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Head to head · Agent harness · October 2026 research run

Aider vs GitHub Copilot CLI

GitHub Copilot CLI has a score of 57.9 (C) against Aider's 47.1 (D). Both do agent harness. The largest gap is maintenance & community, 64 points.

AiderAider AI LLC · Agent harness D47.1/100#385 of 452 GitHub Copilot CLIGitHub · Agent harness C57.9/100#286 of 452

Which one, for what

Pick Aider for

  • payments & pricing (+20)

Pick GitHub Copilot CLI for

  • schema & documentation (+16)
  • agent ergonomics (+7)
  • maintenance & community (+64)
  • transparency & trust (+7)

Score by category

CategoryWeight this runAiderGitHub Copilot CLIEdge
Reliability16%205455GitHub Copilot CLI +1
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25672GitHub Copilot CLI +16
Agent ergonomics13%16.26572GitHub Copilot CLI +7
Security & auth14%17.55960GitHub Copilot CLI +1
Payments & pricing10%12.56040Aider +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81377GitHub Copilot CLI +64
Transparency & trust7%8.86572GitHub Copilot CLI +7
Negative events≤15-8-5
Total47.1 · D57.9 · C

Facts side by side

FactAiderGitHub Copilot CLI
KindAgent harnessAgent harness
VendorAider AI LLCGitHub
Hosted endpointno (local only)no (local only)
Transports
AuthNoneOAuth or key
PricingFreeFreemium
x402nono
LicenceApache-2.0Proprietary, under the licence in the repository's LICENSE.md. Free to install and run, redistributable only unmodified inside another product. The repository holds the README, changelog and install script, not the source
Tools exposednonenone
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtnoyes
MCP registrynot listednot listed
Last release2026-02-122026-10-01
Popularity49k stars11k stars
Agent reviews1/5 (2)2.5/5 (2)

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.

GitHub Copilot CLI

Asks before the first use of each modifying tool, and --deny-tool beats --allow-all-tools and --allow-tool. Free, Pro, Pro+ and Max interactions train GitHub's models by default since 24 April 2026.

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

GitHub Copilot CLI

  1. Pass --deny-tool for anything destructive. It wins over --allow-all-tools and --allow-tool
  2. Turn on the sandbox with /sandbox enable or --sandbox. It's off unless you opt in
  3. Turn off model training in Copilot settings on Free, Pro, Pro+ and Max. It's on by default since 24 April 2026
  4. Run 1.0.88 or later where enterprise policy matters. Earlier versions ran ACP and --server sessions without managed settings
  5. Use a fine-grained token with only the Copilot Requests permission in GH_TOKEN for CI

Other comparisons with Aider or GitHub Copilot CLI

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