OpenAI Audio Speech-to-Text vs AssemblyAI Speech-to-Text.
Live source-backed comparison for OpenAI Audio Speech-to-Text and AssemblyAI Speech-to-Text in Speech-to-text. The page updates from materialized radar candidates and stays out of the sitemap unless source coverage and unique data modules pass the quality gate.
Close call: choose by workflow
OpenAI Audio Speech-to-Text and AssemblyAI Speech-to-Text are close on automated fit for Speech-to-text. The better choice depends on access model, deployment preference, and source-backed evidence.
Automated fit scores are close enough that access and deployment needs matter more than the score gap.
- Sources
- 4
- Modules
- 7
- Freshness
- Updated 2026-06-26
OpenAI Audio Speech-to-Text
Official OpenAI Audio API transcription service for speech-to-text, translation, diarization, and realtime transcription workflows. official_service speech-to-text stt asr automatic speech recognition transcription realtime transcription audio text api hosted streaming speech recognition audio transcription speaker diarization translation
- hosted/API workflows where a managed service path matters.
AssemblyAI Speech-to-Text
Official AssemblyAI speech-to-text API service for prerecorded transcription, realtime transcription, and voice AI infrastructure. official_service speech-to-text stt asr transcription realtime transcription speech recognition audio text api hosted streaming audio transcription voice agent api language detection
- hosted/API workflows where a managed service path matters.
Side-by-side decision factors
Every row is derived from retained radar metadata. Unknown prices, benchmarks, dates, and capabilities stay unverified.
| Axis | OpenAI Audio Speech-to-Text | AssemblyAI Speech-to-Text | Edge | Basis | Source |
|---|---|---|---|---|---|
| Automated fit | RDR100 | RDR100 | Close / tie | Task fit from AI on Radar's materialized best-of ranking. | developers.openai.com |
| Access model | Paid API | Paid API | Close / tie | Access labels come from source-backed provider metadata and conservative repo/model signals. | openai.com |
| Hosted/API signal | Available | Available | Close / tie | Useful when the priority is a managed API or hosted service path. | developers.openai.com |
| Open-source/self-hosted signal | Not evident | Not evident | Close / tie | Useful when the priority is repository-level control, open-source access, or self-hosting. | developers.openai.com |
| Source coverage | 2 sources | 2 sources | Close / tie | Distinct retained source URLs available for this comparison. | developers.openai.com |
| Evidence freshness | 2026-06-26 | 2026-06-26 | Close / tie | Newest retained update date from the candidate record. | developers.openai.com |
- This pair is close across the visible comparison axes; use source links and access model fit as the deciding factors.
- Pricing, benchmark numbers, release dates, and context windows are shown only when source-backed; unknown facts stay unverified.
- This is an automated source-backed comparison, not an independent benchmark run.