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Run: 2026-02-24-01KJ8V99MMNEDTEH9NK02XS7V9
Run Details
Model:
Claude Sonnet 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
35.6s
Cost:
$0.059118
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 old lighthouse stood at the edge of the cliff, its pale beam sweeping across the dark and restless sea. Detective Clara Morse arrived just after midnight, her coat soaked through and her breath forming clouds in the cold air. A young uniformed officer met her at the iron gate, his pale face already wearing the hollow look of shock. The body had been found inside the keeper's quarters, sprawled across the cold floor in a way suggesting deliberate murder. Clara knelt carefully beside the victim, a man she immediately recognized as the town's most beloved and fiercely reclusive historian. His eyes were fixed open, staring at the ceiling where someone had drawn a single, perfect red circle in chalk. Clara stood and slowly turned to the officer, asking one quiet question that would define every hour of the investigation. Who knew, she whispered, that this man held the one secret the entire town had struggled so desperately to bury?
created_at
"2026-02-24T22:11:01.404Z"
2/24/2026, 10:11:01 PM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
585
moderation_latency
(null)
generation_time
35484
tokens_prompt
46
tokens_completion
1003
native_tokens_prompt
61
native_tokens_completion
3929
native_tokens_completion_images
(null)
native_tokens_reasoning
767
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
0.059118
router
(null)
provider_responses
0
endpoint_id
"6d408764-7dd7-4626-bb87-a6cc1589bc86"
id
"msg_01DQhX986QdZHpu5dU68qXHx"
is_byok
false
latency
555
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
provider_name
"Anthropic"
status
200
api_type
"completions"
id
"gen-1771971061-qGypWtmaEsanC5qTbNle"
upstream_id
"msg_01DQhX986QdZHpu5dU68qXHx"
total_cost
0.059118
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20