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Run: 2026-10-08-01M4DA1YEKHA044B1SW5S9SGQK
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
12.4s
Cost:
$0.001588
Provider:
Claude Platform on AWS
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 rain had fallen over Ashford Hollow since midnight, washing the cobblestones of Crane Street until they gleamed like bone. Detective Inspector Margaret Lowell stood beneath the flickering streetlamp outside number nine, her breath clouding in the bitter cold air. Behind her, uniformed officers murmured into radios while the ambulance doors stood open, their red lights painting the wet facades. Lowell had seen death in many grim forms, yet nothing had prepared her for the terrible stillness of Edward Harcourt. The old man lay face down on the rug, one hand stretched toward a fallen brandy glass and scattered pearls. Somewhere in the house a clock struck three, and every guest who had sworn silence suddenly turned toward the staircase. Lowell crouched beside the body, pulled on thin gloves, and began reading the room like a page of deliberate lies. Nothing about the scene was as neat as it first appeared, and she fully intended to find out exactly why.
created_at
"2026-10-08T08:28:39.771Z"
10/8/2026, 8:28:39 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
12392
moderation_latency
(null)
generation_time
12392
tokens_prompt
46
tokens_completion
242
native_tokens_prompt
62
native_tokens_completion
3163
native_tokens_completion_images
(null)
native_tokens_reasoning
2834
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"end_turn"
service_tier
"default"
usage
0.0015877
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448119-jZbLuQcy4AVdgAKc6srA"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448119-iItiCAfWQoB0pDhzeaI4"
upstream_id
"msg_011CfpTLJKedmJEQRHDn8s6b"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpTLJKedmJEQRHDn8s6b"
is_byok
false
latency
760
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0015877
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Claude Platform on AWS"
response_cache_source_id
(null)
data_region
"global"
workspace_id
"97e315e5-d303-487d-83c1-83180e8a13d4"
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