We’ve been running Gemini TTS multi-speaker mode in production for our podcast SaaS platform for three weeks now and have documented seven reproducible issues. We’ve deployed 20+ workarounds on our end and logged 34 separate incidents. Sharing here in case others are hitting the same problems, and h…

We are having same exact issues on our project and trying to find a solution for this to go production release. ”Non-deterministic audio truncation” this one is really a critical bug, on our scenario we want to let users start listening generated content on the fly. So retrying does not work for ou…

We found a workaround for the truncation issue, and I’m sharing it here because Google Support certainly didn’t help us find it. The short version: switch from Vertex AI ( aiplatform.googleapis.com ) to the Developer API / Google AI Studio endpoint ( generativelanguage.googleapis.com ). Same model, sam…

Experiencing the same problem here. We hit the same finish-reason and truncation symptoms running gemini-3.1-flash-tts-preview for non-conversational audio tour generation (single speaker, no multi-speaker config). Spent the last week or so quantifying it across endpoints — sharing the data in case…

[image] [BUG] gemini-3.1-flash-tts-preview returns HTTP 200 with empty content and finishReason OTHER for Hebrew TTS prompt Gemini API I am calling gemini-3.1-flash-tts-preview for Hebrew TTS generation. The API returns HTTP 200 and reports generated AUDIO to…

Someone knows if google is working on fixing the model? Voice swap and strange sound was there in 2.5 too, they updated the model and this issues are even worse now.

Sorry for keeping y ou all wait. We are looking into this.

Gemini TTS Multi-Speaker Mode: 7 Critical Bugs After 3 Weeks in Production (finishReason 'OTHER', Truncation, Voice Swapping, Hallucinated Lines)

Gemini API

Soro May 11, 2026, 9:55am 5

did you solve it ?

Topic		Replies	Views
Gemini-3.1-flash-tts-preview: streamGenerateContent truncates audio + finishReason: OTHER past ~60s, while generateContent (non-streaming) works Gemini API audio	1	81	June 23, 2026
Gemini 3.1 Flash Live - Voice slowly changing, massive audio quality + volume dropping on TTS requests longer than ~1 minute Gemini API bug	2	414	June 11, 2026
Issues with gemini-tts-2.5-pro in AI Studio (blank audio, voice drift, pacing changes) Google AI Studio models , audio	1	236	May 31, 2026
Gemini 3.1 Flash TTS SSE sometimes returns exactly 20s / 1,280,000 base64 chars and truncated audio Gemini API api , gemini-api , gemini , gemini-flash	0	87	May 14, 2026
Gemini 2.5 Pro Preview TTS: Inconsistent Voice and Tone Output Google AI Studio audio , gemini-2-5	2	302	May 31, 2026

Gemini TTS Multi-Speaker Mode: 7 Critical Bugs After 3 Weeks in Production (finishReason 'OTHER', Truncation, Voice Swapping, Hallucinated Lines)

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