\n      const transcriber = client.streaming.createService({\n        speech_model: 'nova-3',\n        sample_rate: 16000,\n      });\n\n      transcriber.on('error', (error) => {\n        console.error('Streaming error:', error);\n      });\n\n      await transcriber.connect();\n      return transcriber;\n    } catch (err: any) {\n      if (attempt === maxRetries) throw err;\n\n      \u002F\u002F WebSocket code 4008 = session limit\n      const delay = Math.pow(2, attempt) * 2000;\n      console.warn(`Stream connect failed. Retrying in ${delay}ms...`);\n      await new Promise(r => setTimeout(r, delay));\n    }\n  }\n}\n```\n\n## Output\n- Automatic retry with exponential backoff and jitter\n- Queue-based concurrency control with p-queue\n- Batch transcription with progress reporting\n- Streaming reconnection logic\n\n## Error Handling\n| Scenario | Status | Strategy |\n|----------|--------|----------|\n| Rate limited (async) | 429 | Exponential backoff, honor `Retry-After` header |\n| Server error | 500-503 | Retry with backoff |\n| Session limit (streaming) | WS 4008 | Wait and reconnect |\n| Auth error | 401 | Do not retry, fix credentials |\n| Invalid input | 400 | Do not retry, fix request |\n\n## Resources\n- [AssemblyAI Rate Limits](https:\u002F\u002Fwww.assemblyai.com\u002Fdocs\u002Fdeployment\u002Faccount-management)\n- [p-queue Documentation](https:\u002F\u002Fgithub.com\u002Fsindresorhus\u002Fp-queue)\n- [AssemblyAI Streaming 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