Error rate by coding agent, April 2026

Error rate by coding agent, April 2026

Percentage of API calls that returned an error (non-200 status). Lower is better.

Aider

0.90%

Aider

Error rate: 0.90%

Success rate: 99%

1.7K calls

Roo Code

2.5%

Roo Code

Error rate: 2.5%

Success rate: 98%

147K calls

OpenCode

3.1%

OpenCode

Error rate: 3.1%

Success rate: 97%

173K calls

Zed

3.7%

Zed

Error rate: 3.7%

Success rate: 96%

4.5K calls

Cline

4.9%

Cline

Error rate: 4.9%

Success rate: 95%

28K calls

Claude Code

7.0%

Claude Code

Error rate: 7.0%

Success rate: 93%

494K calls

Kilo Code

10%

Kilo Code

Error rate: 10%

Success rate: 90%

23K calls

Forge

11%

Forge

Error rate: 11%

Success rate: 89%

1.1K calls

How reliable are AI coding agents? In April 2026, Roo Code leads with a 2.5% error rate across 147K calls. Claude Code sits at 7.0% across 494K calls. Forge trails at 11.2% across 1.1K calls. Kilo Code shows 10.0% error rate across 23K calls.

Why it mattersError rates directly impact developer productivity. Roo Code's 2.5% error rate means fewer than 1 in 40 calls fails. The spread across agents points to structural differences in how agents construct and retry API requests.

Requesty (2026). Error rate by coding agent, April 2026. Requesty Data. https://requesty.ai/data/coding-agent-error-rate-apr-2026

@misc{requesty_coding_agent_error_rate_apr_2026,
  author       = {{Requesty}},
  title        = {Error rate by coding agent, April 2026},
  year         = {2026},
  howpublished = {\url{https://requesty.ai/data/coding-agent-error-rate-apr-2026}},
  note         = {Requesty Data}
}