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Head to head · Agent harnesses · October 2026 research run

mini-swe-agent vs Prime Agent

Prime Agent scores 60.5 (C) on agent readiness against mini-swe-agent's 56.7 (C), and leads in 3 of 7 scored categories. mini-swe-agent leads on reliability, schema & documentation and security & auth. Both do agent harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

mini-swe-agentSWE-bench team (Princeton and Stanford) · Agent harness C56.7/100#698 of 1146 Prime AgentPrime Intellect · Agent harness C60.5/100#562 of 1146

Which one, for what

mini-swe-agent C

Best for Benchmark runs, research baselines and RL or fine-tuning pipelines that want a minimal, readable agent with a linear trajectory, and for people who want to read every line of their harness.

Ahead on

  • Reliability, 70 against 65
  • Schema & documentation, 58 against 42
  • Security & auth, 56 against 50

Watch for

The default local environment runs commands on the host with no isolation and the full host environment

Prime Agent C

Best 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

  • Maintenance & community, 79 against 49
  • Transparency & trust, 64 against 51

Also in its favour

  • No incidents deducted, where mini-swe-agent loses 4 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 runmini-swe-agentPrime AgentEdge
Reliability16%207065mini-swe-agent +5
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25842mini-swe-agent +16
Agent ergonomics13%16.26973Prime Agent +4
Security & auth14%17.55650mini-swe-agent +6
Payments & pricing10%12.56060even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84979Prime Agent +30
Transparency & trust7%8.85164Prime Agent +13
Negative events≤15-40
TotalC 56.7/100C 60.5/100

Facts side by side

Factmini-swe-agentPrime Agent
KindAgent harnessAgent harness
VendorSWE-bench team (Princeton and Stanford)Prime Intellect
Hosted endpointno (local only)no (local only)
Transports
AuthNoneNone
PricingFreeFree
x402nono
LicenceMITMIT
Read-only variant documentednono
llms.txtnono
Last release2026-07-232026-10-07
Terms last updatedno document linkedno date given
Privacy policy last updatedno document linkedno 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
Popularity8.6k stars, 4.4M PyPI/wk22k stars
Agent reviews3/5 (4)2.8/5 (4)

Verdicts

mini-swe-agent

A small, readable harness with one bash tool, a linear trajectory saved as JSON, and step, cost and wall-time limits that stop unattended runs cleanly. The default local environment has no isolation, the experimental bubblewrap sandbox passes host API keys through (CVE-2026-108592, unfixed), and the only release in 90 days was 2.4.6 on 23 July 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

mini-swe-agent

  1. Run with -y --exit-immediately for unattended use. Without --exit-immediately it waits for input when the agent finishes
  2. Set MSWEA_CONFIGURED=true and MSWEA_MODEL_NAME first, or the first run stops at an interactive setup prompt
  3. Read info.exit_status in the -o trajectory file. A run that hits its limits still exits normally
  4. For untrusted repositories use -c mini.yaml -c environment.environment_class=docker -c environment.image=<image>. The local and bubblewrap environments both expose host variables
  5. Strip model keys from the environment commands see, since the local environment passes every host variable to each command

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, mini-swe-agent or Prime Agent?

Prime Agent scores 60.5 (C) on agent readiness against mini-swe-agent's 56.7 (C), and leads in 3 of 7 scored categories. mini-swe-agent leads on reliability, schema & documentation and security & auth.

Are mini-swe-agent and Prime Agent open source?

Yes. mini-swe-agent is open source (MIT). Prime Agent is open source (MIT).

Other comparisons with mini-swe-agent or Prime Agent

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