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Anthropic's Opus 5 shows 0% prompt injection success rate

By PulseAugur Editorial · [1 sources] ·

Anthropic's Opus 5, when combined with Auto Mode, has demonstrated a 0% success rate in browser-based prompt injection attacks across 129 test scenarios. This represents a significant advancement in AI security, potentially solving one of the most critical vulnerabilities for AI agents operating within web browsers. Even without the additional Auto Mode protections, Opus 5 achieved a low 3.7% injection success rate, suggesting a robust defense mechanism. AI

IMPACT This breakthrough in prompt injection defense could significantly enhance the security and reliability of AI agents operating in web environments.

RANK_REASON The item details a specific security finding and success rate for a model in a research context. [lever_c_demoted from research: ic=1 ai=1.0]

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

Anthropic's Opus 5 shows 0% prompt injection success rate

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0 / 100
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Tool
The item details a specific security finding and success rate for a model in a research context. [lever_c_demoted from research: ic=1 ai=1.0]
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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.
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safety, product
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High
Clearly on-topic for AI-industry coverage.
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64 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

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COVERAGE [1]

  1. The Decoder TIER_1 English(EN) · Matthias Bastian ·

    Opus 5 may have solved browser-based prompt injection, the biggest security flaw haunting AI agents

    <p><img alt="" class="attachment-full size-full wp-post-image" height="639" src="https://the-decoder.com/wp-content/uploads/2025/11/prompt_injections_claude.png" style="height: auto; margin-bottom: 10px;" width="1146" /></p> <p> Opus 5 combined with Auto Mode hits a zero percent …

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