Model

Claude Opus 4.6

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYXM1ASKJYDJ1CC8060YACJ

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 silently at the end of town. Detective Morris arrived just as the clock struck eight sharp. Rain hammered the cobblestones like tiny fists demanding swift entry. A body lay crumpled beneath the grand oak staircase below. The victim wore a crimson dress now stained much darker. Her eyes stared upward seeing nothing but the painted ceiling. A single pearl earring was missing from her left ear. The butler stood trembling nearby clutching a silver serving tray. No one had heard the scream that must have come. Every guest claimed they were sleeping soundly through the night. Detective Morris knelt down and studied the bruised pale neck. This was no accident and everyone here knew it well. He pulled his notebook out and began writing careful notes. The killer was still inside this house among the guests. Someone in these dark elegant rooms had blood stained hands.
created_at"2026-02-08T15:23:51.5285+00:00" Sunday, February 8th, 2026 at 3:23:51 PM GMT+00:00
model"anthropic/claude-4.6-opus-20260205" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1332
moderation_latency150
generation_time6628
tokens_prompt35
tokens_completion177
native_tokens_prompt44
native_tokens_completion205
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" 
usage0.005345
router(null)
provider_responses
0
id"7257c16b-bceb-4b36-90c5-5cb0ee7cbfe4" 
status200
is_byokfalse
latency1332
endpoint_id"a8708fb9-08ea-43bb-a3b1-165c87ef09df" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.6-opus-20260205" 
api_type"completions" 
id"gen-1770564224-QY3bRNtDGu6i9xIqi7qv" 
upstream_id"7257c16b-bceb-4b36-90c5-5cb0ee7cbfe4" 
total_cost0.005345
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
sentences15
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1210
1310
1410