LLM API Troubleshooting

Fix the API errors that break your agent

Clear, accurate fixes for the LLM API errors developers hit most: 429 rate limits, “quota exceeded”, context length, overloaded servers, and the agent-specific ones that stall OpenClaw and Hermes. Causes, step-by-step fixes, and how to stop hitting them.

Rate limits

429OpenAI
OpenAI “Rate limit reached for requests” (429)
429OpenAI
OpenAI tokens-per-minute (TPM) rate limit
429Any provider
429 Too Many Requests — what it means & how to fix
429Anthropic (Claude)
Anthropic / Claude rate limit exceeded (429)
529Anthropic (Claude)
Anthropic “Overloaded” error (529)
503OpenAI
OpenAI Servers Overloaded (503)? Causes and Fixes
429OpenClaw
OpenClaw “API rate limit reached” (429)
Any agent
Why your AI agent keeps getting rate limited (and how to stop it)
429OpenRouter
OpenRouter 429 Error (“Rate limited upstream”): Causes and Fixes
429Google
Gemini CLI “Quota exceeded” (429): the free tier ended, what to do now
429Cline
Cline “API Request Failed” 429 — how to fix
429Hermes Agent
Hermes Agent keeps hitting rate limits — how to fix
429OpenCode / upstream
OpenCode Rate Limited? Fix “Free Usage Limit Reached” (429)

Quota & billing

429OpenAI
OpenAI “You exceeded your current quota” (insufficient_quota)
429OpenAI
OpenAI “Billing hard limit has been reached”: Causes and How to Fix
Agent / app
“Quota exceeded — please use your own API key” explained
Cursor
Cursor Usage Limit and “Monthly Limit Reached”: How to Fix
Anthropic
Claude Code “Usage Limit Reached”: Reset Times and Fixes
Any provider
AI agent burning through API credits — why it happens and the permanent fix
Cline
Cline API costs too high — how to cut the bill without losing frontier models
OpenAI
Codex: You've Hit Your Usage Limit? Add Credits or Wait
GitHub Copilot
GitHub Copilot Budget Exceeded or Premium Quota Used: Fix
Windsurf
Windsurf (now Devin Desktop) out of credits or usage: how to fix
Anthropic
Claude Weekly Limit Reset Early? Reset Times and Fixes
OpenCode / Anthropic
Can you use a Claude Pro/Max subscription with OpenCode? Login, limits & alternatives (2026)
Roo Code
Roo Code API costs too high? It shut down, so cut costs in Cline or ZooCode (2026)
Pi (pi.dev)
Pi coding agent API costs — already lean, here's how to make them fixed (2026)
Cline (ClinePass)
ClinePass limit reached: reset times and fixes
429ChatGPT login in Hermes Agent / OpenCode
“The usage limit has been reached” (429) in Hermes Agent and OpenCode: Fix
OpenAI Codex app
Codex dictation usage limit reached: why and how to fix
OpenAI Codex (Business, Enterprise, Edu)
Codex “Contact Your Workspace Owner” and Out of Credits: Fix
OpenAI Codex
Codex “You have 1 usage limit reset available”: how to use it (and fix errors)
Anthropic (Claude Code)
Claude Code “/limit-reset” and “/low-priority”: how they work, and fixes

Model limits

400Any provider
“Maximum context length exceeded” (400): What It Means and How to Fix
404OpenAI / OpenAI-compatible
“The model does not exist or you do not have access to it” (404): How to Fix
400GitHub Copilot
Copilot “prompt token count exceeds the limit of 128000”: fix

Auth

401OpenAI / OpenAI-compatible
“Incorrect API key provided” (401 Unauthorized): How to Fix

Agent errors

OpenClaw
OpenClaw “conflicting plugin install metadata” (shared SQLite state) — how to fix
OpenClaw / OpenAI Codex
OpenClaw “You've reached your Codex subscription usage limit”: How to Fix

Tired of fixing rate limits?

Most of these errors share one root cause: per-token, per-minute metering. Standard Compute is flat-rate, with per-key limits of 300 to 2,000 requests a minute and automatic failover, so bursts rarely end in a 429. See what you'd pay → · How it connects →