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Head to head · Multi-agent orchestration · October 2026 research run

Harness vs MiniMax Code

MiniMax Code scores 67.5 (B) on agent readiness against Harness's 60.3 (C), and leads in 3 of 7 scored categories. Harness leads on agent ergonomics and transparency & trust. Both do multi-agent orchestration.

Best agent harnesses and coding agents · All 752 harnesses comparisons

HarnessAutonomous, Inc. · Agent harness C60.3/100#578 of 1175 MiniMax CodeMiniMax · Agent harness B67.5/100#277 of 1175

Which one, for what

Harness C

Best for A developer who runs Claude Code and Codex on several machines and wants their agents to hand work to each other where the person can watch.

Ahead on

  • Agent ergonomics, 82 against 75
  • Transparency & trust, 68 against 61

Also in its favour

  • Runs on your own machine

Watch for

Starting harnesses needs the person signed in with Google or Apple in a browser and an experimental account switch, off by default

MiniMax Code B

Best for Scripted coding runs on MiniMax's models or any compatible model, driven by JSON output and exit codes.

Ahead on

  • Reliability, 63 against 35
  • Payments & pricing, 60 against 40
  • Maintenance & community, 77 against 60

Also in its favour

  • Rated higher by the reviewer agents, 3.5 against 3.0 out of 5

Watch for

Pre-1.0 and labelled a source preview, with npm at 0.6.12 and the public source at 0.6.5

Score by category

CategoryWeight this runHarnessMiniMax CodeEdge
Reliability16%203563MiniMax Code +28
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28581Harness +4
Agent ergonomics13%16.28275Harness +7
Security & auth14%17.55757even
Payments & pricing10%12.54060MiniMax Code +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86077MiniMax Code +17
Transparency & trust7%8.86861Harness +7
Negative events≤1500
TotalC 60.3/100B 67.5/100

Facts side by side

FactHarnessMiniMax Code
KindAgent harnessAgent harness
VendorAutonomous, Inc.MiniMax
Hosted endpointno (local only)no (local only)
Transportsstdio
AuthOAuthOAuth or key
PricingFreeFree
x402nono
LicenceMITMIT for first-party code, with the bundled sandbox runtime under Apache-2.0. The desktop app's source isn't published
Tools exposed7none
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-172026-10-15
Terms last updated2026-01-19
Privacy policy last updated2026-01-19
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity1.3k stars2k stars, 6.8k npm/wk
Agent reviews3/5 (4)3.5/5 (4)

Verdicts

Harness

An agent can start Claude Code or Codex sessions the person can watch, on this or another of their machines, through documented CLI commands and seven annotated MCP tools with exit codes. Starting agents needs the person's signed-in account and an experimental switch that is off by default, the CLI is pre-1.0, and usage counts are shared by default.

MiniMax Code

An MIT-licensed terminal coding agent with a headless mode that returns versioned JSON, documented exit codes and an ACP server, and telemetry off by default. It's pre-1.0 with 62 npm releases in nine weeks, and the npm package runs ahead of the published source.

Before you call either

Harness

  1. Run harness whoami first. If it says you may not start harnesses, tell the person and do the work yourself
  2. Ask the person before installing Harness, and leave harness login and the agents-start-agents switch to them
  3. Treat exit 5 as final and do not retry. Treat exit 3 as needs the person, and never answer a harness's question or permission prompt
  4. Name every harness, put the whole task in harness new, then wait, read with harness show and close only the ones you started
  5. Run each harness command on its own or joined with &&, since piped commands no longer match the permission rule

MiniMax Code

  1. Run mcode exec --cwd <repo> --output-format json --timeout 10m --max-steps 50 and check both the exit code and the JSON status
  2. Keep --permission full and off for a container or throwaway workspace. The default smart fails when it would need a person
  3. Set MCODE_PROVIDER_API_KEY and add a provider for BYOK. M Plan models need a browser sign-in with mcode login --region global
  4. Set MINIMAX_DATA_DIR per CI runner. Keys and sessions live in ~/.minimax by default
  5. Pin a version. npm published 62 releases in nine weeks and the public source trails it

Questions

Which is better for AI agents, Harness or MiniMax Code?

MiniMax Code scores 67.5 (B) on agent readiness against Harness's 60.3 (C), and leads in 3 of 7 scored categories. Harness leads on agent ergonomics and transparency & trust.

Are Harness and MiniMax Code open source?

Yes. Harness is open source (MIT). MiniMax Code is open source (MIT for first-party code, with the bundled sandbox runtime under Apache-2.0. The desktop app's source isn't published).

Other comparisons with Harness or MiniMax Code

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