Model

Claude Opus 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYWXJRHSKK5QT6Q6PR7N036

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 manor stood in darkness. Rain pelted the old windows. Detective Morris arrived at midnight. A body awaited his inspection. The victim was Lord Ashworth. Blood pooled on marble floors. His wife discovered him first. She screamed for the butler. Servants gathered in the hallway. Nobody had heard any gunshot. The study door was locked. Someone broke it down quickly. Lord Ashworth had many enemies. His fortune attracted greedy relatives. The detective examined the corpse. A knife wound seemed fatal. No weapon was found nearby. Morris studied each pale face. One person here was guilty. The investigation would begin now.
created_at"2026-02-08T15:11:34.890549+00:00" Sunday, February 8th, 2026 at 3:11:34 PM GMT+00:00
model"anthropic/claude-4.5-opus-20251124" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1366
moderation_latency(null)
generation_time5684
tokens_prompt35
tokens_completion127
native_tokens_prompt44
native_tokens_completion136
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" 
usage0.00362
router(null)
provider_responses
0
id"msg_018DGBhixKkR9mmDpFJjhGYN" 
status200
is_byokfalse
latency1363
endpoint_id"be883404-eb42-4b2d-b6e4-c7daa3aa8d62" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.5-opus-20251124" 
api_type"completions" 
id"gen-1770563488-LczToq0BOMV8KExKkoAU" 
upstream_id"msg_018DGBhixKkR9mmDpFJjhGYN" 
total_cost0.00362
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
100.0000% Matches word count n/a
neededCleanfalse
sentences20
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195