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Run: 2026-02-08-01KGYZEEH18N9DFTS6KJNE0P9W
Run Details
Model:
Claude Haiku 4.5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
2.6s
Cost:
$0.000789
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
86.27%
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 Body in the Library The rain fell hard against the old mansion windows tonight. Detective Sarah Chen stepped out of her unmarked police car. A maid had discovered the body at precisely eight o'clock. Lord Edmund Ashworth lay motionless upon the Persian library carpet. His face was pale, his eyes frozen in final shock. A crystal glass lay shattered beside his outstretched trembling hand. The poison had worked quickly, according to the medical examiner. Everyone in the household claimed they were elsewhere when he died. Sarah pulled out her leather notebook and began taking careful notes. Someone in this mansion had wanted Edmund Ashworth very dead.
created_at
"2026-02-08T15:55:41.676171+00:00"
2/8/2026, 3:55:41 PM
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
700
moderation_latency
191
generation_time
2360
tokens_prompt
35
tokens_completion
129
native_tokens_prompt
44
native_tokens_completion
149
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
0.000789
router
(null)
provider_responses
0
id
"3b9c9b1d-8d59-4b67-8378-c687fdff6428"
status
200
is_byok
false
latency
699
endpoint_id
"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1770566138-l6orgxjgYqqRd4HSrTZW"
upstream_id
"3b9c9b1d-8d59-4b67-8378-c687fdff6428"
total_cost
0.000789
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
86.27%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
6
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
11
9
11
10
10