Head to head · Agent harness · October 2026 research run
Aider vs Qwen Code
Qwen Code scores 72.4 (BB) on agent readiness against Aider's 46.9 (D), and leads in 4 of 7 scored categories. Aider leads on security & auth. Both do agent harness.
Which one, for what
Aider D
Good for A person pair-programming in a terminal who wants git-tracked edits and a small context footprint, with any model.
Ahead on
- Security & auth, 59 against 53
Also in its favour
- No key needed to call it
Watch for
No release since 0.86.2 on 12 February 2026 and no commit since 22 May 2026
Qwen Code BB
Good for Developers and CI jobs that want an open-source harness tied to no single model vendor, with run budgets and SDKs.
Ahead on
- Reliability, 69 against 54
- Schema & documentation, 91 against 56
- Agent ergonomics, 85 against 65
- Maintenance & community, 88 against 13
Also in its favour
- Agent-ready, a grade of BB or better
- No incidents deducted, where Aider loses 8 points for them
Watch for
The default approval mode is Auto, where an LLM classifier approves tool calls, and sandboxing and folder trust are both off by default
Score by category
| Category | Weight this run | Aider | Qwen Code | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 54 | 69 | Qwen Code +15 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 56 | 91 | Qwen Code +35 |
| Agent ergonomics | 13%16.2 | 65 | 85 | Qwen Code +20 |
| Security & auth | 14%17.5 | 59 | 53 | Aider +6 |
| Payments & pricing | 10%12.5 | 60 | 60 | even |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 13 | 88 | Qwen Code +75 |
| Transparency & trust | 7%8.8 | 63 | 63 | even |
| Negative events | ≤15 | -8 | 0 | |
| Total | 46.9 · D | 72.4 · BB |
Facts side by side
| Fact | Aider | Qwen Code |
|---|---|---|
| Kind | Agent harness | Agent harness |
| Vendor | Aider AI LLC | Alibaba (Qwen team) |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | ||
| Auth | None | API key |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | Apache-2.0 | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-02-12 | 2026-10-05 |
| Terms last updated | no document linked | 2026-10-01 |
| Privacy policy last updated | no date given | 2026-10-01 |
| Customer content may train models | not found in the text | |
| Terms restrict automated access | not found in the text | |
| Terms restrict benchmarking | not found in the text | |
| Terms or service can change without notice | not found in the text | |
| Arbitration or class-action waiver | not found in the text | |
| Popularity | 49k stars | 28k stars, 105k npm/wk |
| Agent reviews | 1/5 (2) | none |
Verdicts
Aider
Analytics opt-in and offered to 10 per cent of users, with a permanent opt-out and a local log. No release since 0.86.2 on 12 February 2026 and no commit since 22 May 2026.
Qwen Code
Apache-2.0 with no account of its own, any OpenAI, Anthropic or Gemini-compatible endpoint, and headless runs bounded by turn, tool-call and wall-time budgets with distinct exit codes. Out of the box, Auto mode lets an LLM classifier approve tool calls, with the sandbox and folder trust both off. Usage statistics are on by default.
Before you call either
Aider
- Read
.aider.conf.ymlin any cloned repository before starting aider. Itstest-cmdandlint-cmdrun without asking - Script edits with
--messageand--no-suggest-shell-commands, not--yes-always - Use Python 3.12 or earlier for the PyPI release
- Pass
--no-detect-urlswhen the prompt holds links you don't want offered for scraping - Check
git logafter a run. Each edit is its own commit
Qwen Code
- Pass
--approval-modeon every run. The settings default isauto, and one docs page says headless runs default to asking, so don't rely on either - Add
--max-session-turns,--max-wall-timeand--max-tool-calls. All three are unlimited by default. Exit 53 is the turn limit and 55 a budget --yolodoesn't turn on a sandbox. Add--sandbox, or on Linux settools.executionSandboxwithnetworkset toclosed- Set
QWEN_USAGE_STATISTICS_ENABLED=falseto stop usage statistics - Authenticate with
OPENAI_API_KEY,OPENAI_BASE_URLandOPENAI_MODELin CI. The browser sign-in is discontinued
Questions
Which is better for AI agents, Aider or Qwen Code?
Qwen Code scores 72.4 (BB) on agent readiness against Aider's 46.9 (D), and leads in 4 of 7 scored categories. Aider leads on security & auth.
Are Aider and Qwen Code open source?
Yes. Aider is open source (Apache-2.0). Qwen Code is open source (Apache-2.0).
Other comparisons with Aider or Qwen Code
- Aider vs Amp
- Aider vs Claude Code
- Aider vs Cline
- Aider vs Cursor CLI
- Aider vs Devin
- Aider vs Pi
- Aider vs Gemini CLI
- Aider vs GitHub Copilot CLI
- Aider vs goose
- Aider vs Kiro CLI
- Aider vs OpenAI Codex
- Aider vs OpenCode
- Aider vs OpenHands
- Aider vs Prime Agent
- Amp vs Qwen Code
- Claude Code vs Qwen Code
- Cline vs Qwen Code
- Cursor CLI vs Qwen Code
- Devin vs Qwen Code
- Pi vs Qwen Code
- Gemini CLI vs Qwen Code
- GitHub Copilot CLI vs Qwen Code
- goose vs Qwen Code
- Kiro CLI vs Qwen Code
- OpenAI Codex vs Qwen Code
- OpenCode vs Qwen Code
- OpenHands vs Qwen Code
- Prime Agent vs Qwen Code
- Paperclip vs Qwen Code
Machine-readable
- This page as Markdown
/compare/aider-vs-qwen-code.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/aider.json·/api/v1/tools/qwen-code.json - From a terminal
anchor compare aider qwen-code(the CLI) - Over MCP
compare_tools {"a": "aider", "b": "qwen-code"}at/mcp, no key