Model

Claude Opus 4.6

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYY5PQMH2H2QK8CNPAJ5SSP

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 without mercy. Detective Shaw approached the house. Yellow tape surrounded the yard. A body lay inside waiting. Blood stained the white carpet. The victim was Margaret Cole. Her eyes stared at nothing. No signs of forced entry. Someone she knew did this. Shaw pulled on latex gloves. The room smelled like copper. A broken glass lay nearby. Red wine pooled beneath it. The clock read half past. Midnight had claimed another soul. Neighbors reported hearing loud screams. Nobody bothered to investigate though. This town kept its secrets. Shaw knelt beside the body. A single wound marked her. The knife was nowhere found. Her husband was conveniently absent. Shaw wrote notes in silence. This case would prove difficult. The truth hides in shadows.
created_at"2026-02-08T15:33:31.151163+00:00" Sunday, February 8th, 2026 at 3:33:31 PM GMT+00:00
model"anthropic/claude-4.6-opus-20260205" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1504
moderation_latency(null)
generation_time7052
tokens_prompt35
tokens_completion152
native_tokens_prompt44
native_tokens_completion166
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" 
usage0.00437
router(null)
provider_responses
0
id"msg_01CY3UgYiTUrUKVBb9BU8CTj" 
status200
is_byokfalse
latency1504
endpoint_id"c926c048-563e-44b0-8434-95965bee924c" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.6-opus-20260205" 
api_type"completions" 
id"gen-1770564803-hotcuoH4ikEFNQ2jpNOJ" 
upstream_id"msg_01CY3UgYiTUrUKVBb9BU8CTj" 
total_cost0.00437
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

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