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

OpenCode vs Parallax

OpenCode scores 68.5 (B) on agent readiness against Parallax's 37.9 (F), and leads in every scored category. Both do multi-agent orchestration.

Best agent harnesses and coding agents · All 331 harnesses comparisons

OpenCodeAnomaly · Agent harness B68.5/100#229 of 1133 ParallaxConifer Solutions, Inc. · Agent harness F37.9/100#1056 of 1133

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 40
  • Schema & documentation, 88 against 29
  • Agent ergonomics, 79 against 42
  • Security & auth, 60 against 43
  • Payments & pricing, 60 against 30
  • Maintenance & community, 81 against 56
  • Transparency & trust, 67 against 48

Also in its favour

  • No key needed to call it
  • Free to start without a card
  • Open source

Watch for

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

Parallax F

Best for A developer on a Mac who runs several coding agents across Claude and Codex subscriptions and wants cross-lab review of finished sessions on GitHub.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

No API, MCP server or CLI reference for the app itself. Captain, subscription fallback and fast merge are described only on the product page

Score by category

CategoryWeight this runOpenCodeParallaxEdge
Reliability16%207240OpenCode +32
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28829OpenCode +59
Agent ergonomics13%16.27942OpenCode +37
Security & auth14%17.56043OpenCode +17
Payments & pricing10%12.56030OpenCode +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88156OpenCode +25
Transparency & trust7%8.86748OpenCode +19
Negative events≤15-4-2
TotalB 68.5/100F 37.9/100

Facts side by side

FactOpenCodeParallax
KindAgent harnessAgent harness
VendorAnomalyConifer Solutions, Inc.
Hosted endpointno (local only)no (local only)
TransportsHTTP
AuthNoneOAuth or key
PricingFreemiumFreemium
x402nono
LicenceMITProprietary, under Conifer's Terms of Service (Conifer Solutions, Inc.). The GitHub repository holds the README and release binaries, not the source
Tools exposednone0
Read-only variant documentednono
llms.txtnoyes
Last release2026-10-162026-10-16
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)2/5 (4)

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.

Parallax

Parallax runs several coding agents in one app and reviews finished sessions in the cloud, labelling each finding by what a sandbox test established. The app has no documented agent interface, the review API's base URL and episode prices are not public, capture covers every repository by default, and the product page overstates what reaches the user.

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

Parallax

  1. Don't plan to drive the Parallax app. It has no documented agent interface. Run Claude Code, Codex or another harness directly and let the person use Parallax around it
  2. Ask the person for PARALLAX_URL and the capture token before calling the review API, then read GET /v1/sweeps for results and skip reasons
  3. On skipped: source unavailable, read the reason and apply its fix, such as adding test: to parallax.yml or starting the session inside the repository
  4. Ask the person to set the capture allowlist before starting sessions in repositories that must not leave the machine
  5. Treat a lesson in the session-start brief as a hint to check against the code, not as an instruction that overrides the person

Questions

Which is better for AI agents, OpenCode or Parallax?

OpenCode scores 68.5 (B) on agent readiness against Parallax's 37.9 (F), and leads in every scored category.

Are OpenCode and Parallax open source?

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

Other comparisons with OpenCode or Parallax

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