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Run: 2026-02-24-01KJ8VX93S5HJRZDZFVVGW1N50
Run Details
Model:
Claude Sonnet 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1m 26s
Cost:
$0.152628
Provider:
Anthropic
Evaluation summary
Score
Evaluator
Details Link
100.00%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Detective Mara Cole arrived at the crumbling old manor just before midnight with her long dark coat soaked completely through. The heavy front door had been left wide open and was swinging slowly back and forth on its rusted hinges. Inside, the grand hallway stretched before her, lit only by a few flickering candles that cast long and eerie shadows. At the far end of the hallway she could see a body face down upon the cold marble floor below. Mara approached slowly, her right hand reaching instinctively for the small service pistol she always kept holstered at her hip. The victim was an older man dressed in an expensive black suit, his silver hair fanned around his pale face. A single red rose had been carefully placed in his right hand, its sharp thorns drawing thin lines of blood. Mara crouched down beside him and studied the grim scene with the cold certainty that nothing about this was accidental. Someone had wanted this man dead, and that same someone had wanted the entire world to know about it too. She stood slowly, reached for her phone, and with one deep breath called it in, already dreading what lay ahead.
created_at
"2026-02-24T22:21:56.226Z"
2/24/2026, 10:21:56 PM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
706
moderation_latency
(null)
generation_time
86085
tokens_prompt
46
tokens_completion
1872
native_tokens_prompt
61
native_tokens_completion
10163
native_tokens_completion_images
(null)
native_tokens_reasoning
1588
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.152628
router
(null)
provider_responses
0
endpoint_id
"6d408764-7dd7-4626-bb87-a6cc1589bc86"
id
"msg_01Cj5zShcM5nAz3oTuMwkTEQ"
is_byok
false
latency
699
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
provider_name
"Anthropic"
status
200
api_type
"completions"
id
"gen-1771971716-3VQKnzLWK3DU7On2G8U6"
upstream_id
"msg_01Cj5zShcM5nAz3oTuMwkTEQ"
total_cost
0.152628
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20