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Run: 2026-10-09-01M4G0WS3ME21BG9F6FCFZ2XK2
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
12.5s
Cost:
$0.001206
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 Manor since dawn, washing the gravel paths grey and turning the lawns to mud. Inspector Eleanor Marsh arrived at half past seven, her coat dripping onto the polished hallway floor beside a trembling constable. Lord Harold Ashford lay motionless and sprawled beside the cold library fireplace, a silver letter opener protruding from his chest. Nobody in the sprawling household admitted hearing a single sound, though every one of them had been painfully wide awake. Marsh crouched beside the body, noting the dried blood, the overturned chair, and the single muddy footprint near the window. Whoever had killed Lord Ashford had walked through the house with ease, and that troubled her deeply as she rose.
created_at
"2026-10-09T09:46:16.57Z"
10/9/2026, 9:46:16 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2679
moderation_latency
(null)
generation_time
12454
tokens_prompt
46
tokens_completion
472
native_tokens_prompt
62
native_tokens_completion
2400
native_tokens_completion_images
(null)
native_tokens_reasoning
2149
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
0.0012062
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791539176-47yfhc95fYG74w58BKqJ"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791539176-FhdQiBNeuIKtmAjsW6vL"
upstream_id
"msg_011CfrT4VQU41bfct7CrBrnk"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfrT4VQU41bfct7CrBrnk"
is_byok
false
latency
783
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0012062
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
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20