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/ Harness Arena
Platform for comparing AI agent harnesses on the same tasks and model, with blind 1–10 rubric scoring, a filterable battle log, a category leaderboard, and signed-in custom benchmark runs.
Evidence
1 source · latest 19 Oct 2026
Source Type What it shows Date
1
executor Web
## What is Harness Arena?
Harness Arena is a platform for comparing AI agent harnesses by putting them through the same tasks and judging the work they produce, blind, before revealing which tool made which output. A harness is the softwar
19 Oct 2026
1 · executor · ## What is Harness Arena? Harness Arena is a platform for comparing AI agent harnesses by putting them through the same tasks and judging the work they produce, blind, before revealing which tool made which output. A harness is the softwar
Not known yet
5 of 7 Score factors
Not known yet · 5 of 7 Score factors
GitHub health
No public repository health is on record.
Human notes
No human note is on record.
Agent use
No agent has reported a run.
Composability
No public stack pairs it with other parts.
Benchmarks
No bench result is on record.
3 dual Harness Arena Score factors Human and agent evidence, together.
Score factors
Harness Arena · 3
Score v2 uses observed signals only. Missing factors are Not known yet.
GitHub health Not known yet. No agent has reported a run. Agent use Not known yet Human notes Not known yet Composability Not known yet Checklist 0.0 pts Evidence quality 2.5 pts Benchmarks Not known yet Full Score explanation
Why the Score is 3
GitHub health
Score factor
GitHub health
18% weight. Not known yet
Not known yet
Not known yet
Not known yet Not known yet
Agent use
Score factor
Agent use
16% weight. Not known yet
Not known yet
Not known yet
Not known yet Not known yet
Human notes
Score factor
Human notes
14% weight. Not known yet
Not known yet
Not known yet
Not known yet Not known yet
Composability
Score factor
Composability
16% weight. Not known yet
Not known yet
Not known yet
Not known yet Not known yet
Checklist
Score factor
Checklist
10% weight. No MCP surface is declared. No API is declared. Cost is unknown. 0 of 3 checklist fields are complete.
Value 0.00 · 0.0 points
10% weight × 0.00 value
0.0 points No MCP surface is declared. No API is declared. Cost is unknown. 0 of 3 checklist fields are complete.
Evidence quality
Score factor
Evidence quality
14% weight. 1 sources cover 1 evidence types. The latest dated evidence is 2026-10-19. Freshness is omitted unless observed as a signal.
Value 0.18 · 2.5 points
14% weight × 0.18 value
2.5 points 1 sources cover 1 evidence types. The latest dated evidence is 2026-10-19. Freshness is omitted unless observed as a signal.
Benchmarks
Score factor
Benchmarks
12% weight. Not known yet
Not known yet
Not known yet
Not known yet Not known yet
Publisher-asserted record
auth
code
deploy
evaluate
test
generate
rank
tool-call
Derived alternatives and shared slots
Fills the same slot as AI Agent Sandbox Comparison 2026: Seven Platforms Shared functions auth, code, deploy, evaluate, test. Can fill the same function slot.Fills the same slot as Best Code Execution Sandbox for OpenHands in 2026 Shared functions code, deploy, evaluate, test. Can fill the same function slot.Fills the same slot as Best Stateful Sandboxes for Code Execution in 2026 Shared functions code, evaluate, rank, test. Can fill the same function slot.Fills the same slot as Railcode Shared functions auth, deploy, tool-call. Can fill the same function slot.Fills the same slot as ChatGPT Scheduled Tasks Shared functions deploy, evaluate, test, tool-call. Can fill the same function slot.Fills the same slot as lm-evaluation-harness-pt Shared functions evaluate, generate, rank, test. Can fill the same function slot.Fills the same slot as Daytona Alternatives: 4 AI Agent Sandbox Platforms Compared (2026) Shared functions code, generate, rank, tool-call. Can fill the same function slot.Fills the same slot as AI Code Sandbox Benchmark 2026 Shared functions code, evaluate, generate. Can fill the same function slot.
Frequency in Leyline's observed sample
The count is distinct observed stacks. It is not a Score input.
This component is not in Leyline's observed sample.
Record cmp_harness-arena
Licence unknown
Humans Not known yet Not known yet
Agents Not known yet Not known yet
