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

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_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2116
moderation_latency180
generation_time6146
tokens_prompt35
tokens_completion171
native_tokens_prompt44
native_tokens_completion197
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/" 
is_byokfalse
finish_reason"stop" 
native_finish_reason"stop" 
usage0.005145
router(null)
provider_responses
0
id"9c8372e9-b7fe-42d3-95de-a31010943f2e" 
status200
is_byokfalse
latency2115
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_cost0.005145
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
100.0000% Matches word count n/a
neededCleanfalse
sentences14
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1210
1310