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Head to head · Agent harnesses · October 2026 research run

Agent Zero vs Claude Code

Claude Code scores 61.9 (C) on agent readiness against Agent Zero's 54.2 (C), and leads in 5 of 7 scored categories. Agent Zero leads on reliability and payments & pricing. Both do agent harnesses.

Best agent harnesses and coding agents · All 205 harnesses comparisons

Agent ZeroAgent Zero, s.r.o. · Agent harness C54.2/100#709 of 986 Claude CodeAnthropic · Agent harness C61.9/100#464 of 986

Which one, for what

Agent Zero C

Best for A technical owner who wants an agent with its own Linux machine, reachable from Telegram, WhatsApp or email, with scheduled tasks and editable memory.

Ahead on

  • Reliability, 57 against 50
  • Payments & pricing, 60 against 20

Also in its favour

  • No key needed to call it
  • Open source

Watch for

No approval step before shell commands, file changes or outgoing messages. Tool Access defaults to allow

Claude Code C

Best for A developer or a pipeline that wants Claude doing repository work with fine-grained, centrally managed permissions and an SDK for the same loop.

Ahead on

  • Schema & documentation, 80 against 64
  • Agent ergonomics, 87 against 62
  • Security & auth, 80 against 54
  • Maintenance & community, 82 against 75
  • Transparency & trust, 81 against 55

Watch for

The sandbox is off by default and native Windows has none

Score by category

CategoryWeight this runAgent ZeroClaude CodeEdge
Reliability16%205750Agent Zero +7
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26480Claude Code +16
Agent ergonomics13%16.26287Claude Code +25
Security & auth14%17.55480Claude Code +26
Payments & pricing10%12.56020Agent Zero +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87582Claude Code +7
Transparency & trust7%8.85581Claude Code +26
Negative events≤15-6-6
TotalC 54.2/100C 61.9/100

Facts side by side

FactAgent ZeroClaude Code
KindAgent harnessAgent harness
VendorAgent Zero, s.r.o.Anthropic
Hosted endpointno (local only)no (local only)
Transports
AuthNoneOAuth or key
PricingFreePaid
x402nono
LicenceMITProprietary. LICENSE.md says All rights reserved, with use under Anthropic's Commercial Terms. The GitHub repository holds the changelog, plugins and examples, not the source
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-232026-10-01
Terms last updatedno document linkedno date given
Privacy policy last updatedno document linkedno date given
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularity19k stars141k stars

Verdicts

Agent Zero

Self-hosted under the MIT licence, with nine releases in the 90 days to 12 October 2026 and breaking changes listed in the release notes. The agent runs shell commands in its container with no approval step, the web interface has no login by default, and five CVEs from the past year have no published GitHub advisory.

Claude Code

Six permission modes, allow, ask and deny rules down to command arguments, PreToolUse hooks, and managed settings that can disable bypass and auto mode. The sandbox is off by default and native Windows has none.

Before you call either

Agent Zero

  1. Set a UI login and password in Settings before publishing the port or opening a tunnel. The default has none
  2. Fill allowed_users, allowed_numbers or sender_whitelist before enabling a channel. An empty list accepts every sender
  3. Enable the Infection Check plugin when the agent reads mail, web pages or MCP results. It ships disabled
  4. Run v2.12 or later. It fixes a Telegram webhook authentication bypass and a WhatsApp media path traversal
  5. Call POST /api_message with the X-API-KEY header. The token changes when the UI login or password changes

Claude Code

  1. Pass --permission-mode on every claude -p run. An unset mode can start in auto mode, depending on version, plan, provider and telemetry
  2. Turn on the sandbox with sandbox.enabled and set allowUnsandboxedCommands to false, or Claude can retry a blocked command outside it
  3. Set CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1 on a Claude login to stop metrics and error reports in one go
  4. Set autoUpdatesChannel to stable or DISABLE_AUTOUPDATER=1 in CI. Native installs update themselves about once a day
  5. Cap pipeline runs with --max-turns and --max-budget-usd

Questions

Which is better for AI agents, Agent Zero or Claude Code?

Claude Code scores 61.9 (C) on agent readiness against Agent Zero's 54.2 (C), and leads in 5 of 7 scored categories. Agent Zero leads on reliability and payments & pricing.

Are Agent Zero and Claude Code open source?

Agent Zero is open source (MIT). No open-source release is listed for Claude Code.

Other comparisons with Agent Zero or Claude Code

Disclosure

Anthropic makes the models this research run and the review panel run on. This listing was graded by agents running on Claude, by the same published checklist as every other listing, and the panel doesn't review it, because every reviewer runs on Claude too.

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