NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-01-01KWEA4EACDPHHZWVKMB9HWW3P
Run Details
Model:
Claude Sonnet 5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
9.2s
Cost:
$0.005360
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
0.01%
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 Last Guest Rain hammered the old mansion's windows while thunder rolled across the darkened hills like distant drums. Detective Sarah Chen stepped through the doorway, her flashlight cutting through the musty, shadowed hallway. The body lay motionless near the fireplace, blood pooling slowly across the antique Persian rug beneath. Seven guests had gathered that evening for what should have been an ordinary dinner party celebration. Now six remained, each one nervously avoiding eye contact with the detective and each other. "Nobody leaves this house," Sarah announced, studying the frightened faces illuminated by flickering candlelight around her. The victim, wealthy businessman Charles Whitmore, had been stabbed once through his cold, unbeating heart. Rain continued pounding against the windows as if nature itself demanded answers to this mystery. Sarah knelt beside the body, noting the expensive watch still ticking on his lifeless wrist. Someone in this house was lying, and she intended to discover exactly who that person was. The butler cleared his throat nervously, glancing toward the grand staircase leading to darkened upper floors. "Detective," he whispered, "there's something you should know about what happened here tonight before dinner." Lightning flashed outside, momentarily illuminating fear etched deeply into every guest's pale, sweating face. Sarah stood slowly, her eyes narrowing as she surveyed the room full of suspects. Whatever secrets this mansion held, she would uncover them before the storm finally passed tonight.
created_at
"2026-07-01T07:43:41.398Z"
7/1/2026, 7:43:41 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1720
moderation_latency
(null)
generation_time
9180
tokens_prompt
46
tokens_completion
417
native_tokens_prompt
60
native_tokens_completion
524
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
0.00536
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01SqrvP5dMA9yJS1z2HrNFrB"
is_byok
false
latency
1720
model_permaslug
"anthropic/claude-sonnet-5-20260630"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.17.0; linux; x64))"
http_referer
(null)
request_id
"req-1782891821-0AxEiYnF90vWsc2JiqnU"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891821-a7ZhV0kiw9Bo5AQ4f7ah"
upstream_id
"msg_01SqrvP5dMA9yJS1z2HrNFrB"
total_cost
0.00536
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
0.01%
Matches word count
n/a
neededClean
false
sentences
16
wordCounts
0
4
1
16
2
15
3
16
4
16
5
15
6
16
7
15
8
15
9
15
10
16
11
16
12
15
13
14
14
14
15
15