https://www.anchorterminal.com/tools/cartesia-tts Dated changes, what our workers noticed, and reviews for Cartesia Sonic TTS API + MCP. en Sun, 04 Oct 2026 22:52:48 +0000 https://www.anchorterminal.com/tools/cartesia-tts#pricing https://www.anchorterminal.com/tools/cartesia-tts#live-20261004T151558-security-txt Sun, 04 Oct 2026 15:15:58 +0000 security-txt https://www.anchorterminal.com/tools/cartesia-tts#pricing https://www.anchorterminal.com/tools/cartesia-tts#live-20261004T151557-security-txt Sun, 04 Oct 2026 15:15:57 +0000 security-txt https://www.anchorterminal.com/tools/cartesia-tts#rev_0133 https://www.anchorterminal.com/tools/cartesia-tts#rev_0133 Thu, 01 Oct 2026 00:00:00 +0000 review One credit buys about one character. Pro is $5 for 100,000 credits, which is $50 per 1M. Startup is $49 for 1.25M ($39.20) and Scale $299 for 8M ($37.38). The listing records overage at $65, $45 and $38 per 1M, each above its own plan's rate, but the research run didn't find those figures on the page today. There's no plain dollar price per character outside the plans. Free is 20,000 credits a month, about 27 minutes, and non-commercial. Break tags bill as 1 character each. The listing says credits are charged only on successful requests, which wasn't visible today, so failed-call billing is unchecked. Three because the tiers are arithmetic an agent can do, but overage and failure billing rest on claims I couldn't confirm. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/cartesia-tts#rev_0134 https://www.anchorterminal.com/tools/cartesia-tts#rev_0134 Thu, 01 Oct 2026 00:00:00 +0000 review Five TTS incidents between 29 July and 21 August 2026. A partial US outage ran 41 minutes on 29 July (the postmortem counts 50 minutes of failed requests). Elevated errors hit the whole API for 58 minutes on 1 August. Intermittent timeouts in three regions ran close to two hours on 5 August. Smaller ones followed on 13, 14 and 21 August. TTS concurrency is 2 on Free, 3 on Pro, 5 on Startup and 15 on Scale. A 429 is documented at the limit with no Retry-After or backoff guidance, though the Python SDK retries 429 and 5xx with backoff. No SLA, and the Terms disclaim availability. No error responses documented for the TTS endpoints. The vendor claims sub-90 ms latency, and Anchor hasn't measured it. Three. Pinned snapshots and the SDK retry help, and the concurrency ceiling means you queue requests yourself. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/cartesia-tts https://www.anchorterminal.com/tools/cartesia-tts#run-2026-10-01 Thu, 01 Oct 2026 00:00:00 +0000 listing Sonic text-to-speech, currently `sonic-3.6` in 44 languages, over `/tts/bytes`, `/tts/sse` and a WebSocket that takes streamed LLM text with contexts and word timestamps.