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Run: 2026-10-08-01M4DYHFWCA3W6YHD64DWVQD8G
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Max)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
2m 23s
Cost:
$0.019011
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain hammered against the windows of Blackwood Manor all night. By dawn the storm had surrendered, leaving the estate hushed. Martha Greaves came downstairs early, eager to light the hearth. The library door was locked, which Blackwood would never tolerate. She knocked twice, then called his name, receiving no reply. Silence answered her, thick and wrong, like a held breath. She fetched the spare key from its hook, hands trembling. The key turned stiffly, and the heavy door groaned open. Lord Edmund Blackwood sat slumped across his mahogany desk, motionless. A crystal brandy glass lay shattered beside his polished boot. Her scream tore through the sleeping house, sharp as glass. Arthur Finch, the butler, arrived minutes later, buttoning his coat. He took one look at the body and turned ashen. His gaze drifted to the window, bolted tight from within. The hall clock struck seven, utterly indifferent to the horror. Inspector Helen Marsh arrived shortly after, soaked to the bone. Helen knelt beside the desk and studied the broken crystal. Beneath his cold fingers rested a single queen of spades. The faint scent of bitter almonds hung in the air. Poison, she thought, and someone had planned every last detail. Helen asked, "Who else has a key to this room?" "Only the family and I have keys, Inspector," Arthur whispered. Helen noticed that one of his waistcoat buttons was misaligned. The killer, Helen suspected, had not yet left this house.
created_at
"2026-10-08T14:26:40.662Z"
10/8/2026, 2:26:40 PM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2443
moderation_latency
(null)
generation_time
142683
tokens_prompt
46
tokens_completion
5714
native_tokens_prompt
62
native_tokens_completion
38009
native_tokens_completion_images
(null)
native_tokens_reasoning
37490
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
0.0190107
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791469600-C3FIFs4jWBGbwev8Kdvs"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791469600-BGoVooyFJYI2Xe5CyO72"
upstream_id
"msg_011CfpvdkW7sy7K3jWjGrqat"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpvdkW7sy7K3jWjGrqat"
is_byok
false
latency
826
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0190107
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
24
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10
15
10
16
10
17
10
18
10
19
10
20
10
21
10
22
10
23
10