Categories · Speech-to-Text & Transcription APIs

AssemblyAI vs OpenAI Speech-to-Text

AssemblyAI and OpenAI Speech-to-Text are both Speech-to-Text & Transcription APIs, compared here on pricing, compliance, capabilities, and developer experience from structured, cited data - not reviews or paid placement. AssemblyAI starts lower at $0.0025 per minute vs $0.003 for OpenAI Speech-to-Text. AssemblyAI supports webhooks for event-driven integration; the other does not document them. For coding-agent use, AssemblyAI scores higher on agent-friendliness (70 vs 50).

Comparedby a transparent data-readiness score computed from each API's published, sourced fields. No reviews, no paid placement. How we rank.

Data last verified 2026-06-21, with every field cited on each profile.

Head-to-head, from published, cited fields (auto-generated; no paid placement)
Field	AssemblyAI	OpenAI Speech-to-Text
Starting price	$0.0025 minute	$0.003 minute
Pricing model	Usage	Usage
Free tier	✗	✗
Self-serve signup	✓	✓
SOC 2	Type II	Type II
HIPAA	✓	✓
GDPR	✓	✓
Webhooks	✓	✗
Sandbox	✗	✗
Documented actions	22	11

Full data and citations: AssemblyAI · OpenAI Speech-to-Text. See more Speech-to-Text & Transcription APIs.