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AI tool error fixes (error code index)

Common errors across the OpenAI, Claude and Gemini APIs and Claude Code — with meaning, causes and fixes, grouped by service. Select an error to open its detailed fix page.

ChatGPT

ChatGPT status →
Something went wrongToo many requests in 1 hourA network error occurredUsage cap reached (GPT-4o/GPT-5)Conversation not found

OpenAI API

OpenAI API status →
429 Too Many Requests401 Unauthorized500 Internal Server Error503 Service UnavailableTimeout / gateway timeout403 Forbidden502 Bad Gateway400 invalid_request_error

Codex

Codex status →
Usage limit reached429 rate limit

Claude

Claude status →
Message limit reachedClaude is experiencing high demandUnable to connectMessage/conversation too longOutput blocked by content policy

Claude API

Claude API status →
429 rate_limit_erroroverloaded_error (529)401 authentication_error400 invalid_request_error500 api_errorTimeout (request timed out)

Claude Code

Claude Code status →
Claude usage limit reachedConnection error / fetch failedAPI Error 529 (overloaded)API Error 500MCP server failedPrompt is too longService overloaded (busy)

Gemini

Gemini status →
Something went wrongNot available in your countryCan't create images right now

Gemini API / AI Studio

Gemini API / AI Studio status →
429 RESOURCE_EXHAUSTED503 UNAVAILABLE403 PERMISSION_DENIED500 INTERNAL400 INVALID_ARGUMENT

Cursor

Cursor status →
Too many requests / rate limitConnection failed

GitHub Copilot

GitHub Copilot status →
Authentication failedQuota exceeded / completions limit
AI Tool Errors: Causes & Fixes | Error Code List (ChatGPT/Claude/Gemini/API)