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Run: 2026-10-08-01M4DAMQME52VMCE5S8A8VT7K9
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
10.0s
Cost:
$0.001236
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 been falling over Ashford Manor since midnight, washing the cobbled courtyard into a dark and restless mirror. Inspector Eleanor Vance stood beneath the dripping eaves, her collar turned up against a cold wind that smelled of woodsmoke. Behind her, the great oak doors stood open, spilling yellow lamplight across the wet stones where the body had lain. Sergeant Thomas Hale hovered at her elbow, notebook clutched in gloved hands, his face unusually pale beneath the constable's umbrella. Lord Gregory Ashford had been found at the foot of the east staircase, his neck bent at an impossible angle. Nobody in the household admitted hearing a sound, which Vance found more interesting than any scream could possibly have been. She made a note, underlined it twice, and quietly wondered which of the nine guests in that house was lying.
created_at
"2026-10-08T08:38:55.382Z"
10/8/2026, 8:38:55 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
9974
moderation_latency
(null)
generation_time
9974
tokens_prompt
46
tokens_completion
212
native_tokens_prompt
62
native_tokens_completion
2460
native_tokens_completion_images
(null)
native_tokens_reasoning
2168
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
0.0012362
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448735-wZJZiKnDzIITPuhulWv0"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448735-2NcNLhAn1JWKnxXeNF13"
upstream_id
"msg_011CfpU7gCnwsMHt6cntAai7"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpU7gCnwsMHt6cntAai7"
is_byok
false
latency
699
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0012362
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