audio model comparison

AssemblyAI-TTS-1 vs TTS-1

AssemblyAI-TTS-1 and TTS-1 are both current audio models, from AssemblyAI and OpenAI. Both cost $0.000015 per character. On Artificial Analysis Speech Arena, AssemblyAI-TTS-1 scores 1221 Elo and TTS-1 1086 Elo (Artificial Analysis, measured November 3, 2026).

Data verified November 3, 2026 · Dataset 2026-11-03

AssemblyAI-TTS-1 and TTS-1, line by line

Prices in effect today, compared at the same tier wherever both list one. The better value in each row is highlighted.

Fact	AssemblyAI-TTS-1	TTS-1
Price
Price per character	$0.000015	$0.000015
Independent benchmarks
Artificial Analysis Speech Arena	1221 Elo (#6 of 13) (better)	1086 Elo (#11 of 13)
Specs
Provider	AssemblyAI	OpenAI
Release date	October 28, 2026	Not reported
Access	API only	API only
Context window	Not reported	Not reported
Max output	Not reported	Not reported
Input	text	text
Output	audio	audio

Scores:Artificial Analysis · 2026-11-03

Open both in the interactive comparison

Charts

Against every current audio model

Where AssemblyAI-TTS-1 and TTS-1 land among the current models of their task, on every independent benchmark, on price and on context.

Where each stands

On Artificial Analysis Speech Arena, AssemblyAI-TTS-1 ranks #6 and TTS-1 #11 of 13 current models. Each bar is the share of current models it beats: on score, price and context.

Independent benchmarks

Artificial Analysis Speech Arena

AssemblyAI-TTS-1:#6of 13

1,221 Elo · ahead of 58%

TTS-1:#11of 13

1,086 Elo · ahead of 17%

Price and context

Price per character

AssemblyAI-TTS-1:#2of 11

$0.000015 · cheaper than 70%

TTS-1:#2of 11

$0.000015 · cheaper than 70%

Scores fromArtificial Analysis · 2026-11-03

Cost

What each costs

Example workloads at each provider's listed rates, then every other rate either one lists. The cheaper figure in each row is highlighted.

The same work, priced

At each provider's listed rates.

1M characters
The same price
AssemblyAI-TTS-1
$15
TTS-1
$15

Workload or rate	AssemblyAI-TTS-1	TTS-1
Example workloads
1M characters	$15	$15

Your own bill will differ. These figures use list prices and example workloads. The AI Model Cost Audit reviews your real usage, shortlists models that score as well for each task for less, and estimates the savings.

Launch price $100, regular price $150

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Verdict

When to choose each

AssemblyAI-TTS-1

Where it leads

Higher Artificial Analysis Speech Arena score, 1221 Elo vs 1086 Elo

Best for

Voice agents on live phone calls
High-volume speech where the cost per character matters

Watch out for

Six languages at launch; AssemblyAI says more languages and accents will follow
No fine-tuned (Pro) voice cloning, pronunciation dictionaries or emotion tags at launch
The head-to-head figures in the launch post are AssemblyAI tests

Full AssemblyAI-TTS-1 profile

TTS-1

Where it leads

No measured lead over AssemblyAI-TTS-1 in this data.

Best for

Low-latency text-to-speech

Watch out for

OpenAI no longer lists TTS-1 on its models overview, though its model page and $15 per 1M characters price remain

Full TTS-1 profile

From benchmark to production

Building on AssemblyAI-TTS-1 or TTS-1?

Public scores rarely hold on your own data. We test both models on your real tasks, then build the agent or pipeline around the one that wins.

AI Model Cost AuditLaunch price $100, regular price $150What the audit includes

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