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OpenAI Realtime API vs Speechify
OpenAI Realtime API is positioned as speech-to-speech API for developers implementing their own voice application. Speechify is positioned as a developer TTS API under SpeechifyAI, distinct from the consumer reading subscription.
OpenAI Realtime API is positioned as speech-to-speech API for developers implementing their own voice application. Speechify is positioned as a developer TTS API under SpeechifyAI, distinct from the consumer reading subscription. Start by deciding who owns the missing layers, then inspect the documented differences below.
Developer Frameworks and Voice Engines are different product categories. An underlying engine or framework is not a complete substitute for a deployed agent workflow.
7 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 | Speechify |
|---|---|---|
| Billing modelDifferent records | component-stack | character-credit |
| Billing unitDifferent records | 1 million text/audio/image tokens; transcription separately metered | Monthly plan + character-based synthesis debited from USD usage balance |
| Bring your telephonyDifferent records | Yes | Unknown |
| Warm transferDifferent records | Unknown | Not applicable |
| Bring your modelShared state | Unknown | Unknown |
| HIPAA pathShared state | Unknown | Unknown |
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.
Paid monthly subscription includes USD usage balance consumed by character-priced synthesis. Agent quote separate.
Cached audio/text and image inputs have separate rates. Rate is not per-minute.
Captured pricing summary does not provide complete per-character rate/balance table; full pricing evidence requested. Do not use consumer reader plans.
Model scope fixed to GPT-Realtime-2, not all voice models.
Enterprise agent pricing excluded from this ladder.
Published Realtime token rates do not establish these account/contract terms. GPT-Live duration billing and unrelated fine-tuning discounts must not be imported.
Included USD usage balance and per-character usage, not all-in agent minutes.
Published Realtime token rates do not establish these account/contract terms. GPT-Live duration billing and unrelated fine-tuning discounts must not be imported.
Captured pricing summary does not provide complete per-character rate/balance table; full pricing evidence requested. Do not use consumer reader plans.
Published Realtime token rates do not establish these account/contract terms. GPT-Live duration billing and unrelated fine-tuning discounts must not be imported.
In-flight requests continue and small overshoot is possible; not a guaranteed complete monthly ceiling.
Repeated context, cache behavior and turn count affect token charges.
Separate provider credentials and buyer deployment.
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.
Self-serve TTS balance does not determine telephony, recognition, LLM and hosting spend; enterprise agent quote unknown.
Full bill requires measured model/token/cache/tool/carrier usage; conversation minutes alone are insufficient.
Self-serve TTS balance does not determine telephony, recognition, LLM and hosting spend; enterprise agent quote unknown.
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.
Speechify
Consumer and API plans are different products.
Free $0; Starter $10; Pro $99; Scale $499 per month · V3.3 evidence review · Starter TTS API plan; credit/character schedule unresolved; Enterprise Agents separate quote
Excluded / confirm: Complete cost cannot be established from this reference. Self-serve TTS balance does not determine telephony, recognition, LLM and hosting spend; enterprise agent quote unknown. · External STT, LLM, orchestrator, carrier and hosting
Paid monthly subscription includes USD usage balance consumed by character-priced synthesis. Agent quote separate.
The evidence overlap.
Both records have documented values for Product type, Technical setup, Pricing model, Published numeric pricing, Realtime / streaming audio, Checked within 30 days, Retained price snapshot. 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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