Model

Claude Opus 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYY7242XFCVMJQ5WTAGP6GY

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The mansion stood eerily silent. Detective Moore approached the door. Blood stained the marble floor. A body lay face down. The victim wore expensive clothes. No weapon could be found. Rain began falling outside heavily. Moore knelt beside the corpse. She noticed strange burn marks. The room smelled like almonds. Someone had closed the curtains. A grandfather clock stopped ticking. It read exactly midnight sharp. Moore pulled out her notebook. This case felt deeply personal. The butler appeared behind her. His hands were shaking badly. She had many questions now.
created_at"2026-02-08T15:34:14.052626+00:00" Sunday, February 8th, 2026 at 3:34:14 PM GMT+00:00
model"anthropic/claude-4.5-opus-20251124" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1576
moderation_latency(null)
generation_time5381
tokens_prompt35
tokens_completion111
native_tokens_prompt44
native_tokens_completion120
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" 
usage0.00322
router(null)
provider_responses
0
id"msg_01J5oBSMwx44ttferum1JqSg" 
status200
is_byokfalse
latency1576
endpoint_id"be883404-eb42-4b2d-b6e4-c7daa3aa8d62" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.5-opus-20251124" 
api_type"completions" 
id"gen-1770564847-xKCS9ZaJBfyXLULYPZhN" 
upstream_id"msg_01J5oBSMwx44ttferum1JqSg" 
total_cost0.00322
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
100.0000% Matches word count n/a
neededCleanfalse
sentences18
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175