Model

Claude Opus 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYZBJN917GB15QTQHQVRYAB

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 hammered the stone steps. She knocked three sharp times. No answer came from within. The door creaked slowly open. Darkness swallowed the grand foyer. A chandelier hung above motionless. Her flashlight cut through shadows. Blood stained the marble floor. A body lay face down. The victim wore expensive clothes. Morgan knelt beside the corpse. Lord Ashworth was clearly dead. A knife protruded from back. She examined the ornate handle. This was no random killing. Someone wanted him truly dead. Footsteps echoed from upstairs somewhere. Morgan reached for her weapon.
created_at"2026-02-08T15:54:10.584467+00:00" Sunday, February 8th, 2026 at 3:54:10 PM GMT+00:00
model"anthropic/claude-4.5-opus-20251124" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2525
moderation_latency141
generation_time5504
tokens_prompt35
tokens_completion127
native_tokens_prompt44
native_tokens_completion147
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" 
usage0.003895
router(null)
provider_responses
0
id"16d03556-88b1-4451-9eeb-88817c581640" 
status200
is_byokfalse
latency2524
endpoint_id"de32581c-2e11-4f54-8d29-e8a6e19d3038" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-opus-20251124" 
api_type"completions" 
id"gen-1770566044-cO88MKtbDnfswmrAwc58" 
upstream_id"16d03556-88b1-4451-9eeb-88817c581640" 
total_cost0.003895
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
sentences20
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195