NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-09-29-01M3P2D30VR43ZFN54SC9Z907A
Run Details
Model:
Claude Sonnet 5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
17.6s
Cost:
$0.022184
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 fog rolled over Blackwood Manor like a burial shroud, swallowing the gardens and muffling everything except the distant bells. Inspector Ada Verrin stepped from her car at midnight, pulled her collar tight, and studied the lit windows above her. Constable Hayes met her at the door, trembling, and whispered that Lord Ashcombe was found dead in his locked study. The room smelled of bitter almonds and old leather, and the victim sat slumped behind his desk, hand still outstretched. Beside his fingers lay a shattered teacup, and on the blotter someone had scrawled one shaky name in ink: Marguerite. Ada scanned the silent room, certain that the killer stood somewhere beneath this roof, waiting quietly for her to begin.
created_at
"2026-09-29T07:52:24.353Z"
9/29/2026, 7:52:24 AM
model
"anthropic/claude-sonnet-5.5-20260928"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3767
moderation_latency
(null)
generation_time
17592
tokens_prompt
46
tokens_completion
558
native_tokens_prompt
62
native_tokens_completion
2206
native_tokens_completion_images
(null)
native_tokens_reasoning
1950
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
0.022184
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1790668344-jEPRjPzKNy5abe072SIO"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1790668344-O5s7Eg4NotjlLQaR0wIJ"
upstream_id
"msg_011CfXNHhAbzEqZ4LoyNxRks"
provider_responses
0
endpoint_id
"99aaad94-923b-4fc1-b763-271ed5486f7a"
id
"msg_011CfXNHhAbzEqZ4LoyNxRks"
is_byok
false
latency
629
model_permaslug
"anthropic/claude-sonnet-5.5-20260928"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.022184
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