Step-by-step guides for ChatGPT, Claude, Gemini, Perplexity, and more — how to use them, fix errors, and get the most out of every feature.
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.
Claude is available in most countries but is restricted in a handful of regions due to legal and compliance requirements. If you see a 'not available in your region' message, this is a genuine geographic restriction that cannot be bypassed through normal troubleshooting. However, if you are receiving the error despite being in a supported country, the issue is likely your IP address appearing to be in a restricted region — disabling your VPN or switching to a different network usually resolves this.
Claude Pro enforces a 5-hour rolling usage window — not a daily reset. When you exhaust that window, you must wait until the oldest messages age out before the quota refreshes. Free users face stricter caps with no fixed window. As of May 6, 2026, Anthropic removed peak-hour throttling for Pro and Max subscribers, so you no longer get slower responses during busy periods (5am–11am PT). To continue working sooner: upgrade to Max ($100–$200/month for 5x–20x more headroom), batch your messages, or switch to shorter conversations.
ChatGPT Plus costs $20/month and payment declines are most commonly caused by bank blocks on international or recurring online charges — call your bank to authorize the transaction, then retry once in an incognito window without VPN. If you were charged but Plus did not activate, sign out and back in and wait 15–30 minutes before contacting support.
Start with a clean session (sign out, clear cache/cookies, disable extensions), then verify plan/permissions, check status/incidents, and retry on another network. If it persists, capture logs/error details and contact support.
Claude Pro costs $20/month and payment declines are almost always caused by your bank blocking the charge, not a problem with Claude itself. Call your bank or approve the transaction in your banking app, then retry in a clean incognito window. If a 3D Secure prompt appeared and timed out, that is the most common single cause — complete the bank verification step and retry.
Start with the issue clusters most likely to solve common ChatGPT problems quickly.
Payment failed, subscription not activating, refunds, renewal issues, and premium features still locked.
Login loops, sign-in errors, invalid sessions, 2FA issues, and account access problems.
Message stream errors, conversation loading failures, blank pages, crashes, and missing history.
Rate limits, too many requests, usage caps, upload limits, and regional restrictions.
Chat assistant and AI platform.
194 issuesAI assistant for writing and analysis.
182 issuesAI image generation tool.
150 issuesAI answer engine.
157 issuesAutomation and agent tooling.
98 issuesGoogle's AI assistant and model platform.
1 issueAI-powered code editor.
1 issueAI coding assistant for developers.
1 issueFirst steps, account setup, and beginner guides.
2 issuesStep-by-step tutorials for features and common tasks.
5 issuesAdvanced techniques, productivity tips, and power-user guides.
1 issueTroubleshoot error messages and unexpected behavior.
200 issuesResolve usage limits, rate limits, account restrictions.
189 issuesFix payment failures, subscription issues, billing errors, refunds.
203 issuesFix login, verification, and access issues.
184 issuesChatGPT 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.