The messages and what they mean
- Due to unexpected capacity constraints, Claude is unable to respond to your message. Please try again soon. — the model tier is saturated. Equivalent to the API's 529 overloaded. Wait a few minutes; switching to a smaller model in the model picker often works at once, because capacity is per model.
- Something went wrong / a spinner that never ends — a generic failure: an incident, a broken session token, or a browser extension interfering. Reload; if it persists, the checklist below.
- Approaching 5-hour limit. / 5-hour limit reached - resets 3:00 PM. — the plan's session window, consumed by tokens (long documents and long chats count most). It resets on its own at the time shown. Pro and Max also have weekly windows with the same behaviour; the usage limit page explains all of them.
- Your message will exceed the length limit for this chat. Try attaching fewer or smaller files or starting a new conversation. — the conversation plus attachments no longer fit. Start a new chat and put stable reference files in a Project.
- This conversation is too long to continue. Start a new chat, or remove some tools to free up space. — same limit, and the second half is the hint: every enabled connector or tool costs context in every message (#58521). Turn off the ones you are not using.
- There was an error logging you in — the sign-in round trip failed. Usually an extension, a stale cookie, a VPN exit the auth service dislikes, or an incident.
- Claude will return soon / the app down entirely — an outage; status.claude.com is the only useful page.
The five-minute checklist
- Open status.claude.com. If there is an active incident, stop here and wait.
- Hard reload (Ctrl+Shift+R / Cmd+Shift+R). Then log out and back in.
- Try a private window. If it works there, an extension is interfering; ad blockers and the Claude in Chrome extension are the usual suspects.
- Clear site data for claude.ai (cookies and storage), not the whole browser.
- Switch network: VPN off (or on), mobile hotspot instead of office Wi-Fi. Corporate proxies and some VPN exits break the login and the streaming response.
- Update the browser; try another one. The desktop and mobile apps are separate builds, so if one works and the other does not, the broken one is the app, not your account.
When the limit is the problem, not an error
Session and weekly windows are the plan working as designed, and there is no setting that moves them. The realistic options are: wait for the reset, upgrade to a plan with a larger window, or do the heavy work somewhere billed per token. The API has no session window; Claude Code, Cursor and any Anthropic-compatible client run on an API key, and through this gateway your first crypto top-up is doubled (+100%). For chat-style use the same key works in any client that speaks the Messages API.
export ANTHROPIC_BASE_URL=https://aiprimetech.io
export ANTHROPIC_API_KEY=your_gateway_key
claude # per-token billing, no 5-hour windowRelated pages
Claude Code in the terminal has its own set of messages: API Error 500, 529 overloaded, prompt is too long, 401 / 403, connection errors, OAuth login errors. Anthropic's list of claude.ai messages is in the support article.
Tired of fighting this one?
Run Claude Code through the AI Prime Tech gateway instead: the same Claude models on the gateway's own upstream accounts, two environment variables to switch, and new accounts get $5 in free API credit with code FIXIT — no card.
export ANTHROPIC_BASE_URL=https://aiprimetech.io
export ANTHROPIC_API_KEY=your_keyFrequently asked questions
Why does claude.ai say 'Due to unexpected capacity constraints'?
The model you selected is saturated on Anthropic's side. Wait a few minutes or pick a smaller model; it is the chat equivalent of the API's 529 overloaded error.
Why does claude.ai say 'Something went wrong'?
A generic failure: an incident, a stale session, or a browser extension. Check status.claude.com, hard reload, try a private window, clear site data for claude.ai, then another browser or network.
What does '5-hour limit reached' mean on Claude?
Your plan's session window is used up; it resets at the time shown. It is consumed by tokens, so long chats and large attachments empty it fastest. The API route bills per token and has no such window.
Is Claude down right now?
Check status.claude.com. If it shows an incident, no local fix helps; if it is green and claude.ai still fails, work through the browser checklist above.
Run Claude Code on the gateway
Same models, two environment variables, credits at 7.69× face value — or a flat-rate unlimited plan. New accounts: $5 in free API credit with code FIXIT.
Get an API key See unlimited plansAI Prime Tech is an independent API gateway and is not affiliated with, endorsed by, or sponsored by Anthropic. “Claude” and “Claude Code” are trademarks of Anthropic. Claude Code features described here follow Anthropic’s public documentation at the time of writing and change frequently; prices and model lists on this page are read from this gateway’s live settings.