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Lightning V3.1 Pro (Jul 2026)
Smallest.ai's low-latency text-to-speech model family for real-time voice agents.
- Smallest.ai
- Closed
- Released 13 Jul 2026
Where it ranks
- BText to speechModels · Cloud · 1,170 on Artificial Analysis Speech Arena: Text to Speech (provider voices)
Facts
- Vendor
- Smallest.ai
- Family
- Lightning
- Released
- 13 Jul 2026
- Weights
- Closed: API and apps only
- License
- proprietary
- API price
- $20 per 1M characters (Artificial Analysis normalised price for Lightning V3.1 Pro.)
- Last verified
- 19 Oct 2026
Price from artificialanalysis.ai, 19 Oct 2026.
Benchmark results
| Benchmark | Result | Entry on the leaderboard | As of | Source |
|---|---|---|---|---|
| Artificial Analysis Speech Arena: Text to Speech (provider voices) | 1,170 | Lightning V3.1 Pro (Jul 2026)Provider Voice Arena, all categories and accents; rank 23 of 96, 2645 appearances; raw value from the page's embedded data; no last-updated date shown, so as_of = retrieval date. | 19 Oct 2026 | artificialanalysis.ai |
| TTS Arena V2 (Hugging Face Space) | 1,523 | Lightning v3.1 ProBradley-Terry rating ±28, 539 votes, board rank 9 (lower-bound sort); read from the arena's public JSON endpoint, which feeds https://huggingface.co/spaces/TTS-AGI/TTS-Arena-V2. | 19 Oct 2026 | tts-agi-tts-arena-v2.hf.space |
Where you can use it
No tracked tool lists this model yet.
Earlier versions
- Lightning v3.1 · 24 Mar 2026