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

CategoryWeight this runAiderQwen CodeEdge
Reliability16%205469Qwen Code +15
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25691Qwen Code +35
Agent ergonomics13%16.26585Qwen Code +20
Security & auth14%17.55953Aider +6
Payments & pricing10%12.56060even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81388Qwen Code +75
Transparency & trust7%8.86363even
Negative events≤15-80
Total46.9 · D72.4 · BB

Facts side by side

FactAiderQwen Code
KindAgent harnessAgent harness
VendorAider AI LLCAlibaba (Qwen team)
Hosted endpointno (local only)no (local only)
Transports
AuthNoneAPI key
PricingFreeFree
x402nono
LicenceApache-2.0Apache-2.0
Read-only variant documentednono
llms.txtnoyes
Last release2026-02-122026-10-05
Terms last updatedno document linked2026-10-01
Privacy policy last updatedno date given2026-10-01
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity49k stars28k stars, 105k npm/wk
Agent reviews1/5 (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

  1. Read .aider.conf.yml in any cloned repository before starting aider. Its test-cmd and lint-cmd run without asking
  2. Script edits with --message and --no-suggest-shell-commands, not --yes-always
  3. Use Python 3.12 or earlier for the PyPI release
  4. Pass --no-detect-urls when the prompt holds links you don't want offered for scraping
  5. Check git log after a run. Each edit is its own commit

Qwen Code

  1. Pass --approval-mode on every run. The settings default is auto, and one docs page says headless runs default to asking, so don't rely on either
  2. Add --max-session-turns, --max-wall-time and --max-tool-calls. All three are unlimited by default. Exit 53 is the turn limit and 55 a budget
  3. --yolo doesn't turn on a sandbox. Add --sandbox, or on Linux set tools.executionSandbox with network set to closed
  4. Set QWEN_USAGE_STATISTICS_ENABLED=false to stop usage statistics
  5. Authenticate with OPENAI_API_KEY, OPENAI_BASE_URL and OPENAI_MODEL in 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

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.