# Cerebras: Major incident: Partial Service Disruption Qwen 235B

**Summary:** _summary pending_
## Part of an outage event

- [Anthropic outage, Feb 4, 2026: 8 vendors, 8 incidents](https://rewindex.com/events/2026-02-04-anthropic)
- This incident started in the same window without naming Anthropic (timing only, not evidence of a link). (timing only, posted +21 min vs Anthropic’s own post)

```mermaid
flowchart LR
  root["Anthropic<br/>posted 16:39 UTC"]:::root
  h1["Within an hour<br/>2 vendors, 2 blamed Anthropic<br/>Cursor, Deepgram"]:::blames
  root --> h1
  me["Cerebras (this incident)<br/>posted +21 min"]:::me
  root -.->|"same window"| me
```

_Detected automatically from incidents that started together and named the same provider; a link means one incident named another vendor, not a confirmed cause._

- Kind: Major incident · Label: major (vendor)
- Changed: 2026-02-04 16:59 UTC · Detected: 2026-10-19 17:03 UTC
- [Source: https://stspg.io/yw8xjd2hzq5g](https://stspg.io/yw8xjd2hzq5g)
- [Company: Cerebras](https://rewindex.com/company/cerebras.md)
- Versions: before (none: first archived) → after incident\_version:665/7f3cpl78dkg4@e94879250327
- Change 1 of 1 for this incident

Incident page (full timeline): [Partial Service Disruption Qwen 235B](https://rewindex.com/company/cerebras/incidents/7f3cpl78dkg4.md)
## What changed

**1. Added: Title**

```diff
+ Partial Service Disruption Qwen 235B
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-02-04 16:59 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-02-05 02:07 UTC
```

**6. Added: Affected components**

```diff
+ Qwen-3-235B-Instruct-2507
```

**7. Added: Update** (investigating) · 2026-02-04 16:59 UTC

```diff
+ Qwen 235B performance is degraded and temporarily unavailable for some service tiers. We are currently working to resume normal service performance. We will provide further updates as we make progress.
```

**8. Added: Update** (monitoring) · 2026-02-04 18:53 UTC

```diff
+ As part of recent changes in traffic patterns and capacity, we are temporarily turning down rate limits for Pay-go users to help maintain a positive experience across the board. We understand the challenges this may create for you and your users, and we sincerely apologize for the inconvenience. We plan to monitor this endpoint and evaluate restoring rate limits in the next week. Thank you for your continued partnership and understanding, please reach out to our support team for any other questions.
```

**9. Added: Update** (investigating) · 2026-02-05 02:07 UTC

```diff
+ Between 06:00 AM PT and 06:00 PM PT users experienced service disruption with Qwen 3 235B Instruct. We have taken action to address recent changes in traffic patterns and capacity, reducing the disruption. We plan to monitor this endpoint and evaluate restoring rate limits in the next week for Pay Go users.
```

**10. Added: Update** (resolved) · 2026-02-05 02:07 UTC

```diff
+ Between 06:00 AM PT and 06:00 PM PT users experienced service disruption with Qwen 3 235B Instruct. We have taken action to address recent changes in traffic patterns and capacity, reducing the disruption. We plan to monitor this endpoint and evaluate restoring rate limits in the next week for Pay Go users.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-02-04 16:59 UTC | Major incident: Partial Service Disruption Qwen 235B (this change) | major |

All Cerebras changes: [timeline](https://rewindex.com/company/cerebras/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._


---
Canonical: https://rewindex.com/change/ib6e471dab430f3 · Markdown: https://rewindex.com/change/ib6e471dab430f3.md · JSON: https://rewindex.com/api/v1/changes/ib6e471dab430f3 · Generated 2026-10-19T23:13:29.595Z