ChatGPT Plus ($20/month) in 2026 gives approximately 160 GPT-5.5 messages per 3-hour rolling window. GPT-4o was retired from ChatGPT in February 2026 and replaced by GPT-5.5 as the default model. o1 is limited to roughly 50 messages per week, o3-mini to 50 per day. When you hit the cap, ChatGPT falls back to a lighter model automatically.
Claude Pro costs $20/month (or $18/month billed annually) and gives approximately 5x the message quota of the free tier, plus priority access during peak hours. The exact daily message count is not published by Anthropic, but Pro users consistently report 100+ messages per day under normal use before hitting any cap. Limits reset on a rolling 8-hour window, not at a fixed midnight.
Claude's usage limits reset on a rolling 8-hour window, not at a fixed midnight. Free users typically get 10–20 messages before hitting the cap; Claude Pro users get approximately 5x that amount with priority access during peak hours. To continue immediately: upgrade to Claude Pro ($18/month billed annually), switch to Claude Haiku (separate, lighter cap), or start a fresh conversation to avoid heavy context overhead.
Perplexity Pro search limits changed in late 2025 from a daily cap to a weekly cap. As of 2026, Pro subscribers get approximately 200 Pro searches per week (not per day), with file uploads capped at 50 per week. Quick searches remain unlimited. Limits reset weekly, not at midnight UTC daily. If you hit the cap, switch to Quick search or wait for the weekly reset.
If your ChatGPT 2FA code is not working, the most common cause is a device clock that is more than 30 seconds out of sync — TOTP authenticator codes are time-based and invalid if your device time is wrong. Enable automatic time sync on your device and regenerate the code. If that fails, use one of your backup codes to log in and then re-enable 2FA.
ChatGPT temporarily restricts accounts after approximately 5–10 failed login attempts within a short period as a brute-force protection measure — the automatic cooldown typically lasts 15–30 minutes. Stop all login attempts immediately, wait at least 30 minutes, then try once from an incognito window on a clean network without a VPN.