Speech-to-text APIs: AI search visibility ranking (2026)
How AI search engines rank speech-to-text apis by visibility and citations. 20 brands measured monthly across Google AI Mode: which brands the AI names in answers, which domains it cites as sources, and how the leaders compare. Speech-to-text APIs used to transcribe calls, meetings, media, and voice interactions into searchable text and downstream workflows. Composite score: 70% visibility (% of AI answers naming the brand) + 30% citation rate (% citing the brand's domain). Full methodology →
Refreshed Jun 18, 2026Download this ranking as a PDF
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At a glance
What we observed in this categoryauto-generated
OpenAI now leads the Speech-to-text APIs category with a 75% visibility score, up from 12.5% previously, a delta of 62.5 percentage points in a single period. That rise pushed AssemblyAI, Deepgram, and Speechmatics each down one rank. The category average visibility sits at just 9.4%, meaning OpenAI is running at roughly eight times the average. The gap between first and fourth place (Rev AI at 12.5%) is large enough to suggest a three-brand cluster at the top and a sharp drop-off below it.
Speechmatics presents the clearest divergence between visibility and citation in this dataset. It holds 0% visibility yet carries a 25% citation rate, matching AssemblyAI which has 50% visibility and 25% citations. OpenAI, the visibility leader, has a 0% citation rate despite its dominant presence score. This pattern means AI Mode names OpenAI frequently without linking to it, while Speechmatics is being cited as a source without being named in conversational answers, signalling two very different modes of AI recognition.
Every brand in the top 10 records Google AI Mode as its top engine, confirming the audit is concentrated entirely on that single surface. The top cited sources list includes youtube.com, reddit.com, usevoicy.com, assemblyai.com, speechmatics.com, gladia.io, brasstranscripts.com, and cloud.google.com. Third-party and community sources such as YouTube and Reddit appear ahead of most vendor domains, which suggests Google AI Mode is anchoring its responses on review and discussion content rather than vendor-owned pages for this category.
Movers & shakers since last refresh
Biggest visibility risers
-
OpenAI 12% → 75% · rank #7 → #1+62pp
Biggest visibility fallers
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Speechmatics 38% → 0% · rank #4 → #5-38pp
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AssemblyAI 75% → 50% · rank #1 → #2-25pp
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Deepgram 62% → 50% · rank #2 → #3-12pp
The ranking
| # | Brand | Visibility | Citation | Top engine |
|---|---|---|---|---|
| 1 |
openai.com
|
75% | 0% | Google AI Mode |
OpenAI leads at 75% visibility, roughly eight times the 9.4% category average, but holds a 0% citation rate, the largest visibility-to-citation gap among all ranked brands. |
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| 2 |
assemblyai.com
|
50% | 25% | Google AI Mode |
AssemblyAI sits at 50% visibility and 25% citation rate, the only brand besides Speechmatics to earn citations, though its visibility has fallen 25 points from a previous high of 75%. |
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| 3 |
deepgram.com
|
50% | 0% | Google AI Mode |
Deepgram matches AssemblyAI on visibility at 50% but holds a 0% citation rate, and has declined 12.5 points from 62.5% visibility in the prior period. |
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| 4 |
rev.ai
|
12% | 0% | Google AI Mode |
Rev AI records just 12.5% visibility and 0% citations, placing it well below the top three cluster and only marginally above the 9.4% category average. |
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| 5 |
speechmatics.com
|
0% | 25% | Google AI Mode |
Speechmatics has dropped to 0% visibility from 37.5% previously, yet retains a 25% citation rate, making it the only brand in the top five cited without any conversational visibility. |
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| 6 |
cloud.google.com
|
0% | 12% | Google AI Mode |
| 7 |
gladia.io
|
0% | 12% | Google AI Mode |
| 8 |
soniox.com
|
0% | 0% | Google AI Mode |
| 9 |
symbl.ai
|
0% | 0% | Google AI Mode |
| 10 |
aws.amazon.com
|
0% | 0% | Google AI Mode |
| 11 |
microsoft.com
|
0% | 0% | Google AI Mode |
| 12 |
tiro.is
|
0% | 0% | Google AI Mode |
| 13 |
verbit.ai
|
0% | 0% | Google AI Mode |
| 14 |
otter.ai
|
0% | 0% | Google AI Mode |
| 15 |
fireflies.ai
|
0% | 0% | Google AI Mode |
| 16 |
alphacephei.com
|
0% | 0% | Google AI Mode |
| 17 |
nuance.com
|
0% | 0% | Google AI Mode |
| 18 |
fathom.video
|
0% | 0% | Google AI Mode |
| 19 |
happyscribe.com
|
0% | 0% | Google AI Mode |
| 20 |
openai.com
|
0% | 0% | Google AI Mode |
Sources AI engines trust in this category
Across the 8 buyer-intent queries we ran on speech-to-text apis, these are the domains Google AI Mode cited most often. If you're not on this list — or if your competitors are — that's a concrete PR / linkbuilding target.
How to read this ranking
Four things worth knowing before you act on the numbers above. These are the same definitions across every industry page — for category-specific observations, see the What we observed section above (where available) and the per-brand insights inline in the ranking.
Visibility = being named
A brand's visibility % is the share of AI answers that mention it by name in the response prose. This is who AI engines actively recommend to the buyer.
Citation rate = being trusted
Citation rate is the share of AI answers that include the brand's domain as a clickable source link. This is what the AI treats as authoritative evidence — different from being named.
Top engine differs by brand
The "top engine" column shows which AI surface each brand performs best on. Big gaps between a brand's score across engines usually points to specific content or schema gaps.
Rankings move month to month
AI engines re-crawl and re-rank on shorter cycles than classical search. We re-audit every brand on this list at least every 30 days and refresh this page automatically.
Get your own speech-to-text apis brand audited
The brands above were curated from public market-leader lists. Want the same measurement against your own brand — including the queries you appear on, which competitors get named instead, and a prioritised fix list? Run a free preview.
Frequently asked about speech-to-text apis AI visibility
Who leads AI visibility in Speech-to-text APIs right now?
OpenAI leads with 75% visibility, rising from 12.5% in the prior period, a gain of 62.5 points. AssemblyAI and Deepgram follow at 50% each, with every other brand at 12.5% or below.
Which brands are being cited most by Google AI Mode in this category?
AssemblyAI and Speechmatics each carry a 25% citation rate, the highest in the category. Google Cloud and Gladia follow at 12.5% each, while OpenAI, the visibility leader, has a 0% citation rate.
What sources does Google AI Mode anchor on for Speech-to-text API research?
The top cited sources include youtube.com, usevoicy.com, reddit.com, assemblyai.com, speechmatics.com, gladia.io, brasstranscripts.com, and cloud.google.com, with community and third-party sites appearing before most vendor domains.
Which brand has seen the biggest visibility change recently?
OpenAI is the biggest riser, gaining 62.5 visibility points to reach 75%. Speechmatics is the biggest faller, losing 37.5 points to drop to 0% visibility in the current period.
Is there a meaningful difference between being named and being cited in this category?
Yes. OpenAI is named in 75% of responses but cited in 0%, while Speechmatics is cited in 25% of responses despite 0% visibility, showing that AI Mode treats naming and sourcing as distinct behaviours in this category.
How concentrated is AI visibility in Speech-to-text APIs compared to the category average?
The category average visibility is 9.4%, while the top three brands score 50-75%, indicating visibility is heavily concentrated in a small cluster with most of the 20 brands scoring at or near zero.