Model

Claude Opus 4.6

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYXP8E9XGRS48XSH6X5W7PX

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 sky. Detective Sarah Blake arrived at the scene just past midnight. Rain hammered the cobblestone path leading to the front iron gate. A single light flickered behind the curtains on the third floor. The body had been discovered by the maid earlier that evening. She found him slumped over his desk in the study room. Blood had pooled beneath the chair and stained the oak floor. No weapon was found anywhere near the dead man's cold body. The doors were locked and every window was latched from inside. Sarah pulled her coat tighter and stepped through the grand doorway. The foyer smelled of old wood and something faintly like copper. She noted the portraits lining the walls with their painted eyes. Each family member had a reason to want him permanently gone. His fortune alone was enough to make anyone consider dark thoughts. Sarah opened her notebook and clicked her pen with steady hands. Someone in this house had committed the perfect crime this night. But every killer makes mistakes and she would find them all.
created_at"2026-02-08T15:25:05.206908+00:00" Sunday, February 8th, 2026 at 3:25:05 PM GMT+00:00
model"anthropic/claude-4.6-opus-20260205" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1657
moderation_latency152
generation_time7358
tokens_prompt35
tokens_completion212
native_tokens_prompt44
native_tokens_completion242
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" 
usage0.00627
router(null)
provider_responses
0
id"84b97c03-adae-4ef1-973c-e1d536ddda33" 
status200
is_byokfalse
latency1653
endpoint_id"a8708fb9-08ea-43bb-a3b1-165c87ef09df" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.6-opus-20260205" 
api_type"completions" 
id"gen-1770564297-EUA258GIzdAZhvWOMzYS" 
upstream_id"84b97c03-adae-4ef1-973c-e1d536ddda33" 
total_cost0.00627
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
75.6064% Matches word count n/a
neededCleanfalse
sentences17
wordCounts
011
110
211
311
411
511
611
711
811
911
1011
1111
1211
1311
1411
1511
1611