Gemini 3.1 Flash TTS
Gemini 3.1 Flash TTS is Google DeepMind's text-to-speech model that generates expressive speech in 70+ languages, steered by 200+ audio tags plus free-form director's-note prompts (accent, pace, emotion, scene direction). Output is watermarked with SynthID.
Google launched the preview on April 15, 2026 across the Gemini API, AI Studio, Vertex AI, and Google Vids. It hit an Elo of 1,211 on the Artificial Analysis TTS leaderboard and is priced at $1/M text-input tokens and $20/M audio-output tokens — putting it in AA's "most attractive" quality-vs-cost quadrant and undercutting ElevenLabs' Flash/Turbo tier.
Simon Willison's hands-on walkthrough shows a character-profile prompt — 'Jaz is from Brixton, London' — producing a London accent, then swapping the line to 'Newcastle' or 'Exeter' visibly shifts the accent without any parameter change. The model supports multi-speaker dialogue natively, so one prompt renders a full two-voice scene.
Think of it as a voice actor you direct with stage notes — you describe the scene, the character, and the accent, and the model plays the part.
Search Interest
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Nascent ← now0–7 days
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Emergent8–30 days
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Validating31–90 days
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Rising91–180 days
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Established180 days +
Why is it emerging now?
Google DeepMind launched Gemini 3.1 Flash TTS in preview on April 15, 2026 with 70+ languages, 200+ audio tags, native multi-speaker dialogue, and an Elo of 1,211 on the Artificial Analysis leaderboard. Priced at $20/M audio-output tokens, it materially undercuts ElevenLabs' Flash tier while shipping directly into Vertex AI and Google Vids.
Outlook
6-month signal projection and commercial timeline.
Google's TTS pricing undercuts ElevenLabs Flash tier; distribution via Vertex AI + Google Vids bakes it into enterprise workflows fast.
Risk · Preview label + 16k-token output cap limits long-form use; OpenAI's next voice release could reset the benchmark in weeks.
Analogs · ElevenLabs Flash · OpenAI gpt-4o-audio-preview · Gemini 2.5 Flash
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nowAPI live, free tier included
Developers bill via Gemini API ($1/$20 per M tokens); Vertex AI SKU live for enterprise.
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3-6moVoice-app gold rush
Expect an ElevenLabs-style wave of indie voice apps riding the $20/M audio price point.
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6-12moGA + commercial voice clones
Post-preview GA likely; watermark-aware voice-cloning and podcast-style dialogue tools emerge.
Competition & Opportunity for term “Gemini 3.1 Flash TTS”
Three heuristic signals derived from the tracked queries, the term's monetization cards, and its cluster neighbors. Directional, not audited.
Ideas for term “Gemini 3.1 Flash TTS”
Buildable pitches — turn this term into an article, site, product, post, newsletter, video, or course. Steal any card and run with it.
Every developer choosing a TTS in April 2026 needs this comparison. Google's $20/M audio-token pricing, ElevenLabs' $0.06-0.30/1k characters, and the Elo gap are all public but no single article puts them together.
Audio tags are the model's differentiator but Google's docs list them across multiple pages. A consolidated cheatsheet with example outputs is evergreen and highly shareable.
Native multi-speaker support is the killer feature for AI-podcast creators. No end-to-end tutorial exists yet for script → dialogue → export to RSS.
Every Gemini 3.1 Flash TTS output is SynthID-watermarked. Creators, platforms, and moderation teams all need to know how detection works and where it fails.
The Willison 'Brixton vs Newcastle' demo points to a real use case: a tool that lets indie audiobook authors assign regional accents per character via the director's-note prompt.
70+ languages with localized expressiveness + $20/M audio pricing = course creators can produce every language for pennies. The segment currently pays ElevenLabs $99+/month.
Platforms hosting user-generated audio need to detect SynthID-watermarked speech at scale. An open SDK + managed API rides the regulatory tailwind.
Side-by-side demo with audio samples, emotion control, cost breakdown. The exact piece the 'best AI voice 2026' searcher is looking for.
$20 per million audio-output tokens. For a 10-minute podcast episode, that's under two cents. ElevenLabs' cheapest tier charges 30x more.
The prompt 'Jaz is from Brixton, London' produced a real Brixton accent. The same line with 'Newcastle' produced a real Geordie lilt. No parameter. No pretraining bias to blame.
For three years, ElevenLabs owned AI voice. In a single Tuesday afternoon, Google shipped a competitor that's cheaper, more controllable, and baked into every Google Workspace.
What People Search
Long-tail queries from Google Suggest + Trends. Volume and competition are heuristics — directional, not audited. Content Type comes from query shape.
SERP of term “Gemini 3.1 Flash TTS”
What searchers see today — organic results on top, paid ads if anyone's bidding. Ad density is a real-time commercial signal.
Related Terms
Other terms in the same space — aliases, subtypes, competitors, and neighbors to explore next.
- Part of Gemini 3.1 Flash Gemini 3.1 Flash is Google's mid-2026 speed-tier refresh of the Gemini model family — a family-of-variants brand rather than a single model. →
- Related Claude Opus 4.7 Claude Opus 4.7 is Anthropic's flagship LLM, released April 16, 2026. →
- Part of Gemini API
- Competitor ElevenLabs Flash·gpt-4o-audio-preview
- Related Gemini 3.1 Flash Lite·Gemini 3.1 Flash Image·SynthID·audio tags·voice cloning
Sources
Primary URLs this report cites — open any to verify the claim yourself.
- 01 Google Blog — Gemini 3.1 Flash TTS launch blog.google ↗
- 02 Gemini API docs — 3.1 Flash TTS preview ai.google.dev ↗
- 03 Google Cloud — Vertex AI launch post cloud.google.com ↗
- 04 Simon Willison — hands-on with directed prompts simonwillison.net ↗
- 05 DeepMind model card — Gemini 3.1 Flash Audio deepmind.google ↗
- 06 Artificial Analysis — TTS leaderboard entry artificialanalysis.ai ↗
- 07 MarkTechPost coverage marktechpost.com ↗