NC Bench
Overview
About
Tests
Models
Model
Claude Opus 4.5
Test
N-Length Sentences
Scenario
Write sentences with 10 words each
Run ID
2026-02-08-01KGYY7V8T4D7SAP4VRP5MKVH3
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 grandfather clock struck midnight when the body was discovered. Detective Sarah Mills arrived at the old Victorian mansion promptly. Rain pelted the windows like tiny fists demanding swift entry. A maid stood trembling beside the library's heavy oak door. "I found him there, ma'am, lying in his own blood." The victim was Harold Pierce, wealthy patriarch of the estate. His cold eyes stared blankly at the chandelier hanging above. A letter opener protruded grotesquely from the center of chest. No signs of forced entry were found anywhere in house. Sarah knelt down and examined the wound with careful precision. The killer had struck with purpose, anger, and deadly intent. Three family members waited nervously in the drawing room nearby. Each one stood to inherit millions from the dead man. Sarah knew that before dawn she would unmask the murderer.
created_at
"2026-02-08T15:34:40.375824+00:00"
Sunday, February 8th, 2026 at 3:34:40 PM GMT+00:00
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2116
moderation_latency
180
generation_time
6146
tokens_prompt
35
tokens_completion
171
native_tokens_prompt
44
native_tokens_completion
197
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)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.005145
router
(null)
provider_responses
0
id
"9c8372e9-b7fe-42d3-95de-a31010943f2e"
status
200
is_byok
false
latency
2115
endpoint_id
"de32581c-2e11-4f54-8d29-e8a6e19d3038"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1770564873-Kw2taETlXmIbUpas6kHM"
upstream_id
"9c8372e9-b7fe-42d3-95de-a31010943f2e"
total_cost
0.005145
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Matches word count
n/a
neededClean
false
sentences
14
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10