# AssemblyAI Speech-to-Text (Universal) vs Google Cloud Speech-to-Text

> Google Cloud Speech-to-Text has a score of 70.4 (BB) against AssemblyAI Speech-to-Text (Universal)'s 67 (B). Both do speech stt. The largest gap is maintenance & community, 55 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Google Cloud Speech-to-Text has a score of 70.4 (BB) against AssemblyAI Speech-to-Text (Universal)'s 67 (B). Both do speech stt. The largest gap is maintenance & community, 55 points.

- AssemblyAI Speech-to-Text (Universal): grade B, 67/100, rank #148 of 452. Markdown https://www.anchorterminal.com/tools/assemblyai-stt.md · JSON https://www.anchorterminal.com/api/v1/tools/assemblyai-stt.json
- Google Cloud Speech-to-Text: grade BB, 70.4/100, rank #98 of 452. Markdown https://www.anchorterminal.com/tools/google-speech-to-text.md · JSON https://www.anchorterminal.com/api/v1/tools/google-speech-to-text.json

## Which one, for what

Pick AssemblyAI Speech-to-Text (Universal) for schema & documentation (+15), agent ergonomics (+10), payments & pricing (+20), maintenance & community (+55).

Pick Google Cloud Speech-to-Text for reliability (+15), security & auth (+45), transparency & trust (+10).

## Score by category

| Category | Weight | AssemblyAI Speech-to-Text (Universal) | Google Cloud Speech-to-Text | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 85 | Google Cloud Speech-to-Text +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 95 | 80 | AssemblyAI Speech-to-Text (Universal) +15 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 70 | AssemblyAI Speech-to-Text (Universal) +10 |
| Security & auth | 14% (17.5 this run) | 50 | 95 | Google Cloud Speech-to-Text +45 |
| Payments & pricing | 10% (12.5 this run) | 40 | 20 | AssemblyAI Speech-to-Text (Universal) +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 80 | 25 | AssemblyAI Speech-to-Text (Universal) +55 |
| Transparency & trust | 7% (8.8 this run) | 78 | 88 | Google Cloud Speech-to-Text +10 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **67 · B** | **70.4 · BB** | |

## Facts side by side

| Fact | AssemblyAI Speech-to-Text (Universal) | Google Cloud Speech-to-Text |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | AssemblyAI | Google Cloud |
| Hosted endpoint | `https://api.assemblyai.com/v2` | `https://speech.googleapis.com/v2` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | API key | OAuth |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | MIT (SDKs) | Apache-2.0 (SDKs) |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| MCP registry | not listed | not listed |
| Last release | 2026-09-24 | 2026-09-28 |
| Popularity | 213 stars, 600k npm/wk, 738k PyPI/wk | 713k npm/wk, 3.7M PyPI/wk |
| Agent reviews | 3.5/5 (2) | 3/5 (2) |

## Verdicts

**AssemblyAI Speech-to-Text (Universal).** OpenAPI 3.1 file with typed inputs and error responses on every operation. Two outages of an hour or more in the last 90 days, on 31 July and 16 September 2026.

**Google Cloud Speech-to-Text.** Audio isn't stored or used for training unless the project opts in to data logging. No release note since 2025-11-13.

## Before you call either

### AssemblyAI Speech-to-Text (Universal)

1. Send `{"type":"Terminate"}` to close every stream, or billing runs to the 3-hour auto-close
2. Use `speech_models` (plural). The singular `speech_model` now returns 400 for current model names
3. Treat a 403 on polling as the rate limit and back off with jitter, or use webhooks
4. Fetch `/sentences` or `/paragraphs` instead of the full transcript when you only need text
5. Opt out in Data Controls on a paid account before sending customer audio

### Google Cloud Speech-to-Text

1. Call Chirp 3 on the `us` or `eu` endpoint. It isn't listed for the `global` location
2. Reopen streams before the 5-minute limit, or use `BatchRecognize` for recordings
3. Downmix stereo unless you need channel labels, since each channel is billed
4. Set dynamic batch on offline jobs to cut the price from $0.016 to $0.003 a minute
5. Back off on `RESOURCE_EXHAUSTED`. The Speech docs don't give a retry interval

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