Model

Claude Sonnet 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYX01X4GTWN27C2HSX8D7BX

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 library stood silent tonight. Rain drummed against tall windows. Detective Morrison entered through oaken doors. A body lay sprawled inside. Blood pooled near marble columns. The victim was Thomas Ashworth. He owned this grand estate. His throat showed brutal lacerations. The murder weapon was missing. Morrison studied the grim scene. Bookshelves towered on every wall. A ladder lay toppled nearby. Ashworth's eyes stared at nothing. His fingers clutched a paper. Morrison carefully extracted the note. Five names were written there. All were guests that evening. Thunder crashed outside the mansion. The detective's mind worked quickly. Someone here had killed brutally. Someone here was lying now. The night promised dark secrets.
created_at"2026-02-08T15:12:56.250048+00:00" Sunday, February 8th, 2026 at 3:12:56 PM GMT+00:00
model"anthropic/claude-4.5-sonnet-20250929" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1682
moderation_latency135
generation_time5903
tokens_prompt35
tokens_completion150
native_tokens_prompt44
native_tokens_completion161
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" 
usage0.002547
router(null)
provider_responses
0
id"74819493-c586-4214-9167-e2e89542fbd1" 
status200
is_byokfalse
latency1672
endpoint_id"d8bee848-f020-454a-b2be-4a7ce868f99f" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-sonnet-20250929" 
api_type"completions" 
id"gen-1770563569-jRPhnnaW4cafH9x0yoSQ" 
upstream_id"74819493-c586-4214-9167-e2e89542fbd1" 
total_cost0.002547
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
98.9945% Matches word count n/a
neededCleanfalse
sentences22
wordCounts
05
15
26
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195
205
215