Model

Claude Opus 4.6

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYZ26FE3VFRV3GCHB75H5EJ

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 rain fell all night. Detective Mars arrived at dawn. Blood stained the marble floor. Nobody heard a single scream. The mansion felt unnervingly quiet. One window had been shattered. Glass covered the velvet chair. A body lay face down. Her pearls were completely missing. The butler stood nearby trembling. He claimed total complete ignorance. Mars pulled out his notebook. Something here felt terribly wrong. The fireplace still held embers. A half drunk glass remained. She had expected her killer. The door lock showed damage. Muddy footprints led toward stairs. Mars knelt beside the corpse. This case would prove difficult.
created_at"2026-02-08T15:49:02.829715+00:00" Sunday, February 8th, 2026 at 3:49:02 PM GMT+00:00
model"anthropic/claude-4.6-opus-20260205" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1332
moderation_latency126
generation_time5207
tokens_prompt35
tokens_completion126
native_tokens_prompt44
native_tokens_completion141
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" 
usage0.003745
router(null)
provider_responses
0
id"f66b572f-c2d7-4af3-9e08-81cd80d51f64" 
status200
is_byokfalse
latency1332
endpoint_id"a8708fb9-08ea-43bb-a3b1-165c87ef09df" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.6-opus-20260205" 
api_type"completions" 
id"gen-1770565736-88YhvFSRlgiaYBnut1gD" 
upstream_id"f66b572f-c2d7-4af3-9e08-81cd80d51f64" 
total_cost0.003745
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