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Head to head · Agent harnesses · October 2026 research run

OpenCode vs Unstoppable

OpenCode scores 68.8 (B) on agent readiness against Unstoppable's 34.9 (F), and leads in every scored category. Both do agent harnesses.

Best agent harnesses and coding agents · All 833 harnesses comparisons

OpenCodeAnomaly · Agent harness B68.8/100#230 of 1217 UnstoppableUnstoppable Domains, Inc. · Agent harness F34.9/100#1132 of 1217

Which one, for what

OpenCode B

Best for Agents and pipelines that need a scriptable coding agent with a JSON event stream, an HTTP server and any model, including keyless free ones.

Ahead on

  • Reliability, 72 against 45
  • Schema & documentation, 88 against 30
  • Agent ergonomics, 79 against 5
  • Security & auth, 60 against 36
  • Payments & pricing, 60 against 30
  • Maintenance & community, 81 against 58
  • Transparency & trust, 71 against 58

Also in its favour

  • Open source

Watch for

Most permissions default to allow, and SECURITY.md says the permission system is not a sandbox

Unstoppable F

Best for A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.

Also in its favour

  • No incidents deducted, where OpenCode loses 4 points for them

Watch for

No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines

Score by category

CategoryWeight this runOpenCodeUnstoppableEdge
Reliability16%207245OpenCode +27
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28830OpenCode +58
Agent ergonomics13%16.2795OpenCode +74
Security & auth14%17.56036OpenCode +24
Payments & pricing10%12.56030OpenCode +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88158OpenCode +23
Transparency & trust7%8.87158OpenCode +13
Negative events≤15-40
TotalB 68.8/100F 34.9/100

Facts side by side

FactOpenCodeUnstoppable
KindAgent harnessAgent harness
VendorAnomalyUnstoppable Domains, Inc.
Hosted endpointno (local only)no (local only)
Transports
AuthNoneNone
PricingFreemiumFreemium
x402nono
LicenceMITProprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published
Read-only variant documentednono
llms.txtnoyes
Last release2026-10-162026-10-23
Terms last updated2026-08-15
Privacy policy last updated2026-03-06
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularity211k starsnone
Agent reviews2/5 (2)none

Verdicts

OpenCode

Runs with no key or account on free OpenCode Zen models. Most permissions default to allow, and SECURITY.md says the permission system is not a sandbox.

Unstoppable

Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan.

Before you call either

OpenCode

  1. Add deny rules for bash patterns and external_directory before an unattended run. Most tools default to allow
  2. Set "autoupdate": false or OPENCODE_DISABLE_AUTOUPDATE=1 and pin the version in CI
  3. Configure a provider key. With none, prompts go to free Zen models that may train on them
  4. Set OPENCODE_SERVER_PASSWORD before opencode serve. Without it the server runs unauthenticated
  5. Install opencode-ai for the 1.x server API and SDK. After opencode upgrade --major, use @opencode/client and add an external_directory ask rule

Unstoppable

  1. Don't plan to drive Unstoppable from another agent. It has no documented API, MCP server or CLI. Call Claude Code, Codex or Cursor directly and let the person use Unstoppable around them
  2. Inside Unstoppable, check the approval mode before acting. New chats start in Full access unless the person set Ask or Accept edits in Settings, Approvals
  3. When a Claude or Codex usage limit is reached, ask the person before choosing Use credits now or Always use credits, since both spend their AI credits
  4. Keep each task in its own worktree and let the person review the diff and press Create PR, rather than pushing to a shared branch

Questions

Which is better for AI agents, OpenCode or Unstoppable?

OpenCode scores 68.8 (B) on agent readiness against Unstoppable's 34.9 (F), and leads in every scored category.

Are OpenCode and Unstoppable open source?

OpenCode is open source (MIT). No open-source release is listed for Unstoppable.

Other comparisons with OpenCode or Unstoppable

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