Model

Claude Opus 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYWZWWQMZHCGMQBXF3YSW9S

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 mansion stood eerily silent. Detective Morgan approached the door. Rain fell on cold stone. She knocked three times hard. No answer came from inside. The door creaked slowly open. Darkness filled the grand hallway. Her flashlight cut through shadows. A chandelier hung above precariously. Crystal pieces littered the floor. She stepped over broken glass. The smell hit her hard. Death lingered in the air. Morgan followed the terrible scent. It led toward the library. Ancient books lined every wall. A fireplace held dying embers. Then she saw the body. Lord Ashworth lay completely still. Blood pooled beneath his head. A letter opener protruded grotesquely. His eyes stared at nothing. Morgan knelt beside the corpse. This was no simple accident. Someone wanted this man dead.
created_at"2026-02-08T15:12:51.348283+00:00" Sunday, February 8th, 2026 at 3:12:51 PM GMT+00:00
model"anthropic/claude-4.5-opus-20251124" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2118
moderation_latency165
generation_time5747
tokens_prompt35
tokens_completion161
native_tokens_prompt44
native_tokens_completion177
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" 
usage0.004645
router(null)
provider_responses
0
id"6cbc67b7-da07-45b8-989f-dfd067010ab3" 
status200
is_byokfalse
latency2117
endpoint_id"de32581c-2e11-4f54-8d29-e8a6e19d3038" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-opus-20251124" 
api_type"completions" 
id"gen-1770563564-fz1FwJgNASgI569x56MV" 
upstream_id"6cbc67b7-da07-45b8-989f-dfd067010ab3" 
total_cost0.004645
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
sentences25
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