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Head to head · Agent harness · October 2026 research run

Aider vs Prime Agent

Prime Agent scores 60.5 (C) on agent readiness against Aider's 46.9 (D), and leads in 4 of 7 scored categories. Aider leads on schema & documentation and security & auth. Both do agent harness.

AiderAider AI LLC · Agent harness D46.9/100#502 of 578 Prime AgentPrime Intellect · Agent harness C60.5/100#317 of 578

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

  • Schema & documentation, 56 against 42
  • Security & auth, 59 against 50

Watch for

No release since 0.86.2 on 12 February 2026 and no commit since 22 May 2026

Prime Agent C

Good for Long-running research and coding work where one model drives subagents, schedules and goals from code, and where the owner can isolate the machine.

Ahead on

  • Reliability, 65 against 54
  • Agent ergonomics, 73 against 65
  • Maintenance & community, 79 against 13

Also in its favour

  • No incidents deducted, where Aider loses 8 points for them

Watch for

No approval prompts and no sandbox. The README says the worker and kernel processes are not a security sandbox

Score by category

CategoryWeight this runAiderPrime AgentEdge
Reliability16%205465Prime Agent +11
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25642Aider +14
Agent ergonomics13%16.26573Prime Agent +8
Security & auth14%17.55950Aider +9
Payments & pricing10%12.56060even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81379Prime Agent +66
Transparency & trust7%8.86364Prime Agent +1
Negative events≤15-80
Total46.9 · D60.5 · C

Facts side by side

FactAiderPrime Agent
KindAgent harnessAgent harness
VendorAider AI LLCPrime Intellect
Hosted endpointno (local only)no (local only)
Transports
AuthNoneNone
PricingFreeFree
x402nono
LicenceApache-2.0MIT
Read-only variant documentednono
llms.txtnono
Last release2026-02-122026-10-07
Terms last updatedno document linkedno date given
Privacy policy last updatedno date givenno date given
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity49k stars22k stars
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.

Prime Agent

Budgets for turns, tokens and time bound an autonomous run, and sessions survive a closed terminal through a supervising daemon. Model-written Python and shell commands run with the user's rights, with no approval step and no sandbox, and the Rust build on the main branch ships only as nightly betas.

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

Prime Agent

  1. Run it in a disposable clone, container or VM. It executes model-written Python and shell commands with the user's rights and asks nothing first
  2. Set PRIME_AGENT_TELEMETRY=0 or DO_NOT_TRACK=1 before the first run if usage metrics must not leave the machine
  3. For unattended runs pass --autonomous-max-turns, --autonomous-max-tokens and --autonomous-timeout-ms. Reaching a limit does not mean the task succeeded
  4. Headless use is -p with --mode json per the argument parser. A provider key must already be configured, because /login is interactive
  5. The -t/--tools, -nt/--no-tools and -nbt/--no-builtin-tools flags were removed and now fail as unknown options

Questions

Which is better for AI agents, Aider or Prime Agent?

Prime Agent scores 60.5 (C) on agent readiness against Aider's 46.9 (D), and leads in 4 of 7 scored categories. Aider leads on schema & documentation and security & auth.

Are Aider and Prime Agent open source?

Yes. Aider is open source (Apache-2.0). Prime Agent is open source (MIT).

Other comparisons with Aider or Prime Agent

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