Model

Claude Opus 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYYYHK03E7WR2ES8JH9RFF1

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 Blackwood Manor Mystery The rain fell without mercy. Detective Mills arrived at midnight. Blackwood Manor loomed above her. Lightning revealed its broken windows. She climbed the stone steps. The door stood slightly open. Inside, darkness swallowed all light. Her flashlight cut through shadows. A grandfather clock ticked loudly. It had stopped at nine. She found him upstairs alone. Lord Blackwood lay quite still. Blood pooled on Persian carpet. His eyes stared at nothing. A knife protruded from chest. The window was wide open. Curtains danced in cold wind. Someone had fled this way. Muddy footprints crossed the floor. They led toward the garden. Mills knelt beside the body. His hand clutched something tightly. She pried his fingers open. A torn photograph fell out. Only half a face remained.
created_at"2026-02-08T15:47:04.467208+00:00" Sunday, February 8th, 2026 at 3:47:04 PM GMT+00:00
model"anthropic/claude-4.5-opus-20251124" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1821
moderation_latency165
generation_time6332
tokens_prompt35
tokens_completion169
native_tokens_prompt44
native_tokens_completion193
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" 
usage0.005045
router(null)
provider_responses
0
id"c5a4e7ce-de67-401f-815d-2ebca38d2ada" 
status200
is_byokfalse
latency1821
endpoint_id"de32581c-2e11-4f54-8d29-e8a6e19d3038" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-opus-20251124" 
api_type"completions" 
id"gen-1770565617-amHNfjKVTgMydaqQoLsg" 
upstream_id"c5a4e7ce-de67-401f-815d-2ebca38d2ada" 
total_cost0.005045
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
sentences26
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195
205
215
225
235
245
255