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openai-audio

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Produce and understand audio with OpenAI request-based audio APIs and audio-capable chat models, including text-to-speech, transcription, translation, multimodal audio input/output, model routing, prompt and performance direction, artifact custody, approval gates, and safety/rights review. Use for non-realtime OpenAI audio production; route continuous live voice agents to the separate realtime voice skill.

skills/providers/speech-and-voice/openai-audio/SKILL.md

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# OpenAI audio

Use this skill when a user wants OpenAI audio production or understanding in a bounded request: generated narration, spoken product demos, podcast or interview transcription, subtitle timing, translation to English, audio QA, or adding audio input/output to an existing chat workflow.

Do not use this as the primary guide for continuous low-latency speech-to-speech agents, live interpreting, SIP/WebRTC sessions, or voice activity detection. Those belong to the separate realtime voice skill. This skill may still explain the boundary: request-based audio APIs fit files, scripts, and bounded requests; realtime sessions fit open connections with live audio events. Documented source: OpenAI’s audio guide distinguishes request-based APIs, realtime sessions, and multimodal chat completions; verified 2026-07-10: https://developers.openai.com/api/docs/guides/audio

## Source status and evidence labels

Treat the following as documented facts verified on 2026-07-10 from OpenAI public docs:

- The request-based speech endpoint is `POST /v1/audio/speech`; it accepts `gpt-4o-mini-tts`, the current pinned snapshot `gpt-4o-mini-tts-2025-12-15`, `tts-1`, and `tts-1-hd`, and supports built-in voices plus custom voice IDs where available. Speech input is limited to 4,096 characters. The older pinned snapshot `gpt-4o-mini-tts-2025-03-20` is scheduled to shut down on 2026-07-23 with `gpt-4o-mini-tts-2025-12-15` as its documented substitute; do not confuse that snapshot retirement with retirement of the unpinned alias. Sources: https://developers.openai.com/api/reference/resources/audio/subresources/speech/methods/create and https://developers.openai.com/api/docs/deprecations
- `gpt-4o-mini-tts` supports instruction-style voice control; the older `tts-1` and `tts-1-hd` models do not support the `instructions` parameter. Source: https://developers.openai.com/api/reference/resources/audio/subresources/speech/methods/create
- Speech output formats for `/v1/audio/speech` are documented as `mp3`, `opus`, `aac`, `flac`, `wav`, and `pcm`; `speed` ranges from `0.25` to `4.0`; streaming format can be `sse` or `audio`, with SSE not supported for `tts-1`/`tts-1-hd`. Source: https://developers.openai.com/api/reference/resources/audio/subresources/speech/methods/create
- The speech-to-text endpoint is `POST /v1/audio/transcriptions`; documented models include `gpt-4o-transcribe`, `gpt-4o-mini-transcribe`, `gpt-4o-transcribe-diarize`, and `whisper-1`, with response-format and streaming differences by model. File uploads are limited to 25 MB; split or compress larger inputs without cutting mid-sentence. Source: https://developers.openai.com/api/docs/guides/speech-to-text
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