OpenAI speech-to-text API vs Rev AI:Which is more popular?
In September 2026, Rev AI had more branded searches than OpenAI speech-to-text API among speech to text APIs worldwide. Rev AI had about 9,000 branded searches, while OpenAI speech-to-text API had 140. Rev AI made up 7.6% 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, OpenAI speech-to-text API appeared in three of the five answers and Rev AI in none.
Who do people search for more?
Rev AI, about 64 searches for every 1 for OpenAI speech-to-text API
Who does AI mention more?
OpenAI speech-to-text API, mentioned in 3 of 5 answers, Rev AI in 0
Who does AI recommend more?
OpenAI speech-to-text API, the only one of the two named
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Top speech to text APIs in ChatGPT and Google AI Overviews
In three ChatGPT questions and 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. Rev AI did not appear in any of the five 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 OpenAI speech-to-text API or Rev AI more popular in search?
This chart shows how often people search Google for OpenAI speech-to-text API and Rev AI 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 Rev AI, 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 OpenAI speech-to-text API and Rev AI comparison changed over the last 12 months?
3 findings
- Rev AI 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, 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.
- Across the 12 months ending September 2026, Rev AI’s share of searches among speech to text APIs worldwide moved from 9% to 7.6%, and its estimated monthly branded searches moved from 11K to 9K.
How did search popularity change for speech to text APIs worldwide in September 2026?
2 changes
In September 2026, Rev AI overtook Google Cloud Speech-to-Text to rank 4th among speech to text APIs worldwide, with 7.6% of the searches.
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?
3 search terms
Brandwave collects information about searches that people make online using OpenAI speech-to-text API’s and Rev AI’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.
OpenAI speech-to-text API
1 branded search term
- openai speech to text api
Rev AI
2 branded search terms
- rev ai
- revai
Other head-to-heads among speech to text APIs
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