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Run: 2026-02-24-01KJ8W6GX4TFE7NKANNBNF5GS2
Run Details
Model:
Claude Sonnet 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1m 49s
Cost:
$0.184128
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
The rain had been falling steadily all through the long and bitterly cold night over the quiet town of Crestwood. Someone had called it in at precisely half past two, just a panicked voice reporting that there was a body. Detective Clara Finch was the first to arrive at the scene, her headlights cutting through the heavy curtain of rain. She stepped out of her car and immediately felt the cold bite of the wind against her pale tired face. The Hargrove mansion rose up behind the iron gates like something pulled directly from a very unpleasant and disturbing dream. A young uniformed officer stood at the front door, his face washed gray and his boots sunk in cold mud. Deep inside the grand entrance hall, and beneath a shattered crystal chandelier, lay the still body of Lord Edmund Hargrove. His arms were spread wide, his eyes fixed open toward the ceiling above, his mouth frozen in a silent scream. Clara had seen many crime scenes in her twelve years on the force, but none had ever felt like this. She pulled on her gloves and stepped closer, knowing already that this case would haunt her for many long years.
created_at
"2026-02-24T22:26:59.119Z"
2/24/2026, 10:26:59 PM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
829
moderation_latency
(null)
generation_time
108503
tokens_prompt
46
tokens_completion
2212
native_tokens_prompt
61
native_tokens_completion
12263
native_tokens_completion_images
(null)
native_tokens_reasoning
1931
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
0.184128
router
(null)
provider_responses
0
endpoint_id
"6d408764-7dd7-4626-bb87-a6cc1589bc86"
id
"msg_01QMKbEixyrtr7wDh8qZSRNW"
is_byok
false
latency
825
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
provider_name
"Anthropic"
status
200
api_type
"completions"
id
"gen-1771972019-mET7fVhxIZEin5GdITbk"
upstream_id
"msg_01QMKbEixyrtr7wDh8qZSRNW"
total_cost
0.184128
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