NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-25-01KYCR7NTK57G26BT32QR6T0H7
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
47.4s
Cost:
$0.115975
Provider:
Amazon Bedrock
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 on Ashgrove Manor since midnight, and by dawn the gravel drive resembled a shallow river. Inspector Halloway arrived at seven, boots soaked through, holding a black umbrella that the wind had already turned inside out. The housemaid who had discovered the body stood beneath the portico, wringing her apron, unable to speak a single word. Her name was Nell, she was nineteen years old, and she would never enter the east library again after today. Sir Edmund Verrell lay face down across his desk, one hand gripping a fountain pen, black ink pooling beneath it. The wound sat at the back of his skull, deep and narrow, clearly the work of something heavy and deliberate. Nothing had been stolen, every window was latched, and the heavy oak library door had been locked from the inside. Halloway crouched beside the body, studied the pen, and asked the trembling maid what time she had brought the tea. Half past six, she whispered, and he was already cold, sir, although the green desk lamp was still burning brightly. Somewhere above them a floorboard creaked, and Halloway looked slowly up, counting the seven guests he had not yet met. One of them had killed him, and the rain, mercifully, would keep all of them inside the house until nightfall.
created_at
"2026-07-25T13:43:02.237Z"
7/25/2026, 1:43:02 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4359
moderation_latency
96
generation_time
47129
tokens_prompt
46
tokens_completion
911
native_tokens_prompt
60
native_tokens_completion
4627
native_tokens_completion_images
(null)
native_tokens_reasoning
592
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
0.115975
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNse4xVAYCfJBWgVraNZ"
is_byok
false
latency
1738
model_permaslug
"anthropic/claude-opus-5-20260723"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer
(null)
request_id
"req-1784986982-ECN39TeeLM3hwoG6Xl9V"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986982-KP8AQuWMF8pdeHQB16SD"
upstream_id
"msg_011CdNse4xVAYCfJBWgVraNZ"
total_cost
0.115975
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
response_cache_source_id
(null)
data_region
"global"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20
10
20