The 11-layer harness vs. a bare model loop

Compare: lookup-capital

Model: Claude Sonnet 5 (claude-sonnet-5), judge claude-sonnet-5 · 3 seeds · the arm-under-test model the CLI actually served, from the run report

Prompt

What is the capital city of Australia?
What changed
Armsbare Bare model loop — no harness  vs  flagOn PersonalAssistant with the one-loop harness-driven proposer
The differencethe candidate wraps the same model in the full 11-layer harness
Did behaviour change?
Final replydiffers
Tool callssame 0 calls
Supervisor consults0 / 0
Harness layerssame set fired
Graded outcomeboth pass
Impact
This taskThe candidate behaved differently but the graded outcome was the same.
Shown seedcost +229% · latency +147% · tokens -75% (candidate vs control, seed 1)

Side by side — control (left) vs candidate (right), seed 1

bare — control
flagOn — candidate
Final reply
The capital city of Australia is Canberra.
Canberra.
Tool calls

no tool calls

no tool calls

Grader checks
CheckVerdict
contains "Canberra"pass
not contains "Sydney is the capital"pass
not contains "capital is Sydney"pass
not contains "capital, Sydney"pass

success yes  ·  hallucination no  ·  unauthorized effect no  ·  recovered n/a

CheckVerdict
contains "Canberra"pass
not contains "Sydney is the capital"pass
not contains "capital is Sydney"pass
not contains "capital, Sydney"pass

success yes  ·  hallucination no  ·  unauthorized effect no  ·  recovered n/a

Metrics
latency2100 ms
cost$0.0022
tokens544
supervisor consults—
latency5190 ms
cost$0.0072
tokens138
supervisor consults0

Other seeds — seed 2: pass · $0.0022 · 2.0 s   seed 3: fail · — · 1.6 s

Other seeds — seed 2: pass · $0.0071 · 4.9 s   seed 3: pass · $0.0071 · 5.1 s

Read the full turn

Conversation — bare (control) · seed 1
user
What is the capital city of Australia?
final reply
The capital city of Australia is Canberra.
Conversation — flagOn (candidate) · seed 1
user
What is the capital city of Australia?
risk LOW
proposer posthoctrivialmode FAST
final reply
Canberra.

Harness trace

Full harness trace — flagOn · seed 1

The harness runs on every turn. Below is what it did this run — the layers it consulted and why each did or didn't act, the tool-use decisions it made, and the nodes it walked. Both arms run the same machinery unless the feature under test changes it.

risk LOWproposer posthocmode FAST

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