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Run: 2026-10-09-01M4G17053Y9WGS1JVPY1GKWTW
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
11.4s
Cost:
$0.001326
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 on Ashford Manor for three relentless days, washing the gravel paths clean of every single footprint. Detective Inspector Harold Finch arrived at dawn, his wet coat heavy with the smell of wood smoke and old secrets. Lord Edmund Vale had been found dead in his locked study, slumped across a mahogany desk covered with unfinished letters. Beside his outstretched hand lay a silver letter opener, polished so brightly that Finch could see his own frightened reflection. The household staff gathered silently in the grand hallway, whispering and trembling, each one avoiding the gaze of the others. Finch quietly noticed the cook's scarred hands, the gardener's muddy boots, and the butler's loose collar, all hinting at guilt. Somewhere above them, a clock struck nine, and the silence that followed felt like a verdict waiting to be read.
created_at
"2026-10-09T09:51:51.465Z"
10/9/2026, 9:51:51 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2269
moderation_latency
(null)
generation_time
11417
tokens_prompt
46
tokens_completion
562
native_tokens_prompt
62
native_tokens_completion
2640
native_tokens_completion_images
(null)
native_tokens_reasoning
2346
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
0.0013262
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791539511-lVNzfDGP1pwjps7F6asJ"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791539511-KyfsUyLK5agXUCcGsKto"
upstream_id
"msg_011CfrTVB2chECNTr8EF4Dwo"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfrTVB2chECNTr8EF4Dwo"
is_byok
false
latency
727
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0013262
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20