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Run: 2026-02-18-01KHQ92G8JJ6ZGBD09Q0A7JYMD
Run Details
Model:
Claude Sonnet 4.6
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.4s
Cost:
$0.004062
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
27.67%
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 keeper discovered the body just before dawn, when pale light crept across the frozen harbor below. Nobody in the small coastal town had expected violence to shatter their quiet lives on such a morning. Margaret Holloway lay face down on the wet rocks, her silver hair splayed like seaweed around her head. Detective Silas Crane arrived within minutes, his boots crunching over gravel as cold wind tore through his coat. He had seen death before, many times, but something about this scene made his stomach tighten with dread. The lighthouse beam continued its slow rotation above, indifferently casting long shadows across the woman's motionless, frost-covered body. A single red glove rested near her outstretched hand, clearly belonging to someone other than the dead woman. Silas crouched down carefully, studying every detail without touching anything, knowing that evidence here could vanish without warning. The keeper, old Thomas Briggs, stood trembling nearby, clutching his lantern as though it might somehow protect him still. Someone in this town had committed an unforgivable act, and Silas was determined to find out exactly who.
created_at
"2026-02-18T02:25:46.210773+00:00"
2/18/2026, 2:25:46 AM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
745
moderation_latency
203
generation_time
6085
tokens_prompt
46
tokens_completion
297
native_tokens_prompt
44
native_tokens_completion
262
native_tokens_completion_images
(null)
native_tokens_reasoning
0
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
0.004062
router
(null)
provider_responses
0
id
"f73589f7-94a3-4236-8f21-3a41aeda3b12"
status
200
is_byok
false
latency
741
endpoint_id
"83d802cb-44f2-45a0-a9d5-cb9bf79777c8"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
api_type
"completions"
id
"gen-1771381539-umnaAKeG14t10eF1SNlx"
upstream_id
"f73589f7-94a3-4236-8f21-3a41aeda3b12"
total_cost
0.004062
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
27.67%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
19
1
18
2
18
3
18
4
18
5
19
6
18
7
18
8
19
9
18