docs: document OpenRouter TTS integration and response_format requirement - #1343
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Classic298 merged 1 commit intoAug 7, 2026
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…ment Closes open-webui/open-webui#28143 Adds a dedicated section to the OpenAI TTS Integration guide covering: - Configuring OpenRouter as a TTS provider via the OpenAI-compatible engine - The AUDIO_TTS_OPENAI_PARAMS env var for docker-compose setups - Why response_format must be set to mp3 (OpenRouter defaults to pcm, which Open WebUI cannot play back, causing a 400 Bad Request)
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What
Documents how to use OpenRouter as a Text-to-Speech provider through Open WebUI's OpenAI-compatible TTS engine, resolving the
400 Bad Requestreported in open-webui/open-webui#28143.Why
OpenRouter's
/audio/speechendpoint defaultsresponse_formattopcmwhen omitted, and Open WebUI's_tts_openaihandler (backend/open_webui/routers/audio.py) does not sendresponse_format. The result is raw PCM audio that Open WebUI cannot play back → HTTP 400.Changes
Adds a new "Using OpenRouter as a Text-to-Speech Provider" section to
openai-tts-integration.md:pcm)https://openrouter.ai/api/v1+{"response_format": "mp3"}in OpenAI ParamsAUDIO_TTS_OPENAI_PARAMS(verified againstconfig.pyL1589)mp3is playable in Open WebUI (pcmis for streaming pipelines)Testing
npx prettier --checkpasses on the modified fileaudio.tts.openai.paramsverified against thedevbranch sourceCloses #28143 (docs request)