Humanness Index™ · TTS model

Speechify Simba 3.2

Simba 3.2 is Speechify's streaming native flagship, released to the SpeechifyAI API in July 2026 as the recommended model for new English integrations.

Rank: #7
Humanness: 83
Likely rank: #1–16
Blind votes: 90

Standings as of Jul 27, 2026, 22:55 UTC

A real arena clip: a cloned source voice reading a customer support prompt at phone quality.

Simba 3.2 key stats

Latency (measured): —Not measured: no publicly reachable API at benchmark time. The Index never shows vendor latency estimates.
Languages: English¹
Price / 1M chars: $10²
Voice cloning: zero-shot, manual approval³
Released: July 8, 2026⁴

docs.speechify.ai/build/guides/concepts/models (checked 2026-07-23) English only at launch; Speechify says multilingual support will land under the same model id.
speechify.ai/text-to-speech-api (checked 2026-07-23) Flat per-character rate by plan: $10 per 1M characters on Starter, $8 on Pro, $6 on Scale; no credit conversion.
docs.speechify.ai/build/guides/concepts/models (checked 2026-07-23) Cloned voices are supported on simba-3.2, but each voice key currently requires manual Speechify approval.
docs.speechify.ai/build/changelog/2026/7/8 (checked 2026-07-23) API availability of simba-3.2 on the speech and stream endpoints.

Background

Simba 3.2 is Speechify's streaming native flagship, released to the SpeechifyAI API in July 2026 as the recommended model for new English integrations. Speechify positions it on expressivity and time to first byte, and it debuted statistically tied for first place on the Artificial Analysis TTS leaderboard. It serves a curated voice allow list, with cloned voices supported behind a manual approval step.

Sources: docs.speechify.ai, speechify.ai

At a glance

The arena clips for Simba 3.2 were rendered by Speechify with the four licensed source voices cloned on its platform, then verified and hosted by the Index team under the same frozen content hash scheme as every other model, the same vendor supplied path used where the pipeline has no API access. Latency shows a dash because the 50 trial streaming benchmark has not run against a Speechify key yet; we never substitute vendor figures.

Sources: docs.speechify.ai

Position in the rankings

Standings as of Jul 27, 2026, 22:55 UTC

Rank	Provider	Model	Humanness	Latency
#5	MiniMax	Speech 2 HD	89	357 ms
#6	xAI	Grok TTS (Streaming)	86	285 ms
#7	Speechify	Simba 3.2	83	—
#8	Inworld	TTS-1.5-max	78	337 ms
#9	ElevenLabs	Flash v2	76	226 ms

See the full Humanness Index™ rankings

Frequently asked questions

How is Simba 3.2 tested on the Humanness Index™?: Listeners hear Simba 3.2 against another model in a blind head to head round, both voices reading the same customer support prompt from the same cloned source voice, and they pick whichever sounds more human. Its Humanness score derives purely from those votes.
Where did the Simba 3.2 arena clips come from?: Speechify rendered the 80 arena clips (four cloned source voices reading the 20 frozen prompts) with simba-3.2 and supplied them to the Index team, who normalized, verified, and hosted them under the frozen content hash scheme. Blind battles and scoring work exactly as for every other model.

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Simba 3.2 key stats

Latency (measured)

—Not measured: no publicly reachable API at benchmark time. The Index never shows vendor latency estimates.

Languages

English¹

Price / 1M chars

$10²

Voice cloning

zero-shot, manual approval³

Released

July 8, 2026⁴

docs.speechify.ai/build/guides/concepts/models (checked 2026-07-23) English only at launch; Speechify says multilingual support will land under the same model id.

speechify.ai/text-to-speech-api (checked 2026-07-23) Flat per-character rate by plan: $10 per 1M characters on Starter, $8 on Pro, $6 on Scale; no credit conversion.

docs.speechify.ai/build/guides/concepts/models (checked 2026-07-23) Cloned voices are supported on simba-3.2, but each voice key currently requires manual Speechify approval.

docs.speechify.ai/build/changelog/2026/7/8 (checked 2026-07-23) API availability of simba-3.2 on the speech and stream endpoints.

Background

At a glance

Rank

Provider

Model

Humanness

Latency

MiniMax

Speech 2 HD

357 ms

xAI

Grok TTS (Streaming)

285 ms

Speechify

Simba 3.2

—

Inworld

TTS-1.5-max

337 ms

ElevenLabs

Flash v2

226 ms

Frequently asked questions

How is Simba 3.2 tested on the Humanness Index™?

Listeners hear Simba 3.2 against another model in a blind head to head round, both voices reading the same customer support prompt from the same cloned source voice, and they pick whichever sounds more human. Its Humanness score derives purely from those votes.

Where did the Simba 3.2 arena clips come from?

Speechify rendered the 80 arena clips (four cloned source voices reading the 20 frozen prompts) with simba-3.2 and supplied them to the Index team, who normalized, verified, and hosted them under the frozen content hash scheme. Blind battles and scoring work exactly as for every other model.