AssemblyAI vs OpenAI speech-to-text API:Which is more popular?
In September 2026, AssemblyAI had more branded searches than OpenAI speech-to-text API among speech to text APIs worldwide. AssemblyAI had about 18,100 branded searches, while OpenAI speech-to-text API had 140. AssemblyAI made up 15.3% of all speech to text API searches we track, and OpenAI speech-to-text API accounted for 0.12%. When we asked ChatGPT and Google AI Overviews about speech to text APIs, AssemblyAI appeared in four of the five answers and OpenAI speech-to-text API in three. OpenAI speech-to-text API was mentioned before AssemblyAI in three out of four answers.
Who do people search for more?
AssemblyAI, about 129 searches for every 1 for OpenAI speech-to-text API
Who does AI mention more?
AssemblyAI, mentioned in 4 of 5 answers, OpenAI speech-to-text API in 3
Who does AI recommend more?
OpenAI speech-to-text API, named ahead of AssemblyAI in 3 of 4 answers
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Top speech to text APIs in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, AssemblyAI was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. OpenAI speech-to-text API was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. OpenAI speech-to-text API was listed before AssemblyAI in three out of four answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- AssemblyAI4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Google Cloud Speech-to-Text4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Deepgram3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers- OpenAI speech-to-text API3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Amazon Transcribe1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Speechmatics0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Rev AI0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about speech to text APIs
5 answers
Asked ChatGPT
“Which speech to text API should I use?”
Asked ChatGPT
“What are the best speech to text APIs?”
Asked ChatGPT
“What's the best speech to text API for an app workflow?”
Searched Google, AI Overview
“speech to text api”
Searched Google, AI Overview
“speech recognition api”
Not named in any answer:
Brands are shown in the order each answer named them. The survey took place in the United States on October 21, 2026.
Is AssemblyAI or OpenAI speech-to-text API more popular in search?
This chart shows how often people search Google for AssemblyAI and OpenAI speech-to-text API by name. Each line represents a brand's share of searches for all seven speech to text APIs we track, month by month, from English-language searches worldwide.
Share of searches by month for AssemblyAI, OpenAI speech-to-text API. The figures are in the table below the chart.
View monthly share of searches table
| Month | Deepgram | AssemblyAI | Speechmatics | Rev AI | Google Cloud Speech-to-Text | Amazon Transcribe | OpenAI speech-to-text API |
|---|---|---|---|---|---|---|---|
| Oct 2025 | 49.5% | 14.8% | 12.1% | 9% | 9.9% | 4.4% | 0.17% |
| Nov 2025 | 46.6% | 17.1% | 11.4% | 11.3% | 9.3% | 4.1% | 0.13% |
| Dec 2025 | 56.7% | 13.9% | 9.3% | 8.3% | 7.6% | 4.1% | 0.13% |
| Jan 2026 | 54.3% | 16.3% | 8.9% | 9.9% | 7.3% | 3.2% | 0.13% |
| Feb 2026 | 53.5% | 16% | 8.7% | 7.8% | 10.7% | 3.2% | 0.15% |
| Mar 2026 | 56.2% | 16.8% | 7.5% | 7.4% | 9.2% | 2.7% | 0.13% |
| Apr 2026 | 55.3% | 16.6% | 7.4% | 7.3% | 11.1% | 2.2% | 0.13% |
| May 2026 | 58.1% | 17.4% | 7.8% | 6.3% | 7.8% | 2.3% | 0.31% |
| Jun 2026 | 60.7% | 14.9% | 8.1% | 6.6% | 6.6% | 2.4% | 0.72% |
| Jul 2026 | 59.7% | 14.6% | 8% | 6.5% | 8% | 1.9% | 1.3% |
| Aug 2026 | 60.3% | 14.7% | 8.1% | 6.8% | 8.1% | 2% | 0.17% |
| Sep 2026 | 62.5% | 15.3% | 8.4% | 7.6% | 3.7% | 2.4% | 0.12% |
How has the AssemblyAI and OpenAI speech-to-text API comparison changed over the last 12 months?
3 findings
- AssemblyAI was ahead of OpenAI speech-to-text API in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, AssemblyAI’s share of searches among speech to text APIs worldwide moved from 14.8% to 15.3%, and its estimated monthly branded searches held steady at 18.1K.
- Across the 12 months ending September 2026, OpenAI speech-to-text API’s share of searches among speech to text APIs worldwide moved from 0.17% to 0.12%, and its estimated monthly branded searches moved from 210 to 140.
How did search popularity change for speech to text APIs worldwide in September 2026?
2 changes
In September 2026, AssemblyAI gained share of searches among speech to text APIs worldwide, from 14.7% to 15.3%.
Estimated monthly branded searches for OpenAI speech-to-text API worldwide fell 33.3% over 12 measured months, from 210 to 140 in September 2026.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using AssemblyAI’s and OpenAI speech-to-text API’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
AssemblyAI
1 branded search term
- assemblyai
OpenAI speech-to-text API
1 branded search term
- openai speech to text api
Other head-to-heads among speech to text APIs
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