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Run: 2026-10-08-01M4DAJQ5D47V2WA9W6A4Q853N
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
11.9s
Cost:
$0.001474
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 not stopped for three long days, and Detective Mara Quinn resented every single minute of the downpour. Water streamed down the tall windows of Ashford Manor, blurring the old portraits that watched her from the dim hallway. Lord Edmund Ashford lay dead at the foot of the grand staircase, a silver letter opener jutting from his chest. Quinn knelt beside the body, noting the muddy footprints that led away from the study door toward the servants' kitchen. Nobody in the household had admitted to leaving their rooms after midnight, which made every one of them a suspect. Quinn glanced at the antique clock above the mantel, its brass hands frozen stubbornly at twenty past eleven last night. Someone had carefully wound that clock, or else someone had badly wanted the local constables to believe one convenient lie. Quinn pulled on her gloves, took a breath, and stepped very carefully over the blood toward the waiting chaos below.
created_at
"2026-10-08T08:37:49.368Z"
10/8/2026, 8:37:49 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
11883
moderation_latency
(null)
generation_time
11883
tokens_prompt
46
tokens_completion
238
native_tokens_prompt
62
native_tokens_completion
2936
native_tokens_completion_images
(null)
native_tokens_reasoning
2621
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
0.0014742
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448669-fv6vGhs6rmbmIxsFwTUA"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448669-zvhKuHTG502tPWd0yTrX"
upstream_id
"msg_011CfpU2oyihkTBiBkU7WZsH"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpU2oyihkTBiBkU7WZsH"
is_byok
false
latency
720
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0014742
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