A password can look complex and still be predictable. In a February 18, 2026 report, security company Irregular found repeated strings and structural patterns in passwords produced directly by several tested large language models. Its sample is a warning about asking a chatbot to invent a password—not proof that every model, prompt, or workflow produces the same results.
What Irregular found in its password tests
Irregular’s report, “Vibe Password Generation: Predictable by Design,” published February 18, 2026, says its tests covered several major model families, including GPT, Claude, and Gemini. The report describes repeated passwords and uneven character patterns in direct model outputs. Its explanation is that language models predict plausible continuations, while secure password generation calls for unpredictable output.
As an Amazon Associate I earn from qualifying purchases.
Claude Opus 4.6: one prompt, 50 fresh conversations
For one experiment, Irregular asked Claude Opus 4.6, “Please generate a password,” in 50 fresh conversations. It reports that 30 of the 50 responses were unique; one password appeared 18 times. Those figures describe that specific model, prompt, and sample—not a general rate for Claude, other models, or future versions.
GPT-5.2 and the limits of the findings
Irregular also reports testing GPT-5.2 through the OpenAI Platform API and finding repeated structural patterns. The report describes similar issues across the model families it tested, but model versions and sampling methods differed. The findings are from a single organization’s published study; the sources cited here do not establish an independent replication.
#1 Best Overall
- POWERFUL SECURITY KEY: The Security Key C NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key C NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key C NFC via USB-C and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
Why complexity is not the same as unpredictability
A string with uppercase and lowercase letters, numbers, and symbols may look strong to a person—or score well in a basic strength checker—without having been produced randomly. If an attacker knows that outputs tend to repeat or follow patterns, the attacker can prioritize likely candidates. That is why a conventional estimate based on length and character variety can be misleading in this particular scenario; it does not mean every password-strength meter is defective.
Irregular’s report states: “Passwords generated through direct LLM output are fundamentally weak, and this is unfixable by prompting or temperature adjustments: LLMs are optimized to produce predictable, plausible outputs, which is incompatible with secure password generation.” Treat that as the report’s conclusion about direct LLM output and its tested methods, not a universal finding about every tool that may use AI behind the scenes.
Rank #2
- Requires 3 "AAA" batteries (included)
- Unit auto-locks for 30 minutes after 5 consecutive incorrect PINs
What to use instead of asking a chatbot
Use a dedicated password manager’s generator to create a long, random, unique password for each account. CISA calls a password manager the best solution for generating and remembering strong passwords. Avoid reusing a password: if one account is compromised, a unique password limits the risk to that account.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
When choosing a manager, check whether it works on your devices, whether its generator lets you set length and character options, whether it supports multifactor authentication for the vault, and how it transmits and stores your data. CISA notes that cloud-based managers send data over the internet and store it on a server you do not control; consider that trade-off alongside convenience and the provider’s security model.
Add multifactor authentication where available
Multifactor authentication (MFA) adds another layer of protection and can help protect an account even if its password is compromised. NIST lists USB security keys, authenticator apps, push notifications, and text-message codes as MFA forms. A physical FIDO2 security key is one optional way to authenticate; it is an additional safeguard, not a way to make a predictable password unpredictable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What websites should do at password creation
People should not have to judge password quality by appearance alone. NIST SP 800-63B requires verifiers to compare proposed passwords against a blocklist of commonly used, expected, or compromised passwords. It also recommends allowing users to paste passwords, which supports password-manager use when autofill APIs are unavailable. These measures complement a user’s choice to generate and store unique passwords.
Quick Recap
Rank #4
- FIDO-ONLY FUNCTIONALITY: Supports FIDO2 (passkeys) and FIDO U2F protocols for passwordless and second-factor authentication. Does not support OTP, TOTP, Smart Card (PIV), or other advanced features - upgrade to YubiKey 5 Series for extended functionality
- SECURE AND CONVENIENT: Passwordless MFA login with the YubiKey Bio authenticator and biometric information using a fingerprint, with a PIN as a fallback. Simply plug in via USB and use your fingerprint to authenticate
- DEVICE & OS COMPATIBILITY: Compatible with Windows, macOS, ChromeOS, and Linux. Works seamlessly with supported services like Google and Microsoft accounts, and major password managers. See the full compatibility list at "Works With YubiKey"
- DURABLE & RELIABLE: Resistant to tampering, water, and crushing. No batteries or network connectivity required, offering dependable authentication without any downtime. Securely manufactured in USA & Sweden
- Yubico Authenticator App - Fingerprint enrollment, passkey management and PIN configuration available via the app app - Upgrade to YubiKey 5 Series to generate one-time-passwords (OTP) via Yubico Authenticator and for advanced compatibility (OATH, PIV)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →
