Model

Claude Opus 4.6

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYZC7T55471EYYZY8831WBE

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 Ross approached the door. Blood stained the marble floor. A woman lay there dead. Her eyes stared at nothing. The butler trembled with fear. "I discovered her at dawn." Ross knelt beside the body. A knife was missing nearby. Someone had fled the scene. Rain pattered against dark windows. This night held terrible secrets. The grandfather clock struck seven. No one could leave now. Every guest became a suspect.
created_at"2026-02-08T15:54:31.650926+00:00" Sunday, February 8th, 2026 at 3:54:31 PM GMT+00:00
model"anthropic/claude-4.6-opus-20260205" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1785
moderation_latency(null)
generation_time5014
tokens_prompt35
tokens_completion96
native_tokens_prompt44
native_tokens_completion100
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" 
usage0.00272
router(null)
provider_responses
0
id"msg_01T5TTr848q76FdFrsobd1S5" 
status200
is_byokfalse
latency1783
endpoint_id"c926c048-563e-44b0-8434-95965bee924c" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.6-opus-20260205" 
api_type"completions" 
id"gen-1770566066-n9WTdrA7vYPsvRIlG0jZ" 
upstream_id"msg_01T5TTr848q76FdFrsobd1S5" 
total_cost0.00272
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
92.8571% Matches word count n/a
neededCleanfalse
sentences14
wordCounts
05
15
25
35
45
55
610
75
85
95
105
115
125
135