Capability change
Capability change announced Mar 2026
Cartesia documents a capability change: “Error responses — For Cartesia-Version: 2026-03-01, we now return structured JSON.”
- Hosting route
- First-party API
- Affected scope
- Not stated in the notice
- Announced
- Mar 2026
- First seen by ModelClock
- Oct 3, 2026
What the provider published
docs.cartesia.ai ↗
- Error responses — For
Cartesia-Version: 2026-03-01, we now return structured JSON. See API Errors.
- API versions before
2026-03-01continue to return legacy error formats (for example HTTPTitle: Message).- Voices —
PATCH /voices/{id}: voice owners can now update accent and gender. Voice creation validates language. Invalid voice UUIDs and pronunciation-dictionary IDs return 404 instead of ambiguous errors.- PVC model routing — PVC voices require a dated model ID (e.g.
sonic-3-2026-01-12) instead ofsonic-3. See Pro Voice Clone.
Read from the provider's text; the quote is the provider's exact lines.