Deepgram Flux Multilingual vs Speechmatics Linden
Deepgram Flux Multilingual is ahead on time to first text and final-text delay, and Speechmatics Linden on the Pipecat Dataset and the Ocular Dataset.
Quality and speed frontier
Every model's error rate on the public clips, against how long its transcript takes to settle.
The four metrics, side by side
Word error rate on 1,000 clips from Pipecat's STT benchmark dataset.
- Deepgram Flux Multilingual
- 4.96%14th
- Speechmatics Linden
- 2.46%6th
Speechmatics Linden, 2.50 points lower
Word error rate on eight licensed recordings provided by Ocular.
- Deepgram Flux Multilingual
- 4.53%13th
- Speechmatics Linden
- 3.93%6th
Speechmatics Linden, 0.60 points lower
Median delay before the first words arrive, from the first audio packet.
- Deepgram Flux Multilingual
- 793ms3rd
- Speechmatics Linden
- 1.19s7th
Deepgram Flux Multilingual, 397ms sooner
Median delay after the speaker stops before the transcript is final.
- Deepgram Flux Multilingual
- 114ms4th
- Speechmatics Linden
- 147ms6th
Deepgram Flux Multilingual, 33ms sooner
Lower is better on every metric. The small figure is each model's place in the whole field.
First text and final text, at three percentiles
Both measured on the same 206 streamed Ocular Dataset turns. P90 and P95 say what a caller meets on a bad turn, which a median hides.
| Measure | Model | P50 | P90 | P95 |
|---|---|---|---|---|
| Time to first text | Deepgram Flux Multilingual | 793ms | 2.00s | 3.41s |
| Speechmatics Linden | 1.19s | 1.56s | 2.52s | |
| Final-text delay | Deepgram Flux Multilingual | 114ms | 135ms | 141ms |
| Speechmatics Linden | 147ms | 192ms | 213ms |
Both against every other model
Open on the metric where the two sit furthest apart, with the other three a tab away.
Word error rate on 1,000 clips from Pipecat's STT benchmark dataset. Lower is better.
| # | Model | Pipecat Dataset | clips | |
|---|---|---|---|---|
| 1 | AssemblyAI Universal 3.5 Pro | 1.93% | 1,000 | |
| 2 | Google Chirp 3 | 2.00% | 1,000 | |
| 3 | Reson8 | 2.10% | 1,000 | |
| 4 | GPT Realtime Whisper | 2.16% | 1,000 | |
| 5 | Cartesia Ink 2 | 2.39% | 1,000 | |
| 6 | Speechmatics Linden | 2.46% | 998 | |
| 7 | Google Chirp 2 | 2.59% | 1,000 | |
| 8 | Inworld STT-1 | 2.72% | 1,000 | |
| 9 | GPT-4o Mini Transcribe | 3.35% | 1,000 | |
| 10 | Deepgram Nova-3 | 3.46% | 1,000 | |
| 11 | Smallest Pulse | 3.66% | 1,000 | |
| 12 | GPT-4o Transcribe | 3.90% | 1,000 | |
| 13 | Deepgram Flux English | 3.90% | 999 | |
| 14 | Deepgram Flux Multilingual | 4.96% | 999 | |
| 15 | Gradium | 6.48% | 1,000 |
Counts are the clips each model returned usable text for, so they differ between models and between datasets.
Both on the other two views
Pipecat vs Ocular accuracy
Every model's error rate on the public clips, against the same model on real conversations.
Transcription response time
How soon each model returns its first words, against how soon its transcript is final.
What the numbers rest on
| Model | Pipecat clips | Ocular recordings | Turns timed | Failed |
|---|---|---|---|---|
| Deepgram Flux Multilingual | 999 | 8 | 175 | 31 |
| Speechmatics Linden | 998 | 8 | 194 | 12 |
A clip counts only where the model returned usable text, so counts differ between models. Word error rate is measured the same way throughout: incorrect, missing, and extra words against the reference transcript.
Frequently asked questions
Is Deepgram Flux Multilingual or Speechmatics Linden more accurate?
On the 1,000 public Pipecat clips, Deepgram Flux Multilingual scores 4.96% and Speechmatics Linden 2.46%, so Speechmatics Linden makes fewer errors by 2.50 points. On the eight licensed Ocular recordings, Deepgram Flux Multilingual scores 4.53% and Speechmatics Linden 3.93%, so Speechmatics Linden makes fewer errors by 0.60 points. Word error rate counts incorrect, missing, and extra words against the reference transcript, so lower is better.
Which is faster, Deepgram Flux Multilingual or Speechmatics Linden?
Deepgram Flux Multilingual returns first text 397ms sooner, at 793ms against 1.19s at the median. Deepgram Flux Multilingual has the final transcript 33ms sooner, 114ms after the speaker stops against 147ms. Both are measured on the same 206 streamed turns.
How were Deepgram Flux Multilingual and Speechmatics Linden compared?
Both ran the same two datasets under the same conditions as every other model in the benchmark: 1,000 public clips from Pipecat's STT benchmark dataset and eight licensed conversation recordings from Ocular. Deepgram Flux Multilingual returned usable text for 999 of the public clips and Speechmatics Linden for 998. Latency uses each provider's own supported finalization contract.