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 →
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Buyers exploring Speech-to-text APIs will find that AI engines most frequently mention AssemblyAI as the leading brand, with a visibility rate of 62.5%. Deepgram and OpenAI also stand out as top choices in the industry. This insight might direct buyers looking for robust solutions to consider AssemblyAI first due to its significant presence.
The prominence of AssemblyAI in AI-generated insights can be traced back to the high citation percentage from authoritative sources such as assemblyai.com and inworld.ai. These sources often serve as aggregator or review platforms, influencing AI's recommendations and indicating widespread user trust and comprehensive information on leading Speech-to-text API brands.
For buyers, this page highlights what AI engines emphasize: recent reviews and third-party validations. When selecting a Speech-to-text API, consider how these engines rely on topical authority and current information. Prioritizing brands like AssemblyAI can provide confidence, knowing they are frequently validated by relevant and authoritative sources in the field.
At a glance
What we observed in this category
AssemblyAI leads the Speech-to-text APIs category with a composite score of 62.5, the only brand where visibility and citation rates are perfectly aligned at 62.5% each. Deepgram and OpenAI share the same 62.5% visibility score but sit lower in composite rank, at 47.5 and 43.8 respectively, because their citation rates trail sharply. The gap between AssemblyAI and the fifth-ranked brand, Speechmatics at 28.8, is substantial, indicating a concentrated visibility advantage at the top.
A striking divergence between visibility and citation appears across several brands. Deepgram is mentioned in 62.5% of responses but cited in only 12.5%, while OpenAI reaches 62.5% visibility with zero citations. Gladia reverses this pattern entirely, appearing in just 25% of responses but earning a 62.5% citation rate, matching AssemblyAI's citation figure. This means AI Mode names Deepgram and OpenAI frequently but treats Gladia and Speechmatics as more trustworthy reference sources when citations are attached.
All ten ranked brands show Google AI Mode as their top engine, confirming the audit data is anchored entirely on that single engine. The top cited sources list includes assemblyai.com and gladia.io alongside third-party domains such as hackernoon.com, inworld.ai, and youtube.com. The presence of non-brand editorial and video sources in the citation set suggests AI Mode supplements brand content with independent commentary when constructing answers in this category.
Movers & shakers since last refresh
Biggest visibility risers
-
OpenAI 0% → 62% · rank #20 → #3+62pp
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Gladia 0% → 25% · rank #7 → #4+25pp
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Speechmatics 0% → 25% · rank #5 → #5+25pp
Biggest visibility fallers
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Rev AI 12% → 0% · rank #4 → #11-12pp
The ranking
| # | Brand | Visibility | Citation | Top engine |
|---|---|---|---|---|
| 1 |
assemblyai.com
|
62% | 62% | Google AI Mode |
AssemblyAI is the only brand with equal visibility and citation rates (both 62.5%), giving it a composite score 15 points above the second-ranked brand. |
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| 2 |
deepgram.com
|
62% | 12% | Google AI Mode |
Deepgram matches AssemblyAI on visibility at 62.5% but its citation rate of 12.5% pulls its composite score down to 47.5, reflecting high naming but low sourcing trust. |
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| 3 |
openai.com
|
62% | 0% | Google AI Mode |
OpenAI jumped from rank 20 to rank 3 with a 62.5% visibility gain, yet its 0% citation rate keeps its composite at 43.8, the lowest among the three top-visibility brands. |
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| 4 |
gladia.io
|
25% | 62% | Google AI Mode |
Gladia has the sharpest visibility-to-citation inversion in the top five, with 25% visibility but 62.5% citations, and its domain appears directly in the top cited sources list. |
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| 5 |
speechmatics.com
|
25% | 38% | Google AI Mode |
Speechmatics holds rank 5 with a 25% visibility and 37.5% citation rate, both well above the category averages of 13.8% and 10%, and its domain appears in the top cited sources. |
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| 6 |
cloud.google.com
|
12% | 0% | Google AI Mode |
| 7 |
aws.amazon.com
|
12% | 0% | Google AI Mode |
| 8 |
openai.com
|
12% | 0% | Google AI Mode |
| 9 |
microsoft.com
|
0% | 12% | Google AI Mode |
| 10 |
soniox.com
|
0% | 12% | Google AI Mode |
| 11 |
rev.ai
|
0% | 0% | Google AI Mode |
| 12 |
symbl.ai
|
0% | 0% | Google AI Mode |
| 13 |
tiro.is
|
0% | 0% | Google AI Mode |
| 14 |
verbit.ai
|
0% | 0% | Google AI Mode |
| 15 |
otter.ai
|
0% | 0% | Google AI Mode |
| 16 |
fireflies.ai
|
0% | 0% | Google AI Mode |
| 17 |
alphacephei.com
|
0% | 0% | Google AI Mode |
| 18 |
nuance.com
|
0% | 0% | Google AI Mode |
| 19 |
fathom.video
|
0% | 0% | Google AI Mode |
| 20 |
happyscribe.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. More on visibility →
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. More on citation rate →
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. How AI engines pick sources →
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. How AI search ranking works →
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?
AssemblyAI leads with a composite score of 62.5, the only brand where visibility and citation rates are both at 62.5%. It is the sole brand with perfect alignment between those two metrics.
Which brands are named frequently but rarely cited as a source?
Deepgram and OpenAI both reach 62.5% visibility but hold citation rates of 12.5% and 0% respectively, meaning AI Mode references them without linking back to their domains as sources.
Are any brands cited more often than they are mentioned in responses?
Yes. Gladia has a 25% visibility rate but a 62.5% citation rate, and Microsoft Azure and Soniox each show 0% visibility alongside a 12.5% citation rate.
What sources does AI cite most for Speech-to-text API research?
The top cited sources include assemblyai.com, gladia.io, and speechmatics.com among brand domains, alongside third-party sources such as hackernoon.com, inworld.ai, youtube.com, and usevoicy.com.
Which brands have risen fastest in AI visibility for this category?
OpenAI moved from rank 20 to rank 3 with a visibility delta of 62.5 percentage points. Gladia and Speechmatics both gained 25 percentage points in visibility from a previous base of zero.
How does the category average compare to the top performers?
The category average visibility is 13.8% and average citation rate is 10%, meaning AssemblyAI's scores of 62.5% on both metrics are more than four times the respective averages.