Previous edition: Error rate by coding agent, April 2026
Error rate by coding agent, October 2026
Error rate by coding agent, October 2026
Percentage of API calls that returned an error (non-200 status). Lower is better.
In October 2026 Cursor had the lowest error rate at 1.0% of calls, and Qwen Code the highest at 10.9%.
Which coding agents see the fewest API errors? In October 2026 Cursor had the lowest error rate at 1.0% of calls, and Qwen Code the highest at 10.9%.
Why it mattersError rates reflect the models and providers each agent picks as much as the agent itself. Agents that pin a single busy provider see more rate limits.
Period
Oct 2026
Updated
November 11, 2026
ID
coding-agent-error-oct26
§ 01
Key findings
- 01Cursor: 1.0%.
- 02OpenCode: 2.1%.
- 03Zoo Code: 2.3%.
- 04Claude Code: 8.1%.
- 05Qwen Code: 10.9%.
§ 01b
Questions this answers
- Which coding agent has the lowest error rate?
- How often do coding agent API calls fail?
- Why does Claude Code see more errors?
§ 02
Data
| Agent | Error rate(percent) |
|---|---|
| Cursor | 1.00% |
| OpenCode | 2.14% |
| Zoo Code | 2.30% |
| GitHub Copilot | 2.40% |
| Zed | 2.61% |
| Hermes Agent | 2.81% |
| Roo Code | 2.95% |
| Pi | 3.74% |
| Kilo Code | 5.73% |
| Cline | 6.83% |
| Claude Code | 8.05% |
| Qwen Code | 10.92% |
§ 03
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ID: coding-agent-error-oct26·Updated November 11, 2026·Period Oct 2026