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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.
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.
ChatGPT Plus allows approximately 160 GPT-4o messages per 3-hour rolling window before automatically downgrading you to GPT-4o mini. Free users get roughly 10–15 GPT-4o messages per 3-hour window. The cap resets on a rolling basis — not at midnight — meaning if you sent your first message at 2 PM and hit the limit, you regain access around 5 PM, not at midnight. Switch to GPT-4o mini immediately to keep working while you wait.
ChatGPT is available in over 160 countries, but specific features — including Advanced Voice Mode, DALL-E image generation, and some GPT Store capabilities — roll out region by region and may not be available everywhere simultaneously. Check openai.com/policies/usage-policies for the current list of restricted countries and features before assuming the issue is account-specific.
ChatGPT temporary restrictions typically last 1–24 hours and are triggered by behaviors that look automated: rapid retries, frequent IP changes, VPN switching, or many failed logins within a short window. Stop retrying immediately, clear your session, disable VPN, and wait at least 30 minutes before attempting a clean sign-in from a stable network.
ChatGPT's context window limit is approximately 128,000 tokens for GPT-4o — roughly 100,000 words of combined input and output. When you hit 'request too large,' your conversation history plus your new message exceeds this limit. The fix is to start a new conversation and paste only the relevant context, rather than continuing in a thread that has grown too long.