NC Bench
Overview
About
Tests
Models
Model
Claude Opus 4.6
Test
N-Length Sentences
Scenario
Write sentences with 10 words each
Run ID
2026-02-08-01KGYWZQA0TAPRD6PH4CV3DGH3
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The old mansion stood silently at the end of town. Detective Morgan arrived just as the clock struck midnight sharp. Rain poured down heavily, soaking the gravel path leading inside. A single light flickered behind the curtain on floor two. The butler opened the door with trembling hands and spoke. "Sir, the master of the house is dead," he said. Morgan stepped inside and noticed muddy footprints on the floor. The chandelier above cast long shadows across the grand hallway. A broken wine glass lay shattered near the spiral staircase. Upstairs, the body of Lord Ashworth waited in cold silence.
created_at
"2026-02-08T15:12:45.969327+00:00"
Sunday, February 8th, 2026 at 3:12:45 PM GMT+00:00
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2432
moderation_latency
(null)
generation_time
6654
tokens_prompt
35
tokens_completion
120
native_tokens_prompt
44
native_tokens_completion
146
native_tokens_completion_images
(null)
native_tokens_reasoning
0
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.00387
router
(null)
provider_responses
0
id
"msg_01VXsrxcW32GRzepoCFuw2T2"
status
200
is_byok
false
latency
2432
endpoint_id
"c926c048-563e-44b0-8434-95965bee924c"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.6-opus-20260205"
api_type
"completions"
id
"gen-1770563558-LIya5lxIK8K0TCjAfIva"
upstream_id
"msg_01VXsrxcW32GRzepoCFuw2T2"
total_cost
0.00387
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10