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Run: 2026-02-08-01KGYXRSX9A8MD8H1CHESKFXP6
Run Details
Model:
Claude Haiku 4.5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
2.6s
Cost:
$0.000679
Provider:
Anthropic
Evaluation summary
Score
Evaluator
Details Link
81.56%
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 Detective Sarah Chen arrived at the old mansion early morning. The victim lay sprawled across the Persian rug, quite dead. His name was Victor Ashford, wealthy and widely despised locally. Sarah counted exactly seven people present in the grand foyer. Each suspect wore an expression mixing shock with guilty fear. The butler discovered the body at precisely six o'clock. Nobody had left the house since the dinner party. The storm outside had knocked down trees and power. Sarah's notebook lay ready as she began her investigation. One of these seven people had committed this terrible crime.
created_at
"2026-02-08T15:26:23.470349+00:00"
2/8/2026, 3:26:23 PM
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
465
moderation_latency
(null)
generation_time
2507
tokens_prompt
35
tokens_completion
122
native_tokens_prompt
44
native_tokens_completion
127
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
0.000679
router
(null)
provider_responses
0
id
"msg_018NNJFFdPAAmM5SLrEof8ce"
status
200
is_byok
false
latency
465
endpoint_id
"41d2915a-92e6-4993-b537-210b4e10cba8"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1770564380-ImNqZ0PXfGuAY2iJLzHR"
upstream_id
"msg_018NNJFFdPAAmM5SLrEof8ce"
total_cost
0.000679
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
81.56%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
6
1
10
2
10
3
10
4
10
5
10
6
9
7
9
8
9
9
9
10
10