Are AIs Still Struggling with CAPTCHAs?

Schneier on Security

September 18, 2026 at 11:05 AM

Overview

Anthropic's AI model, Claude, is struggling with CAPTCHAs, which are designed to distinguish between human and machine input. In a recent test, Claude failed to correctly identify images that didn't match, leading to repeated confusion and self-questioning. This incident highlights ongoing challenges in AI's ability to perform simple tasks that humans find easy. The fact that Claude could not complete the task before the time expired raises questions about the reliability of advanced AI in practical applications. As AI technology continues to evolve, understanding these limitations is crucial for developers and users alike.

Key Takeaways

Affected Systems: Claude AI model by Anthropic
Timeline: Newly disclosed

Original Article Summary

Anthropic’s recent security-incident document contains a bit about how CAPTCHAs are still frustrating Claude. In the transcript, the Claude model that is so powerful that Anthropic is gatekeeping access to it appeared to slam its virtual head against the wall solving a simple image identification test. In a test where the agent was asked to identify a shape that didn’t match the others displayed, it couldn’t even decide which image to select. Instead, it repeatedly went over the same images and questioned its own conclusions. “Actually hmm, wait,” it said in its chain-of-thought transcript, later adding “Ugh,” because we’ve decided that we need to inject human mannerisms into these machines for some reason. The whole thing took so long that the agent eventually realized that the challenge had expired and it would have to start the process again...

Impact

Claude AI model by Anthropic

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Newly disclosed

Remediation

Not specified

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

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