Resolved
Anthropic · Incident record · Jun 9, 03:13 UTC

Elevated errors on Claude Opus 4.8 (Fast Mode)

37/100
User-Impact Score · Degraded
2026-06-09 03:13 UTC — UIS 37
startedresolved

29m · Anthropic · scope unspecified · single-source — not confirmed.

Cite this incidentBibTeX · APA · MLA · Chicago · RIS
ai-receipts. (2026, June 9). Elevated errors on Claude Opus 4.8 (Fast Mode) [Incident record, methodology v1.0]. ai-receipts. https://aireceipts.org/incidents/anthropic:cmsxwks3fzd9
Embed this incidentiframe · CC-BY-4.0
<iframe src="https://aireceipts.org/incidents/anthropic:cmsxwks3fzd9?embed=1" title="Anthropic: Elevated errors on Claude Opus 4.8 (Fast Mode) — ai-receipts incident record" width="100%" height="420" loading="lazy" style="border:1px solid #e4e4e7"></iframe>
<p><a href="https://aireceipts.org/incidents/anthropic:cmsxwks3fzd9">Source: ai-receipts</a> · CC-BY-4.0</p>

Data record

UIS
37/100
Status
resolved
Started (UTC)
2026-06-09 03:13
Duration
29m
Components
claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
Scope
scope unspecified — see methodology limitations
Confirmation
Unconfirmed — single source or weak corroboration only.
Methodology
v1 · how this score was computed · provider status page

Evidence chain

Showing the first 100 of 472 provider updates and 1 of 1 matched signal observations. Full record in /data (372 additional rows).

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  101. Jun 9, 03:13 UTC
    First independent confirmation
  102. Jun 9, 04:02 UTC
    [hn keyword]

    Claude Fable 5

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  103. Jun 9, 04:02 UTC
    First official acknowledgment
    49 min after ai-receipts confirmation