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Linden 1 (Agent STT)
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Linden 1 (Agent STT) is a closed-weights speech-to-text model from Speechmatics, released September 2026. Licence: proprietary.
Catalogue identity notes
Speechmatics' voice-agent real-time model Linden 1, served by Agent STT (WebSocket /v2/agent, model linden-1); public launch article dated Sep 17, 2026 (selectable on LiveKit Inference since August 2026 per the article). Distinct from the catalogue's speechmatics-enhanced (Enhanced operating point).
Score within the Open ASR English short-form WER (March 2026) comparison set only.
$ how it compares
The speech-to-text models ranked either side of Linden 1 (Agent STT), out of 176 with a score, then more from Speechmatics.
| # | model | score | where | ||
|---|---|---|---|---|---|
| 3 |  Saarika v2.5 | 70±5 | comparison only | ||
| 4 |  Universal-3.6 Pro Realtime | 70±3 | api $0.0075/audio min | ||
| 5 | Linden 1 (Agent STT) | 69±3 | api $0.0050/audio min | ||
| 6 |  Soniox v5 Async | 68±5 | api $0.0017/audio min | ||
| 7 |  Ink-2 | 68±3 | api $0.0065/audio min | ||
| more from Speechmatics | |||||
| 42 | Speechmatics Enhanced | 60±2 | api $0.0067/audio min | ||
see all speech-to-text models · find the ones that fit your machine
$ what it's good at
other tests1 not in a task · 96% of its score
| test | result | vs the others in its run | counts |
|---|---|---|---|
| Pipecat STT Benchmark · pooled semantic WER (1000 smart-turn samples, Sonnet 5.5 judge) | 1.0% ✎ | ▃·▃▅·▅▅·▃▅██ beats 12/16 | 96% |
$ where to run it
Through an API
api · $0.0050/audio min · www.speechmatics.com ↗ · price sourceUSD per input audio minute: Speechmatics pricing page model data for 'Linden 1' (Voice agents, 'Only available as a Real-time model') gives realtime baseHourly 0.3, i.e. $0.30/hr (÷60); the launch article states 'Launch pricing is $0.30 per hour'. Product: Speechmatics Agent STT (wss /v2/agent). API model: linden-1. Price basis: published list rate, per-hour to per-minute scaling only. Exclusions: volume and model-training discounts (down to $0.16/hr). Currency: USD. Speechmatics official pricing page, observed 2026-10-09.
$ how the score was worked out · Pipecat STT Benchmark · seman… 96%
Each result implies a score on its own, after adjusting for how hard its test is and who ran it. The score is their weighted average, with a small pull toward the middle for thinly tested models. Each test's weight is its counts column above; here it's added up by who ran the tests. How it works
| source | results | share of the score |
|---|---|---|
 Pipecat STT Benchmark · semantic WER results table (pipecat-ai/stt-benchmark README) | 1 | 96% |
| prior · pull toward the middle | 4% | |
| weighted average | = 68.5 |
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