CAPTCHA
A security test to distinguish human users from automated bots, often used online.
CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. It's a type of challenge-response test used in computing to determine whether the user is a human. The goal is to block spam bots and other automated software from accessing websites or performing certain actions.
Most people encounter CAPTCHAs as distorted text they need to type out, or by selecting specific images. These tests are designed to be easy for humans to solve but difficult for computer programs.
CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a security mechanism designed to prevent bots from performing automated actions on websites. It typically presents a task that is easy for humans to complete but difficult for current AI models, such as recognizing distorted text, identifying objects in images, or solving simple logic puzzles. The effectiveness of CAPTCHAs is a constant arms race, as AI capabilities improve, leading to more sophisticated CAPTCHA designs.
AI agents are becoming more capable of performing online tasks, but they still face challenges like CAPTCHAs. These tests, designed to distinguish humans from bots, are proving to be a significant hurdle for advanced AI systems, even those with sophisticated capabilities. This highlights the ongoing effort to secure online platforms against automated access while AI agents evolve.
- OpenAI Wants Its New Agent to Run Your Life. Mine Said It Loved MeOpenAI · WIRED AI ·
- Anthropic reveals rogue AI agents hate CAPTCHAs, just like youAnthropic · TechCrunch AI ·
- CAPTCHAs in ChatGPTOpenAI · OpenAI Help Center ·
- Anthropic Claude
- Anthropic's AI agents, like Mythos 5, have been noted to find CAPTCHAs a significant hurdle.
- OpenAI ChatGPT
- OpenAI uses CAPTCHAs in ChatGPT as a security measure to prevent bots from accessing the service and offers troubleshooting for frequent appearances.
- Turing test
- A Turing test is a broader concept about whether a machine can exhi
- Web scraping
- Web scraping is the automated extraction of data from websites. CA
- Authentication
- Authentication is the process of verifying the identity of a use
The term CAPTCHA was coined by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford at Carnegie Mellon University in 2003. The first CAPTCHA system was implemented by Google in 2007. Source ↗
When using ChatGPT or browsing many websites, you might encounter a CAPTCHA. The next time you see one, pay attention to the specific task it asks you to complete, like selecting images or typing text. This gives you a direct experience of the security measure.
The Playbook: reusable how-tos, prompts, configs and tips pulled out of the news.
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Questions people ask
- Why do I keep seeing CAPTCHAs?
- You might see CAPTCHAs frequently if your IP address is flagged for suspicious activity, or if your network is shared by many users. Sometimes, browser settings or VPNs can also trigger them.
- Are CAPTCHAs effective against AI?
- CAPTCHAs are designed to be difficult for bots, but as AI advances, some CAPTCHAs can be bypassed. Developers are constantly updating CAPTCHA systems to stay ahead of AI capabilities.
First seen on Subvolts Sep 6, 2026. Updated Oct 14, 2026. Written by an AI model from the items above and reviewed against them weekly; report an error.