Bottom line: Anthropic is investigating allegations of a data breach following Claude’s outage on June 5, 2026, but has so far only confirmed infrastructure problems and no additional data incidents.
Anthropic has resolved a two-hour outage of its AI assistant Claude and is simultaneously investigating reports that other users’ data may have become visible during the disruption. A developer reported receiving third-party data.
The outage began on June 5, 2026 at 15:19 UTC and affected five Claude models: Opus 4.5, 4.6, 4.7, 4.8, and Sonnet 4.6. Claude API, Claude Code, Claude AI, and Claude Cowork were impacted with significantly elevated error rates. Technicians identified the problem approximately 20 minutes after it began and restored full availability by 18:27 UTC. On Downdetector, outage reports in the United States reached nearly 1,000: 40 percent for Claude Chat, 33 percent for Claude Code, 20 percent for the mobile app.
A New York developer reported on X that Claude had displayed another user’s response to him during the disruption. This post spread rapidly across social media. Thariq Shihipar, Claude Code engineer, explained that the incident was caused by an infrastructure failure, not an inference error. According to Anthropic, it has received no further reports or evidence of a data breach, but takes all such reports seriously and is investigating them. It remains unclear in subsequent discussions whether third-party data was actually transmitted or whether the model had incorrectly generated these outputs.
The current incident is part of a series of operational disruptions. In June 2026 alone, there were already multiple performance degradations: On June 3, a three-hour Opus 4.7 outage disrupted automated security checks and code routines. On June 1 and 2, Sonnet and Opus models experienced hours-long elevated request errors. In March 2026, Claude experienced a global outage, which Anthropic attributed to faulty API methods. In April 2026, additional errors occurred in Sonnet 4.6 and Claude AI following multi-day breakdowns. Anthropic did not disclose the exact causes of these April outages.
Source: www.it-daily.net · Published June 8, 2026
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