---
id: coding-agent-error-apr26
slug: coding-agent-error-rate-apr-2026
title: "Error rate by coding agent, April 2026"
topic: reliability
period: Apr 2026
updated: 2026-05-16
license: CC BY 4.0
canonical: https://requesty.ai/data/coding-agent-error-rate-apr-2026
---

# Error rate by coding agent, April 2026

> 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.

*Topic: Reliability and ops. Period: Apr 2026. Last updated 2026-05-16.*

## Why it matters

Error 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.

## Questions this answers

- Which coding agent has the lowest error rate?
- How reliable is Claude Code compared to other coding agents?
- What is the typical error rate for AI coding tools?

## Key findings

1. Roo Code: 2.5% error rate. The most reliable coding agent by a significant margin.
2. OpenCode: 3.1% error rate. Strong reliability despite rapid growth.
3. Claude Code: 7.0% error rate. Acceptable but higher than Roo Code, possibly due to more aggressive retry patterns.
4. Kilo Code: 10.0% error rate.
5. Forge: 11.2% error rate. The highest among agents with sufficient sample size.

## Data

| Agent | Error rate (percent) |
| --- | --- |
| Aider | 0.90% |
| Roo Code | 2.50% |
| OpenCode | 3.10% |
| Zed | 3.70% |
| Cline | 4.90% |
| Claude Code | 7.00% |
| Kilo Code | 10.00% |
| Forge | 11.20% |

## Caveats

- Error rate includes all non-200 HTTP status codes. Some "errors" may be expected behavior (e.g. rate limiting that triggers a retry).
- Agents with very low traffic (Cursor, GitHub Copilot, Codex CLI) are excluded due to insufficient sample size.
- Error rate does not distinguish between client-side errors (4xx) and server-side errors (5xx).

## Cite as

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

```bibtex
@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}
}
```

---

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