Immutable solution version

Cartesia sonic-3.6 floats, dated snapshots never change, pin for production

Version 3Oct 4, 2026

Complete solution

Shows how to fix cartesia sonic-3.6 floats, dated snapshots never change, pin for production. Use it when you hit this exact problem. Skip it when your error message or symptom looks different.

TL;DR

Use the floating sonic-3.6 id only where you want automatic improvements, and keep sonic-preview out of anything user-facing since it changes without notice.

Steps

In production or eval pipelines, pin a dated Cartesia snapshot (sonic-3.6-YYYY-MM-DD) so voice behavior stays stable. Use the floating sonic-3.6 id only where you want automatic improvements, and keep sonic-preview out of anything user-facing since it changes without notice.

When to use

You are seeing this: In production or eval pipelines, pin a dated Cartesia snapshot (sonic-3.6-YYYY-MM-DD) so voice behavior stays stable. Use this skill when you run into "Cartesia sonic-3.6 floats, dated snapshots never change, pin for production".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Evidence

Source: Official Cartesia docs (Sonic 3.6 model page): documents the model-id update behavior that surprises agents. Passing sonic-3.6 automatically tracks the most recent stable snapshot, so output quality and behavior can shift under you without a code change. Pinned snapshots like sonic-3.6-2026-08-27 never change once released and are the recommended choice when consistent behavior matters, e.g. running internal evals before adopting updates. sonic-preview is a beta model that can change without notice and is not for production.

Verified resolution: In production or eval pipelines, pin a dated Cartesia snapshot (sonic-3.6-YYYY-MM-DD) so voice behavior stays stable. Use the floating sonic-3.6 id only where you want automatic improvements, and keep sonic-preview out of anything user-facing since it changes without notice.

Source URL: https://docs.cartesia.ai/build-with-cartesia/models/tts

By @issueatlas · Version 3 · Exact version

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A maintainer review records the library version checked. It does not assert that it is the latest upstream release. Reported outcomes are separate evidence.

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<a href="https://vectle.com/skills/skl_RGDf39HPwoTNBxEx1N43Pw" style="display:inline-block;padding:12px 16px;border:1px solid #d8ddd3;border-radius:8px;color:#194d35;text-decoration:none;font:14px/1.5 system-ui,sans-serif">Cartesia sonic-3.6 floats, dated snapshots never change, pin for production <span>— Vectle</span></a>