Model

Claude Sonnet 4.5

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYYM6K9K8YX28H7V1JTNMGK

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 fog rolled thick over Blackwood Manor's crumbling stone walls. Detective Sarah Chen stepped carefully through the heavy iron gate. Her partner, Marcus Webb, followed close behind her without speaking. They had received an urgent call at precisely midnight today. Lord Edmund Blackwood lay dead in his vast, ornate library. A single gunshot wound marked the center of his forehead. The household staff waited nervously in the cold, drafty parlor. Nobody had left the estate since discovering the grim body. Sarah noticed muddy footprints leading away from the crime scene. Ten suspects, one victim, and countless secrets filled this house.
created_at"2026-02-08T15:41:22.89794+00:00" Sunday, February 8th, 2026 at 3:41:22 PM GMT+00:00
model"anthropic/claude-4.5-sonnet-20250929" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1202
moderation_latency173
generation_time3866
tokens_prompt35
tokens_completion124
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" 
usage0.002172
router(null)
provider_responses
0
id"0caf3b51-be73-4022-b196-568b0eb5f6cc" 
status200
is_byokfalse
latency1202
endpoint_id"d8bee848-f020-454a-b2be-4a7ce868f99f" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-sonnet-20250929" 
api_type"completions" 
id"gen-1770565278-5ENiVdCJHrd4yAWhCt86" 
upstream_id"0caf3b51-be73-4022-b196-568b0eb5f6cc" 
total_cost0.002172
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
sentences10
wordCounts
010
110
210
310
410
510
610
710
810
910