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Tier 1: 500 RPM; Tier 2: 2,500 RPM; Tier 3: 5,000 RPM; Tier 4: 7,500 RPM; Tier 5: 10,000 RPM. gpt-4o-mini-tts: Tier 1 500 RPM / 50,000 TPM; Tier 5 10,000 RPM / 8,000,000 TPM.", "known_restrictions": [ "Maximum input length: 4096 characters per request (tts-1/tts-1-hd); 2,000 tokens for gpt-4o-mini-tts", "Custom voices limited to up to 20 per organization; requires eligibility and sales contact", "Custom voice audio samples must be 30 seconds or less", "Instructions parameter (voice control) not available on tts-1 or tts-1-hd; only gpt-4o-mini-tts", "SSE stream_format not available for tts-1/tts-1-hd", "Usage policies require clear disclosure to end users that TTS voice is AI-generated", "Custom voice consent phrases required in specific languages", "SSML not supported", "Speed parameter range: 0.25 to 4.0" ] }, "developer": { "docs_url": "https://developers.openai.com/api/docs", "api_reference_url": "https://platform.openai.com/api/reference/overview", "openapi_spec_url": null, "postman_collection_url": null, "changelog_url": null, "status_page_url": null, "llms_txt_url": null, "markdown_docs_url": "https://platform.openai.com/docs/guides/text-to-speech.md", "rendering": "static" }, "adoption": { "launched_at": "2023-11-06", "ga_date": "2023-11-06", "github_stars": null, "github_stars_at": null, "notable_customers": [] }, "scores": { "agent_friendliness": 30, "pricing_transparency": 85, "setup_speed": 60, "docs_quality": 50, "procurement_friction": 85, "trust_readiness": 100, "best_for": [ "Regulated or enterprise workloads - compliance attestations and an enterprise plan", "Cost-sensitive teams - low, transparent entry price" ], "avoid_if": [ "You want to try it free before paying" ] }, "sources": [ { "field": "hipaa", "url": "https://openai.com/api/", "excerpt": "Business Associate Agreements for HIPAA compliance available for eligible customers.", "confidence": "high" }, { "field": "supported_actions", "url": "https://developers.openai.com/api/docs/guides/text-to-speech", "excerpt": "The gpt-4o-mini-tts model accepts instructions to control accent, emotional range, intonation, impressions, speech speed, tone, and whispering.", "confidence": "high" }, { "field": "webhooks_supported", "url": "https://developers.openai.com/api/docs/guides/text-to-speech", "excerpt": "The TTS API is a request-based API that generates audio directly in response to API calls; no webhook mechanism is used for standard TTS endpoints.", "confidence": "high" }, { "field": "output_types", "url": "https://developers.openai.com/api/reference/resources/audio/subresources/speech/methods/create", "excerpt": "response_format: mp3, opus, aac, flac, wav, pcm", "confidence": "high" }, { "field": "pricing_model", "url": "https://developers.openai.com/api/docs/models/gpt-4o-mini-tts", "excerpt": "Input: $0.60 per 1M text tokens; Output: $12.00 per 1M audio tokens", "confidence": "high" }, { "field": "has_published_pricing", "url": "https://developers.openai.com/api/docs/models/tts-1-hd", "excerpt": "$30.00 per 1 million characters", "confidence": "high" }, { "field": "soc2", "url": "https://trust.openai.com", "excerpt": "SOC 2 Type 2 (covering Security, Availability, Confidentiality, and Privacy). SOC 2 Type 2 report available for period Jan 1 - Jun 30, 2025.", "confidence": "high" }, { "field": "pci_dss", "url": "https://trust.openai.com", "excerpt": "PCI DSS v4.0.1 (for payment processing components)", "confidence": "medium" }, { "field": "hipaa", "url": "https://help.openai.com/en/articles/8660679-how-can-i-get-a-business-associate-agreement-baa-with-openai-for-the-api-services", "excerpt": "OpenAI is able to sign Business Associate Agreements (BAA) in support of customers' compliance with HIPAA. Most API services are covered by the BAA.", "confidence": "high" }, { "field": "sla_published", "url": "https://openai.com/api-scale-tier/", "excerpt": "Scale Tier traffic offers a 99.9% uptime SLA and prioritized compute.", "confidence": "medium" }, { "field": "documented_rate_limits", "url": "https://developers.openai.com/api/docs/models/gpt-4o-mini-tts", "excerpt": "Tier 1: 500 RPM / 50,000 TPM; Tier 5: 10,000 RPM / 8,000,000 TPM", "confidence": "high" }, { "field": "vendor_description", "url": "https://developers.openai.com/api/docs/guides/text-to-speech", "excerpt": "Transform text into lifelike spoken audio — OpenAI's TTS service enabling blog narration, multilingual audio production, and realtime voice output.", "confidence": "high" }, { "field": "supported_actions", "url": "https://developers.openai.com/api/docs/guides/text-to-speech", "excerpt": "Organizations can create up to 20 custom voices from audio samples (≤30 seconds), though this requires special eligibility.", "confidence": "high" }, { "field": "supported_languages", "url": "https://developers.openai.com/api/docs/guides/text-to-speech", "excerpt": "The API generally follows the Whisper model in terms of language support. Includes: Afrikaans, Arabic, Armenian, Azerbaijani, Belarusian, Bosnian, Bulgarian, Catalan, Chinese, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, Galician, German, Greek, Hebrew, Hindi, Hungarian, Icelandic, Indonesian, Italian, Japanese, Kannada, Kazakh, Korean, Latvian, Lithuanian, Macedonian, Malay, Marathi, Maori, Nepali, Norwegian, Persian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swahili, Swedish, Tagalog, Tamil, Thai, Turkish, Ukrainian, Urdu, Vietnamese, Welsh.", "confidence": "high" }, { "field": "pricing_model", "url": "https://developers.openai.com/api/docs/models/tts-1", "excerpt": "$15.00 per 1M characters for speech generation", "confidence": "high" }, { "field": "has_published_pricing", "url": "https://developers.openai.com/api/docs/models/tts-1", "excerpt": "$15.00 per 1M characters", "confidence": "high" }, { "field": "free_tier_available", "url": "https://developers.openai.com/api/docs/models/tts-1", "excerpt": "Free tier: 3 RPM, 200 RPD — this is a rate-limit tier, not a recurring free-character allowance", "confidence": "high" }, { "field": "iso_27001", "url": "https://trust.openai.com", "excerpt": "ISO/IEC 27001:2022 — certificate documents operation of an Information Security Management System that conforms to ISO/IEC 27001:2022 for OpenAI's API, ChatGPT Enterprise, and ChatGPT Edu services.", "confidence": "high" }, { "field": "gdpr", "url": "https://trust.openai.com", "excerpt": "GDPR compliance", "confidence": "high" }, { "field": "documented_rate_limits", "url": "https://developers.openai.com/api/docs/models/tts-1", "excerpt": "Rate Limits by Tier: Free: 3 RPM, Tier 1: 500 RPM, Tier 2: 2,500 RPM, Tier 3: 5,000 RPM, Tier 4: 7,500 RPM, Tier 5: 10,000 RPM", "confidence": "high" }, { "field": "sdk_languages", "url": "https://developers.openai.com/api/docs/libraries", "excerpt": "Official SDKs: JavaScript/TypeScript (npm), Python (pip), C#/.NET (NuGet, in collaboration with Microsoft), Java (Maven, beta), Go (beta), Ruby (gem)", "confidence": "high" }, { "field": "known_restrictions", "url": "https://developers.openai.com/api/reference/resources/audio/subresources/speech/methods/create", "excerpt": "The maximum length is 4096 characters for the input text parameter.", "confidence": "high" }, { "field": "auth_methods", "url": "https://developers.openai.com/api/reference/overview", "excerpt": "The OpenAI API accepts bearer credentials from API keys or from short-lived access tokens created with workload identity federation", "confidence": "high" }, { "field": "base_url", "url": "https://developers.openai.com/api/docs/guides/text-to-speech", "excerpt": "Base URL: https://api.openai.com/v1", "confidence": "high" }, { "field": "api_version", "url": "https://developers.openai.com/api/reference/overview", "excerpt": "API Version Header: openai-version: 2020-10-01", "confidence": "high" }, { "field": "stability", "url": "https://developers.openai.com/api/docs/models/tts-1", "excerpt": "The model is optimized for realtime text-to-speech use cases ... no indication of deprecated status", "confidence": "high" }, { "field": "sdk_packages", "url": "https://developers.openai.com/api/docs/libraries", "excerpt": "JavaScript/TypeScript: openai (npm) openai-node; Python: openai (pip) openai-python; Java: openai-java; Go: openai-go; Ruby: openai", "confidence": "high" }, { "field": "sdk_packages", "url": "https://github.com/openai/openai-node", "excerpt": null, "confidence": "high" }, { "field": "quickstart_url", "url": "https://developers.openai.com/api/docs/guides/text-to-speech", "excerpt": "Authentication Method: Bearer token via Authorization header with $OPENAI_API_KEY ... 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Half the cost of TTS-1 HD ($30/1M characters)", "confidence": "high" }, { "field": "ga_date", "url": "https://developers.openai.com/api/docs/changelog", "excerpt": "Released GPT-4 Turbo Preview, updated GPT-3.5 Turbo, GPT-4 Turbo with Vision, Assistants API, DALL·E 3 in the API, and text-to-speech API (November 6, 2023)", "confidence": "high" }, { "field": "mcp_server_available", "url": "https://developers.openai.com/api/docs/docs-mcp", "excerpt": "The MCP server provides read-only access to OpenAI developer documentation (search + page content) — not a TTS action server.", "confidence": "high" }, { "field": "known_restrictions", "url": "https://developers.openai.com/api/docs/guides/text-to-speech", "excerpt": "Usage policies require clear disclosure to end users that the TTS voice they are hearing is AI-generated and not a human voice.", "confidence": "high" }, { "field": "auth_docs_url", "url": "https://developers.openai.com/api/reference/overview", "excerpt": "Primary reference: https://platform.openai.com/api/reference/overview#authentication", "confidence": "high" }, { "field": "base_url", "url": "https://developers.openai.com/api/reference/overview", "excerpt": "Base URL: https://api.openai.com/v1/", "confidence": "high" }, { "field": "versioning_scheme", "url": "https://developers.openai.com/api/docs/guides/text-to-speech", "excerpt": "Base URL: https://api.openai.com/v1 ... 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