NC Bench
Overview
About
Tests
Models
Model
Claude Sonnet 4.5
Test
N-Length Sentences
Scenario
Write sentences with 10 words each
Run ID
2026-02-08-01KGYXCT1R5KDNBB1D83JNCS5Q
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 body lay sprawled across the marble foyer floor, unmoving. Detective Sarah Chen knelt beside the victim, checking for pulses. Blood pooled beneath his head in a dark crimson circle. The mansion's grandfather clock chimed midnight with echoing, ominous tones. Outside, thunder rumbled while rain lashed against tall gothic windows. Sarah noticed the victim's fingers clutched a torn photograph tightly. She carefully pried it loose, revealing half of someone's face. "Who did this to you?" she whispered to the corpse. Footsteps echoed from the hallway. Someone else was here tonight. Sarah reached for her gun, rising slowly to her feet. A woman in a silk robe appeared, screaming at Sarah. "My husband! Oh God, what happened to my dear husband?" The widow collapsed dramatically, but Sarah noticed something peculiar immediately. There wasn't a single tear falling from the woman's eyes.
created_at
"2026-02-08T15:19:54.087665+00:00"
Sunday, February 8th, 2026 at 3:19:54 PM GMT+00:00
model
"anthropic/claude-4.5-sonnet-20250929"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1895
moderation_latency
146
generation_time
5340
tokens_prompt
35
tokens_completion
185
native_tokens_prompt
44
native_tokens_completion
217
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
0.003387
router
(null)
provider_responses
0
id
"dcb70666-aeef-4333-9e4e-08bd15017d57"
status
200
is_byok
false
latency
1894
endpoint_id
"d8bee848-f020-454a-b2be-4a7ce868f99f"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-sonnet-20250929"
api_type
"completions"
id
"gen-1770563987-OxB8Y2jqag5mSKpQoB53"
upstream_id
"dcb70666-aeef-4333-9e4e-08bd15017d57"
total_cost
0.003387
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
86.6740%
Matches word count
n/a
neededClean
false
sentences
15
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
5
9
5
10
10
11
10
12
10
13
10
14
10