AssemblyAI vs Vapi — Pricing, Plans, and Verified Costs (2026)
AssemblyAI and Vapi both start at Free on their entry tier.
See price history: AssemblyAI · Vapi
How pricing works
These two tools don't price the same way, so the headline numbers below aren't directly comparable until you plug in your own volume.
- AssemblyAI (Per Usage) — AssemblyAI bills purely on usage. There is no fixed per-seat fee, so the monthly cost depends entirely on how much you consume.
- Vapi (Per Usage) — Vapi bills purely on usage — PAYG. There is no fixed per-seat fee, so the monthly cost depends entirely on how much you consume.
Per-minute, per-credit and per-token rates exclude any downstream model, speech or telephony costs unless the vendor states otherwise.
Speech AI platform for developers — long-form audio transcription, speaker diarization, and Universal-2 speech understanding models. Usage-based pricing: Best model at $0.37/hr audio, Nano tier at $0.12/hr. Pay-as-you-go with $50 free credit. Popular with podcast platforms, meeting recorders, and companies building on top of long-form audio.
Voice AI agent platform for developers building conversational voice apps. Base orchestration at $0.05/minute PAYG (STT/LLM/TTS/telephony billed separately, ~$0.07–0.25/min all-in). 10 concurrent lines included; extra lines $10/mo each. HIPAA add-on $2K/mo, ZDR $1K/mo. Enterprise starts $40K–70K/year. Backed by Bessemer and Y Combinator. Direct competitor to Retell AI and Bland AI.
All plans compared
| Tier role | Plan | AssemblyAI monthly | AssemblyAI annual | Vapi monthly | Vapi annual |
|---|---|---|---|---|---|
| Free / starter | Pay-as-you-go: Universal-2 (async) / PAYG | Free | Free | Free | Free |
| Enterprise | Enterprise | Custom | Custom | $3333 | $3333 |
Tier names differ across vendors. Rows are aligned by tier role, not name. Full tier structures on each tool's page.
What each is best for
AssemblyAI is worth it if… developers processing long-form audio at scale — podcasts, recorded meetings, call recordings. The per-hour pricing works out cheaper than Deepgram for batch transcription (as opposed to real-time streaming).
Vapi is worth it if… developers who want maximum control over the voice stack — swap any STT, LLM, TTS, or telephony provider without vendor lock-in. 05/min is the lowest orchestration fee in the category, but the real cost is what you stack on top.
Bottom line: Similar positioning, closer to a preference call than a strategic one.
Choose AssemblyAI over Vapi if…
Choose AssemblyAI if…
- You want to pay only for actual usage (per usage, a free entry tier).
- You match the profile AssemblyAI is built for: developers processing long-form audio at scale — podcasts, recorded meetings, call recordings.
- You need a general-purpose voice agents & speech/audio option rather than a vertical-specific one.
Choose Vapi if…
- You want a fully open voice stack — swap STT, LLM, TTS, or telephony providers freely.
- You're a developer prioritising maximum control over opinionated defaults.
- You need HIPAA or zero-data-retention compliance without switching platforms.
At a glance
| AssemblyAI | Vapi | |
|---|---|---|
| Free plan | Yes | Yes |
| Entry price | Free | Free |
| Enterprise available | Yes | Yes |
| Pricing model | Per Usage | Per Usage |
| Last verified | September 20, 2026 | September 10, 2026 |
| Full pricing | View full pricing | View full pricing |
Pricing last verified September 20, 2026. Tracked daily.