Model

Claude Opus 4.6

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYY7CKW35ACW1NFYH829VAQ

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 old mansion stood silent against the dark stormy night. Detective Maria Chen arrived at the scene just past midnight. Yellow police tape fluttered wildly in the cold harsh wind. A body lay crumpled at the foot of the stairs. The victim wore an expensive suit stained deep with blood. His eyes stared blankly at the crystal chandelier hanging above. No one had heard the scream that ended his life. The butler claimed he was polishing silver in the kitchen. His hands trembled as he spoke to the young officer. Maria knelt beside the body and pulled on latex gloves. She noticed a strange marking carved into his left palm. The symbol looked ancient, like something from a forgotten language. Rain began to pound heavily against the tall arched windows. Every person in this house tonight was now a suspect. She stood slowly and surveyed the grand room with care. Someone here knew exactly what happened to this poor man. The grandfather clock in the hallway suddenly chimed one loudly. Maria turned to her partner and whispered something very quietly. This was going to be a very long and dark night. The truth was hiding somewhere inside these cold stone walls.
created_at"2026-02-08T15:34:27.646306+00:00" Sunday, February 8th, 2026 at 3:34:27 PM GMT+00:00
model"anthropic/claude-4.6-opus-20260205" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2558
moderation_latency146
generation_time8357
tokens_prompt35
tokens_completion233
native_tokens_prompt44
native_tokens_completion266
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" 
usage0.00687
router(null)
provider_responses
0
id"bf2e3f84-0835-4827-bd33-315bc82ea7ee" 
status200
is_byokfalse
latency2558
endpoint_id"a8708fb9-08ea-43bb-a3b1-165c87ef09df" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.6-opus-20260205" 
api_type"completions" 
id"gen-1770564858-XujsG7NHNUGC8Kq56rUJ" 
upstream_id"bf2e3f84-0835-4827-bd33-315bc82ea7ee" 
total_cost0.00687
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
98.7041% Matches word count n/a
neededCleanfalse
sentences20
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1210
1310
1410
1510
1610
1710
1811
1910