Troubleshooting
What to do when Claude isn’t working. Interpreting error messages, fixing message-send errors, reducing hallucinations, and other common fixes.
26 articles
Is Claude's Korean Really Getting Worse? What's Actually Going On
Some users say Claude's Korean answers feel off lately. Here's what's officially documented versus what's likely a language-switching bug, context compaction, or prompting issue — plus fixes to try now.
Anthropic's Claude Misuse Reports: The Major Cases Explained
Anthropic's threat intelligence reports document real cases of Claude being misused for hacking, fraud, and influence operations — and how Anthropic detected and stopped them.
Fixing the Claude Payment Error "This Card Type Is Not Allowed"
Here's why Claude payments show "this card type is not allowed," which cards actually work according to official support docs, and how to get a Korean card through checkout.
Do 'One-Shot 100%' Claude Jailbreak Prompts Actually Work?
Prompts claiming to bypass Claude's safeguards in one shot keep circulating online. Here's why they can't reliably work, and what actually helps when Claude declines a request.
Why You Keep Hitting Claude's Usage Limit (And What to Do)
If Claude keeps cutting you off mid-conversation, here's how the usage limits actually work and what you can do about it.
Claude Sonnet 5's API Price Hike Was Cancelled — Here's What Changed
The September 1 price increase for Claude Sonnet 5's API was called off, and the $2/$10 introductory rate is now the standard price. Here's what that does and doesn't affect.
Why Claude Code Token Usage Suddenly Spikes, and 8 Ways to Cut It
If your Claude Code usage suddenly spiked, the cause is usually one of four things. Here is how to diagnose it and cut usage right away.
Is Claude's Usage Draining Too Fast? How Bug Fixes and Limit Resets Actually Work
When Claude's usage burns down faster than it should, a bug may be behind it. Using real past incidents, here's how to check whether your account is affected and what to do next.
Claude Opus 5 Suddenly Feels Off? 3 Real Reasons, Explained
When Claude Opus 5 suddenly gives an oddly weak or inconsistent answer, it usually comes down to one of three documented causes. Here's how to tell automatic model switching, a temporary outage, and hallucination apart.
Vibe Coding Done Right: How Professional Developers Actually Work With Claude
Vibe coding lets you build software by just describing what you want to an AI, but skipping verification can be risky. Here's the plan-then-verify loop professional developers actually use with Claude Code, explained step by step for beginners.
Why Does Claude Suddenly Stop Mid-Conversation? 4 Causes and How to Check
When a Claude conversation cuts off with no warning, it's usually one of four things: context limits, usage limits, a server error, or a rare safety-based conversation end. Here's how to tell which.
Claude Switched Models Mid-Conversation? Understanding and Disabling Flagged Auto-Switching
Why Opus 5 and Fable 5 / 5.1 show "your message was flagged" and switch models — it's a safety mechanism, not an error. You can turn it off in Settings > Capabilities; with it off, flagged requests pause instead of switching.
Feel Like Claude Got Dumber? A Context, Settings, and Model Checklist
When Claude's answers feel worse than before, here's a 5-to-10-minute self-checklist covering conversation length, model settings, personal customizations, and project knowledge.
Fixing Claude's 'File Limit Exceeded' Error: Upload Limits and How to Fix Them
When Claude blocks a file upload, it's almost always one of three limits — file count, file size, or total context. Here's the official numbers and a fix for each.
Claude Login Email Not Arriving — What to Do When Corporate Filters or Lost Email Access Block You
If Claude's login verification email never shows up, here's the checklist to run through first, plus how to cancel a subscription or delete an account you can no longer receive email for.
When Claude Refuses to Translate: How to Diagnose and Fix It
If Claude refuses to translate text or replies in the wrong language, the cause is usually one of four things: content filtering, copyrighted text, language settings, or a session length limit. Here's how to tell which one and fix it.
Claude "An Error Occurred" Message: Causes and Step-by-Step Fixes
Claude's generic "An error occurred" message is usually temporary. Here's how to narrow down the cause — server issues, session, browser extensions, or network — and fix it step by step.
Claude 529 Error (Overloaded): What to Do
When Claude's chat shows a 529 error or stops responding, here's what it means and the exact steps to try — from waiting it out to checking status.claude.com.
Claude "Something Went Wrong" Error: How to Fix It
The "Something went wrong" message on Claude's web or app chat screen usually clears up with a few simple checks. Here's a cause-by-cause fix guide based on Claude's official support documentation.
Claude "Your previous response is still processing" error: cause and fix
If Claude shows a "your previous response is still processing" error when you try to send a new message, here's why it happens and the order of steps to fix it, from waiting it out to starting a new conversation.
How to Check Claude Server Status — Know in One Minute Whether It's Down, and What "Server Busy" Messages Mean
When Claude stops working, check the official status page at status.claude.com first. How to read component status, incident stages, and how to subscribe to alerts.
Fix "Your Previous Message Wasn't Sent" in Claude — Causes & Steps (2026)
When Claude shows "Your previous message wasn't sent" or "Conversation content temporarily unavailable" and stops responding, here are the likely causes, step-by-step fixes, and how to check the official status.
Troubleshooting Claude Error Messages: Limits, Capacity, Login
A breakdown of common Claude error and warning messages by type — 5-hour usage limits, length limit errors, capacity constraints, and login errors — with official causes and fixes.
Claude File Upload FAQ: Formats, 500MB/20-file Limits, PDF Handling
FAQ on uploading files to the Claude app: supported formats (PDF/DOCX/XLSX...), chat 500MB/20-file vs Project 30MB limits, PDF page-based handling, and an upload-failure checklist — per the official Help Center.
6 Ways to Reduce AI Hallucinations with Claude
Six practical ways to reduce hallucination, where AI like Claude fabricates plausible but false content: ask for sources, ground on your material, separate fact from estimate, show reasoning, and cross-check.
Claude Not Working? Fix Login, Access & Errors (2026)
Symptom-by-symptom fixes for when Claude won't respond, won't log in, or shows errors — status page, cache, usage limits, and hallucination, with a quick table.