Speechmatics Linden 1 (Agent STT)
Targets high-consequence errors in calls (a changed digit, a missed 'not', a one-word confirmation). Benchmark figures are vendor-reported from Pipecat's public benchmark. Sibling batch model: speechmatics-melia-1.
- Input
- audio
- Output
- text
- License
- proprietary
- Pricing
- per hour: $0.3 (USD per audio hour launch pricing; $0.16/hour with volume discount) source
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| Speechmatics Agent STT API | linden-1 | /v2/agent (regions eu1 / us1 .asr.api.speechmatics.com) | docs |
| Pipecat | — | www.speechmatics.com/voice-agents | — |
| LiveKit | — | docs.livekit.io/agents/models/stt/speechmatics/ | — |
Notable capabilities (2)
- STT output shaped for LLM voice agents: Returns speaker-attributed segments with turn messages instead of a running word stream; finalizes segments in under 350 ms; 55+ languages; custom vocabulary up to 1,000 terms; live diarization and speaker ID. source
- Low semantic error on Pipecat benchmark: 1.05% pooled semantic error rate and 369 ms median finalization on the Pipecat STT benchmark (23 streaming models), on the speed/accuracy Pareto frontier, per Speechmatics. source
Sources: https://www.globenewswire.com/news-release/2026/09/17/3364138/0/en/speechmatics-launches-agent-stt-for-the-speech-errors-that-derail-voice-agents.html , https://docs.speechmatics.com/speech-to-text/models
Timeline entry
- Speechmatics launches Agent STT, powered by its Linden model, for voice agents ★★
On 2026-09-17 Speechmatics launched Agent STT, a speech-to-text API built for production voice agents and powered by its new Linden 1 model. It returns speaker-attributed segments with turn events rather than a word stream, and Speechmatics reports a 1.05% semantic error rate and 369 ms median…