# AssemblyAI: Major incident: Increased processing times and errors for Universal-3.5 Pro on the EU async endpoint

**Summary:** AssemblyAI’s major EU asynchronous transcription degradation delayed Universal-3 Pro and Universal-3.5 Pro requests and caused some failures. It started at 2026-10-05 10:21 UTC and was resolved at 2026-10-05 11:39 UTC (1 h 18 min); processing returned to normal, and failed requests can be safely resubmitted. The US endpoint and real-time services were unaffected. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-10-05 10:21 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/t922x5tcvs4n](https://stspg.io/t922x5tcvs4n)
- [Company: AssemblyAI](https://rewindex.com/company/assemblyai.md)
- Versions: before (none: first archived) → after incident\_version:2/rj1jhdzznzs3@1ad07b3bf2a1
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Increased processing times and errors for Universal-3.5 Pro on the EU async endpoint
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-10-05 10:21 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-10-05 11:39 UTC
```

**6. Added: Affected components**

```diff
+ APIs - Asynchronous API, Asynchronous API
```

**7. Added: Update** (investigating) · 2026-10-05 10:21 UTC

```diff
+ We have identified an issue affecting asynchronous transcription requests using Universal-3.5 Pro on our EU endpoint. Most of these requests are currently significantly delayed, and some have failed. Our team is working to restore normal processing. Our US endpoint and real-time services are not affected. We will continue to provide updates as more information becomes available.
```

**8. Added: Update** (identified) · 2026-10-05 10:38 UTC

```diff
+ We have identified the issue causing longer-than-usual processing times and some failed requests for asynchronous transcription using our Universal-3 Pro and Universal-3.5 Pro models on the EU endpoint. We are working to resolve this as quickly as possible and will provide further updates as soon as we can.
```

**9. Added: Update** (monitoring) · 2026-10-05 10:43 UTC

```diff
+ We have continued to work to resolve this issue and are now seeing processing times return to the normal ranges, but we are continuing to monitor to ensure good performance.
```

**10. Added: Update** (resolved) · 2026-10-05 11:39 UTC

```diff
+ This incident has been resolved. Between approximately 08:20 and 10:45 UTC, asynchronous transcription requests using Universal-3 Pro and Universal-3.5 Pro on our EU endpoint took longer than usual to complete, and some requests failed. Processing times have returned to normal ranges. Any requests that failed during this window can be safely resubmitted.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-10-05 10:21 UTC | Major incident: Increased processing times and errors for Universal-3.5 Pro on the EU async endpoint (this change) | degradation |

All AssemblyAI changes: [timeline](https://rewindex.com/company/assemblyai/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i10506a528fb829 · Markdown: https://rewindex.com/change/i10506a528fb829.md · JSON: https://rewindex.com/api/v1/changes/i10506a528fb829 · Generated 2026-10-18T03:29:30.332Z