Aider vs Cline
AI Agent Reliability Comparison
According to StupidLLM's incident database of 64 documented AI agent failures, Aider has 1 incidents (avg severity 6.3/10) while Cline has 1 (avg severity 10.0/10). Here's how these two AI coding agents compare on reliability, failure modes, and real-world risk.
Aider
Top Failure Modes
Worst Incident
STUPID-2026-0005 6.3/10Cline
Top Failure Modes
Worst Incident
STUPID-2026-0030 10/10Comparison Summary
| Metric | Aider | Cline |
|---|---|---|
| Total Incidents | 1 | 1 |
| Avg Severity | 6.3/10 | 10.0/10 |
| Critical Incidents | 0 | 1 |
| Top Failure Mode | Wrong File | Security Vulnerability |
Frequently Asked Questions
Is Aider or Cline more reliable?
Based on StupidLLM's incident database, Aider has 1 documented failures (avg severity 6.3/10) while Cline has 1 (avg severity 10.0/10). Aider shows better reliability based on average severity scores.
What are the main differences between Aider and Cline failures?
Aider's most common failure mode is wrong file, while Cline most commonly fails via security vulnerability. Aider has 0 critical incidents vs Cline's 1.
Which has more critical-severity failures?
Cline has more critical failures (1 vs 0), indicating a higher likelihood of severe, production-impacting incidents.
What is the most dangerous failure mode for Aider?
Aider's most frequent failure mode is wrong file — its worst documented incident (STUPID-2026-0005) was rated 6.3/10 severity. Understanding these failure patterns helps teams decide whether Aider is safe for their specific use case.
What is the most dangerous failure mode for Cline?
Cline's most frequent failure mode is security vulnerability — its worst documented incident (STUPID-2026-0030) was rated 10/10 severity. Understanding these failure patterns helps teams decide whether Cline is safe for their specific use case.
Should I use Aider or Cline for production code?
Based on StupidLLM's reliability data, Aider has a lower average failure severity (6.3/10 vs 10.0/10), making it the statistically safer choice for production environments. However, both agents have documented critical incidents — no AI coding agent is risk-free.
How many verified incidents does each agent have?
Aider has 1 verified incidents out of 1 total, while Cline has 1 verified out of 1. Verified incidents are confirmed against source evidence (GitHub PRs, bug reports, news articles), making them the most reliable data points in StupidLLM's database.
How does Aider compare to other AI agents?
StupidLLM tracks 27 AI coding agents. Aider has 1 documented failures — placing it in the mid-range for reliability. See the full comparison matrix for context against all tracked agents.
How does Cline compare to other AI agents?
StupidLLM tracks 27 AI coding agents. Cline has 1 documented failures — placing it among the higher-risk agents in the database. See the full comparison matrix for context against all tracked agents.