Side by side
AssemblyAI-TTS-1 and MAI-Voice-2.1-Flash, 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 | MAI-Voice-2.1-Flash |
|---|---|---|
| Price | ||
| Price per character | $0.000015 | $0.000015 |
| Independent benchmarks | ||
| Artificial Analysis Speech Arena | 1221 Elo (#6 of 13) | Not measured |
| Specs | ||
| Provider | AssemblyAI | Microsoft AI |
| Release date | October 28, 2026 | October 1, 2026 |
| Access | API only | API only |
| Context window | Not reported | Not reported |
| Max output | Not reported | Not reported |
| Input | text | text |
| Output | audio | audio |
No independent benchmark has scored both models yet. Each rank counts the current models scored on that benchmark.
Charts
Against every current audio model
Where AssemblyAI-TTS-1 and MAI-Voice-2.1-Flash land among the current models of their task, on every independent benchmark, on price and on context.
Where each stands
Only AssemblyAI-TTS-1 has a current Artificial Analysis Speech Arena score: #6 of 13. Each bar is the share of current models it beats.
Independent benchmarks
Artificial Analysis Speech Arena
AssemblyAI-TTS-1:#6of 13
1,221 Elo · ahead of 58%
MAI-Voice-2.1-Flash: Not scored
Price and context
Price per character
AssemblyAI-TTS-1:#2of 11
$0.000015 · cheaper than 70%
MAI-Voice-2.1-Flash:#2of 11
$0.000015 · cheaper than 70%
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
- MAI-Voice-2.1-Flash
- $15
| Workload or rate | AssemblyAI-TTS-1 | MAI-Voice-2.1-Flash |
|---|---|---|
| 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
Verdict
When to choose each
AssemblyAI-TTS-1
Where it leads
No measured lead over MAI-Voice-2.1-Flash in this data.
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
MAI-Voice-2.1-Flash
Where it leads
No measured lead over AssemblyAI-TTS-1 in this data.
Best for
- Voice agents and call-center assistants
- High-volume, low-latency speech
Watch out for
- Microsoft Foundry lists it as a preview, and voice cloning needs Microsoft approval
- Microsoft's claims of 55% faster inference and about 60% lower cost do not name the models compared
From benchmark to production
Building on AssemblyAI-TTS-1 or MAI-Voice-2.1-Flash?
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
FAQ
AssemblyAI-TTS-1 vs MAI-Voice-2.1-Flash FAQ
Which is cheaper, AssemblyAI-TTS-1 or MAI-Voice-2.1-Flash?
Both cost $0.000015 per character.
How much would 1M characters cost with AssemblyAI-TTS-1 or MAI-Voice-2.1-Flash?
1M characters comes to $15 with AssemblyAI-TTS-1 and $15 with MAI-Voice-2.1-Flash at their listed rates.
Further reading
More on AssemblyAI-TTS-1 and MAI-Voice-2.1-Flash
Related comparisons
- AssemblyAI-TTS-1 vs Eleven Flash v2.5
- MAI-Voice-2.1-Flash vs Voxtral Mini TTS 3
- AssemblyAI-TTS-1 vs Eleven v4 Turbo
- Eleven Flash v2.5 vs MAI-Voice-2.1-Flash
- AssemblyAI-TTS-1 vs Sonic 3.6
- Eleven v4 Turbo vs MAI-Voice-2.1-Flash
- AssemblyAI-TTS-1 vs TTS-1
- MAI-Voice-2.1-Flash vs TTS-1
- AssemblyAI-TTS-1 vs Voxtral Mini TTS 3
- MAI-Voice-2.1 vs MAI-Voice-2.1-Flash
- AssemblyAI-TTS-1 vs MAI-Voice-2.1
Production evaluation
Choosing between AssemblyAI-TTS-1 and MAI-Voice-2.1-Flash?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty