Compare Lab
AssemblyAI vs Telnyx
AssemblyAI is positioned as transcription APIs for live and recorded audio, with model-specific language and analysis options. Telnyx is positioned as voice-agent infrastructure combining a carrier network with hosted speech and m
AssemblyAI is positioned as transcription APIs for live and recorded audio, with model-specific language and analysis options. Telnyx is positioned as voice-agent infrastructure combining a carrier network with hosted speech and model services. Start by deciding who owns the missing layers, then inspect the documented differences below.
STT and Full Platforms are different product categories. An underlying engine or framework is not a complete substitute for a deployed agent workflow.
16 jointly documented catalog fields. This measures evidence coverage, not equivalent quality or an overall winner.
Test opening hours, booking conflicts and an unanswered transfer.
Start where the records differ.
Values and evidence states are compared together. Shared facts follow the differences; Unknown never means No.
| Decision point | AssemblyAI | Telnyx |
|---|---|---|
| Billing unitDifferent records | Async audio hours; streaming connection hours; agent session minutes; gateway tokens | minute |
| Bring your telephonyDifferent records | Yes | Unknown |
| Bring your modelDifferent records | Yes | Unknown |
| Warm transferDifferent records | Unknown | Yes |
| HIPAA pathDifferent records | Yes | Yes |
| WebhooksDifferent records | YesUnknown | YesAPI / webhook |
Your requirements & next steps
Your requirements
Ready-made / AI receptionist · Strict evidence mode
No personal requirements yet. Add criteria in Advanced Filter to prioritize this comparison.
STT hours/session duration, agent minutes, gateway tokens and add-ons remain distinct.
Reviewed current public offer; retain original billing scope and units.
Model rates are scoped; add-ons stack; reference states updated May 29, 2026 and conflicts are retained.
Reviewed current public offer; retain original billing scope and units.
Idle streaming connection duration is billable. No fabricated all-in phone cost per minute.
Reviewed current public offer; retain original billing scope and units.
SSO costs $199 per connection per month; do not mistake no base fee for no fixed optional charges.
Reviewed current public offer; retain original billing scope and units.
Not a fixed monthly audio allowance; credits do not expire.
Reviewed current public offer; retain original billing scope and units.
No invented bundle overage.
Reviewed current public offer; retain original billing scope and units.
Component choices and call mix must be specified.
Reviewed current public offer; retain original billing scope and units.
Not yet researched against this buyer-critical field standard.
60-second call rounding, token usage and carrier destinations require more than aggregate minutes.
No complete phone bill ceiling from minutes alone; carrier, model and addon scope vary.
60-second call rounding, token usage and carrier destinations require more than aggregate minutes.
No complete phone bill ceiling from minutes alone; carrier, model and addon scope vary.
Research conclusion about cost completeness, not a vendor capability.
Anyone with this link can view the encoded decision criteria.
Vendor documentation establishes a claim. Public model benchmarks are separate context, not measurements of these platforms.
Open saved comparison ↗What to verify together.
AssemblyAI
A transcription hour is not a complete agent hour.
Universal-2 async / Universal-Streaming $0.15/hour; U3.5 Pro async $0.21/hour; U3 realtime $0.45/hour; Voice Agent $0.075/min · V3.3 evidence review · Voice Agent API reference; standalone STT is hourly; transport/add-ons separate
Excluded / confirm: Complete cost cannot be established from this reference. No complete phone bill ceiling from minutes alone; carrier, model and addon scope vary. · Twilio carrier; optional custom/Gateway LLM; standalone STT add-ons and per-channel billing
STT hours/session duration, agent minutes, gateway tokens and add-ons remain distinct.
Telnyx
The $0.05 voice engine is not a complete phone-call price.
$0.05/min Voice AI engine · V3.3 evidence review · Voice AI engine component; token, carrier, recording and number costs separate
Excluded / confirm: Complete cost cannot be established from this reference. 60-second call rounding, token usage and carrier destinations require more than aggregate minutes. · LLM token usage, carrier from $0.0032/min, recording/storage and number charges
Reviewed current public offer; retain original billing scope and units.
The evidence overlap.
Both records have documented values for Product type, Call direction, Technical setup, Pricing model, Published numeric pricing, Call recording, Realtime / streaming audio, AssemblyAI STT, OpenAI models, Anthropic models, Function / tool calling, Interruption controls and additional fields shown in Compare. Matching availability does not measure behavior under your call conditions.
Run the same booking, tool failure and unsuccessful human-transfer cases. Record both outcomes and billable units before signing a deployment agreement.
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