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Wider speed range for Flux TTS

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Flux TTS speed now runs from 0.5 to 1.5 in 0.05 increments, up from 0.85 – 1.15 . The default stays 1.0 , and every previously accepted value still works. The wider range applies everywhere speed is accepted on Flux TTS: the /v2/speak streaming WebSocket (at connection and mid-session with Configure ), the /v2/speak batch REST endpoint, and...

AI agentsStreamingDeveloper tools

Also shipped Aug 31, 2026Deepgram in August 2026 →

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New language

- Kazakh ( kk , kk-KZ ) , available for batch and streaming. Access this language by setting model="nova-3" and language="kk" in your request.

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Improved models

Batch and streaming models Polish ( pl ) Hebrew ( he ) Batch models Macedonian ( mk ) Streaming models Estonian ( et ) Latvian ( lv ) Lithuanian ( lt ) Malay ( ms ) You do not need to change your API requests to access the improvements to existing languages; the updates are live for all users.

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Flexible turn-taking control for Flux

Flux now gives you full control over how turns end. Beyond Flux's native end-of-turn detection, you can override it, suppress it entirely, or blend the two , and switch between these modes on the fly, even for a single turn, with a Configure message. Turn-taking goes from a fixed behavior to something you shape around each moment of a conversation.

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Three modes of turn-taking

- Automatic (default). Flux's native end-of-turn detection decides when a turn ends. EndOfTurn events carry "trigger": "model" . Nothing changes for existing integrations. Semi-manual. Keep Flux's detection running, but override it whenever you have a definitive signal , a push-to-talk release, a DTMF tone, a "send" tap , by sending a ForceEndTurn .

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Switch modes mid-stream , even per turn

Because eot_threshold can be updated live with a Configure message, you can change turn-taking behavior for exactly the turn that needs it and then change back. For example, when a caller is about to read an 8-character alphanumeric account ID, raise eot_threshold to 1.0 so Flux won't cut them off between characters, end the turn yourself once you've...

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What's new - Flux

ForceEndTurn message. Send {"type": "ForceEndTurn"} as a WebSocket text frame to end the active turn immediately. Flux ends the turn on the audio transcribed so far and emits a standard EndOfTurn . See Force End Turn . trigger field on EndOfTurn .

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What's new - Voice Agent

The Voice Agent API provides the same turn-taking control through the ForceEndTurn client message when the agent uses the Flux ( v2 ) listen provider. Send it to end the current user turn immediately, or set agent.listen.provider.eot_threshold=1.0 to fully suppress natural end-of-turn detection and drive every turn ending with ForceEndTurn .

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