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Anthropic's Claude Opus 5 (High) shows hallucination issues

By PulseAugur Editorial · [1 sources] ·

A user reported that Anthropic's Claude Opus 5 (High) model exhibited significant hallucination issues while assisting with API service catalog automation. When asked for the next steps to complete a feature, the model incorrectly suggested merging three pull requests, deviating from the original plan of one pull request plus one for testing. The user also noted that the model provided a nonsensical response when questioned about the identity of the third pull request. AI

IMPACT Highlights potential reliability issues in advanced models, impacting user trust and adoption for complex automation tasks.

RANK_REASON User report of model hallucination, not an official release or benchmark.

Read on r/ClaudeAI →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic's Claude Opus 5 (High) shows hallucination issues

How we ranked this

Signal score
2 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Commentary
User report of model hallucination, not an official release or benchmark.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
model release
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. r/ClaudeAI TIER_2 English(EN) · /u/Royal-Lead8456 ·

    Opus 5 (high) hallucination

    <table> <tr><td> <a href="https://www.reddit.com/r/ClaudeAI/comments/1wiuo70/opus_5_high_hallucination/"> <img alt="Opus 5 (high) hallucination" src="https://preview.redd.it/7ni9vzt163qh1.png?width=640&amp;crop=smart&amp;auto=webp&amp;s=2aa856b9ea87556a239da7db3cd978be6066b194" t…

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