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OpenAI Realtime API vs Pipecat
OpenAI Realtime API is positioned as speech-to-speech API for developers implementing their own voice application. Pipecat is positioned as open-source Python orchestration for a voice stack assembled by developers. Start by decid
OpenAI Realtime API is positioned as speech-to-speech API for developers implementing their own voice application. Pipecat is positioned as open-source Python orchestration for a voice stack assembled by developers. Start by deciding who owns the missing layers, then inspect the documented differences below.
13 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 | OpenAI Realtime API | Pipecat |
|---|---|---|
| Billing unitDifferent records | 1 million text/audio/image tokens; transcription separately metered | Active/reserved agent minute; participant minute; telephony minute; SIP REFER event |
| Bring your modelDifferent records | Unknown | Yes |
| Warm transferDifferent records | Unknown | Yes |
| HIPAA pathDifferent records | Unknown | Yes |
| Billing modelShared state | component-stack | component-stack |
| Bring your telephonyShared state | Yes | Yes |
Your requirements & next steps
Your requirements
Ready-made / AI receptionist · Strict evidence mode
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Realtime model tokens plus input transcription, tools and carrier/hosting; not GPT-Live session-minute billing.
Framework open source; Cloud compute, reservation, transport, recording and providers separately priced.
Cached audio/text and image inputs have separate rates. Rate is not per-minute.
Compute only. Transport/models/recording and reserved idle time excluded.
Model scope fixed to GPT-Realtime-2, not all voice models.
Different units cannot be normalized without usage and provider assumptions.
Published Realtime token rates do not establish these account/contract terms. GPT-Live duration billing and unrelated fine-tuning discounts must not be imported.
Public component table and Enterprise sales path were reviewed; an exact platform subscription floor, contractual minimum and billing-rounding policy were not established. Per-minute display alone does not prove per-second metering.
Published Realtime token rates do not establish these account/contract terms. GPT-Live duration billing and unrelated fine-tuning discounts must not be imported.
Does not make hosting or model inference free.
Published Realtime token rates do not establish these account/contract terms. GPT-Live duration billing and unrelated fine-tuning discounts must not be imported.
This is the audio-filter allowance overage, not an all-in call rate.
Repeated context, cache behavior and turn count affect token charges.
Enterprise integrated inference billing by agreement.
Not yet researched against this buyer-critical field standard.
Not yet researched against this buyer-critical field standard.
Full bill requires measured model/token/cache/tool/carrier usage; conversation minutes alone are insufficient.
No all-in ceiling from minutes alone: reservation, transport, providers, recording and carrier legs vary.
Full bill requires measured model/token/cache/tool/carrier usage; conversation minutes alone are insufficient.
No all-in ceiling from minutes alone: reservation, transport, providers, recording and carrier legs vary.
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.
OpenAI Realtime API
A token rate cannot be compared directly with a bundled call-minute price.
GPT-Realtime-2 audio input $32/M, audio output $64/M; text input $4/M, output $24/M · V3.3 evidence review · GPT-Realtime-2 input audio tokens only; output/audio/text/cache have different rates; not 2.1 rate evidence
Excluded / confirm: Complete cost cannot be established from this reference. Full bill requires measured model/token/cache/tool/carrier usage; conversation minutes alone are insufficient. · Input transcription, tool/backend calls, carrier and application infrastructure
Realtime model tokens plus input transcription, tools and carrier/hosting; not GPT-Live session-minute billing.
Pipecat
Free framework licensing does not cover inference, hosting or carriers.
agent-1x active $0.01/min, reserved $0.0005/min; agent-2x $0.02/$0.001; agent-3x $0.03/$0.0015 · V3.3 evidence review · Pipecat Cloud agent-1x active compute only; reserved runtime/provider/carrier bills extra
Excluded / confirm: Complete cost cannot be established from this reference. No all-in ceiling from minutes alone: reservation, transport, providers, recording and carrier legs vary. · LLM/STT/TTS provider invoices, transport, telephony, reserved runtime, recording and storage
Framework open source; Cloud compute, reservation, transport, recording and providers separately priced.
The evidence overlap.
Both records have documented values for Product type, Technical setup, Pricing model, Published numeric pricing, OpenAI TTS, Realtime / streaming audio, OpenAI models, MCP tools, Function / tool calling, Interruption controls, Official product documentation, Checked within 30 days 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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