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Run: 2026-02-24-01KJ8WEYHTR9BZGH7H559C67B9
Run Details
Model:
Claude Sonnet 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
28.5s
Cost:
$0.045918
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The old manor sat silent beneath the pale October moon. Detective Clara Voss arrived first, her flashlight cutting through fog. Someone had called it in at half past eleven tonight. The iron gate groaned as she pushed it slowly open. Leaves crunched beneath her boots on the long stone path. The front door was already ajar, light spilling outward softly. She stepped inside and immediately noticed the smell of copper. A grandfather clock ticked loudly in the dim entrance hall. The body of Lord Ashworth lay sprawled across the floor. His right hand clutched a torn piece of red fabric. Clara knelt beside him and pulled out her worn notebook. Whoever had done this was careful, deliberate, and very cold. No weapon rested nearby, no glass shattered on the ground. She stood and scanned the room with her trained eyes. A single wine glass sat untouched on the oak table. Two chairs were pulled out, as if guests had left. This was no robbery; nothing valuable had been taken away. Lord Ashworth had been expecting someone he trusted that evening. Clara whispered quietly, knowing the dead never give their answers. She was going to find out who had done this.
created_at
"2026-02-24T22:31:35.234Z"
2/24/2026, 10:31:35 PM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
811
moderation_latency
(null)
generation_time
28422
tokens_prompt
46
tokens_completion
1157
native_tokens_prompt
61
native_tokens_completion
3049
native_tokens_completion_images
(null)
native_tokens_reasoning
866
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
0.045918
router
(null)
provider_responses
0
endpoint_id
"6d408764-7dd7-4626-bb87-a6cc1589bc86"
id
"msg_01BmXUTxrPxcZgcwqqsLBXQi"
is_byok
false
latency
810
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
provider_name
"Anthropic"
status
200
api_type
"completions"
id
"gen-1771972295-OEYbChoiqU64ZAkLzcOZ"
upstream_id
"msg_01BmXUTxrPxcZgcwqqsLBXQi"
total_cost
0.045918
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
20
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10
15
10
16
10
17
10
18
10
19
10