Model

Claude Opus 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGZ01Y31R0V5V0Y05MASDFF5

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 completely silent. Rain pelted the old windows. Detective Morris arrived at midnight. She stepped onto wet gravel. The butler opened heavy doors. His face showed genuine concern. A body awaited her upstairs. The victim was Lord Ashworth. He lay beside his desk. Blood pooled on Persian carpet. A letter opener protruded grotesquely. Morris knelt down to look. No signs of forced entry. Someone he knew did this. The widow wept in silk. Three guests remained in residence. Each one had dark secrets. Each one had strong motives. Morris pulled out her notebook. This night would prove long.
created_at"2026-02-08T16:06:23.394353+00:00" Sunday, February 8th, 2026 at 4:06:23 PM GMT+00:00
model"anthropic/claude-4.5-opus-20251124" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1778
moderation_latency152
generation_time5581
tokens_prompt35
tokens_completion129
native_tokens_prompt44
native_tokens_completion138
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" 
usage0.00367
router(null)
provider_responses
0
id"2e8e7c4f-afb5-4c04-86a0-f6c6e90c8f28" 
status200
is_byokfalse
latency1778
endpoint_id"de32581c-2e11-4f54-8d29-e8a6e19d3038" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-opus-20251124" 
api_type"completions" 
id"gen-1770566776-ImSjv01Nr77mSaGQ3CdI" 
upstream_id"2e8e7c4f-afb5-4c04-86a0-f6c6e90c8f28" 
total_cost0.00367
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