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Run: 2026-10-08-01M4DYQVBM6S296BN3PA44PZNE
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
3.1s
Cost:
$0.000161
Provider:
Claude Platform on AWS
Evaluation summary
Score
Evaluator
Details Link
54.47%
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
The rain had fallen steadily since midnight over Ashford Manor. Detective Inspector Helen Marsh stepped carefully across the wet gravel. Nobody had touched the body lying beneath the great oak tree. Her partner, Sergeant Tom Riley, held an umbrella above her head. The victim was Lord Edmund Vale, owner of the estate for decades. A single gunshot wound marked his left temple, neat and deliberate. Beside him lay a silver pocket watch, stopped at quarter past eleven. Helen crouched low and studied the dark stains spreading through the mud. "Someone wanted this to look like a suicide," Tom murmured quietly. Helen shook her head, noticing the missing glove on the dead man's hand. Upstairs, a curtain shifted in the east window of the silent house. Helen rose slowly, her eyes fixed on that small and sudden movement.
created_at
"2026-10-08T14:30:09.025Z"
10/8/2026, 2:30:09 PM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3008
moderation_latency
(null)
generation_time
3008
tokens_prompt
46
tokens_completion
209
native_tokens_prompt
62
native_tokens_completion
310
native_tokens_completion_images
(null)
native_tokens_reasoning
0
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
0.0001612
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791469809-f61TG61RCC8HwoRq7N9m"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791469809-2r9cO8rZdDF9Y02EhM6y"
upstream_id
"msg_011Cfpvu7d2wnk8UqubSHqFh"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011Cfpvu7d2wnk8UqubSHqFh"
is_byok
false
latency
875
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0001612
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
54.47%
Matches word count
n/a
neededClean
false
sentences
12
wordCounts
0
10
1
10
2
11
3
11
4
12
5
11
6
12
7
12
8
11
9
13
10
12
11
12