NC Bench
Overview
About
Tests
Models
Vendors
Compare
Run: 2026-02-24-01KJ8VYW8ZVX9V6XHNAV4678GV
Run Details
Model:
Claude Sonnet 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
58.4s
Cost:
$0.091428
Provider:
Anthropic
Evaluation summary
Score
Evaluator
Details Link
100.00%
Matches word count
(details)
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 stone manor stood silent under the dark moon. Rain drummed steadily against every tall and leaded window pane. Detective Marlowe pushed through the heavy oak front door alone. The smell of copper and old candle wax hit her. A body lay sprawled at the foot of the stairs. The victim was Lord Hargrove, a man of great wealth. His pale eyes stared up at the cracked plaster ceiling. No murder weapon was visible anywhere within the dim hallway. Marlowe knelt and studied the deep wound behind his ear. Then, somewhere deep in the manor, a door slammed shut. She was not alone, and she knew it too well. Marlowe stood and drew her gun into the waiting dark.
created_at
"2026-02-24T22:22:48.616Z"
2/24/2026, 10:22:48 PM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
900
moderation_latency
(null)
generation_time
58310
tokens_prompt
46
tokens_completion
1242
native_tokens_prompt
61
native_tokens_completion
6083
native_tokens_completion_images
(null)
native_tokens_reasoning
1076
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
0.091428
router
(null)
provider_responses
0
endpoint_id
"6d408764-7dd7-4626-bb87-a6cc1589bc86"
id
"msg_01PbPSSRRvGrZ9mxno2cEAj3"
is_byok
false
latency
547
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
provider_name
"Anthropic"
status
200
api_type
"completions"
id
"gen-1771971768-tXwUxPsk80msA75wgoKt"
upstream_id
"msg_01PbPSSRRvGrZ9mxno2cEAj3"
total_cost
0.091428
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
12
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10