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Head to head · Agent harnesses · October 2026 research run

Orca vs Sculptor

Orca scores 57.4 (C) on agent readiness against Sculptor's 53.1 (D), and leads in 3 of 7 scored categories. Sculptor leads on security & auth and payments & pricing. Both do agent harnesses.

Best agent harnesses and coding agents · All 1500 harnesses comparisons

OrcaLovecast Inc. · Agent harness C57.4/100#791 of 1486 SculptorImbue, Inc. · Agent harness D53.1/100#960 of 1486

Which one, for what

Orca C

Best for Developers who want an orchestrator agent to split work across parallel coding agents, on desktop or mobile.

Ahead on

  • Reliability, 58 against 43
  • Schema & documentation, 65 against 45
  • Agent ergonomics, 70 against 50

Watch for

Anonymous usage data collected by default, with an opt-out

Sculptor D

Best for Developers who want parallel coding agents in isolated workspaces and are fine with a research preview.

Ahead on

  • Security & auth, 57 against 43
  • Payments & pricing, 60 against 40

Watch for

Labelled an experimental research preview that may change drastically

Why the edge

Each category where one leads by five points or more, with the reason behind each side's score from its assessment. The numbers are in the table below; this is what they stand for.

Schema & documentation Orca +20

Orca 65

Harness reading. A docs site with CLI orchestration and native chat pages (65).

Sculptor 45

Harness reading. A README, specs and agent docs in the repository; no API reference (45).

Agent ergonomics Orca +20

Orca 70

Harness reading. An orchestrator agent that splits work across workers in their own workspaces, chat or raw CLI, a browser and a CLI in one app (70).

Sculptor 50

Harness reading. Workspaces as isolated copies, review and merge back, and built-in skills (50).

Payments & pricing Sculptor +20

Orca 40

Scored on the cloud option. No protocol (0). The cloud price wasn't found on the pages read (0). The desktop app is free and MIT with no card (20). The local app needs no sign-up that we found (20). 0 + 0 + 20 + 20 = 40.

Sculptor 60

Free self-hosted software with nothing to buy, so 0 for a protocol and 20 each for public pricing, a free tier and onboarding with no sign-up, 60.

Reliability Orca +15

Orca 58

Local software. Desktop and mobile builds and a Homebrew cask (20). Unit, end-to-end and platform test workflows; pass state not read (15). GitHub issues and pull requests weren't read (GitHub's pages refuse these sessions), so that line is scored absent (0). Tags to v1.4.251, no changelog file (8). Version 1.4 (15). 20 + 15 + 0 + 8 + 15 = 58.

Sculptor 43

Local software. Desktop downloads for Mac (Apple Silicon), Linux and Linux ARM64 (20). checks.yml and a PR gate run on the repository; pass state not read (15). GitHub issues and pull requests weren't read (GitHub's pages refuse these sessions), so that line is scored absent (0). sculptor-v tags up to v0.49.0, no changelog file (8). 0.x and labelled a research preview (0). 20 + 15 + 0 + 8 + 0 = 43.

Security & auth Sculptor +14

Orca 43

Harness reading. Anonymous usage data with an opt-out, per the README's link to its telemetry docs (15 of 30). Worktrees per agent and a sandboxed Linux build (12 of 20). No prompt-injection guidance (5). No audit log (5). A dependency-security workflow (6 of 20). 15 + 12 + 5 + 5 + 6 = 43.

Sculptor 57

Harness reading. Product analytics, error reporting and session recording default to off in the user config, and the app asks for a telemetry level and privacy consent at first run; PostHog runs on the front end only for now (25 of 30). Each workspace is an isolated copy of the code (14 of 20). No prompt-injection guidance (5). No audit log (5). SECURITY.md (8). 25 + 14 + 5 + 5 + 8 = 57.

Score by category

CategoryWeight this runOrcaSculptorEdge
Reliability16%205843Orca +15
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26545Orca +20
Agent ergonomics13%16.27050Orca +20
Security & auth14%17.54357Sculptor +14
Payments & pricing10%12.54060Sculptor +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87575even
Transparency & trust7%8.85457Sculptor +3
Negative events≤1500
TotalC 57.4/100D 53.1/100

Facts side by side

FactOrcaSculptor
KindAgent harnessAgent harness
VendorLovecast Inc.Imbue, Inc.
Hosted endpointno (local only)no (local only)
Transports
AuthNoneNone
PricingFreeFree
x402nono
LicenceMITMIT
Read-only variant documentednono
llms.txtnono
Last release2026-11-062026-11-06
Terms last updatedno document linkedno document linked
Privacy policy last updatedno document linkedno document linked

Verdicts

Orca

An open-source orchestrator for coding agents with worker agents in their own worktrees, chat and terminal views, a browser and a CLI, on desktop and mobile, with heavy test automation. It collects anonymous usage data by default, and the cloud option's pricing wasn't found.

Sculptor

Imbue's open-source app for parallel coding agents in isolated workspaces, with telemetry off until you choose otherwise. It's an experimental research preview that warns of bugs and drastic changes, Mac and Linux only, with no changelog.

Before you call either

Orca

  1. See the telemetry docs on onorca.dev to opt out of anonymous usage data
  2. Use the orchestration CLI to hand a large task to one agent that starts workers

Sculptor

  1. Download from the README's links, connect a repository and create a workspace before prompting
  2. Review the diff before merging a workspace back to main

Questions

Which is better for AI agents, Orca or Sculptor?

Orca scores 57.4 (C) on agent readiness against Sculptor's 53.1 (D), and leads in 3 of 7 scored categories. Sculptor leads on security & auth and payments & pricing.

Are Orca and Sculptor open source?

Yes. Orca is open source (MIT). Sculptor is open source (MIT).

Other comparisons with Orca or Sculptor

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