NC Bench
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Run: 2026-02-18-01KHQ9180QG2KEAESA61G6224W
Run Details
Model:
Claude Sonnet 4.6
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.4s
Cost:
$0.003417
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
0.25%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The old lighthouse had stood at the edge of Dunmore Cliff for nearly two hundred forgotten years. Nobody in the village had ever expected to find a body washed up on its steps. Detective Iris Calloway arrived at the scene just as the morning fog began swallowing the shore. She pulled her coat tighter and studied the pale figure lying motionless against the barnacled stone. The victim was a man, perhaps fifty, dressed in an expensive suit completely wrong for weather. Sergeant Potts handed her a small evidence bag containing a single gold button and a key. Iris knelt beside the body and noticed three deep scratches carved carefully into the stone nearby. They formed the shape of a compass, pointing inland toward the shuttered Aldridge estate on hill. No wallet, no identification, no phone — just a faint smell of cedar and something like ash. A local fisherman stood nervously nearby, insisting he had heard no screaming throughout the entire dark night.
created_at
"2026-02-18T02:25:04.753267+00:00"
2/18/2026, 2:25:04 AM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1111
moderation_latency
202
generation_time
6113
tokens_prompt
46
tokens_completion
249
native_tokens_prompt
44
native_tokens_completion
219
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
0.003417
router
(null)
provider_responses
0
id
"3b6e4ba0-0dce-4de6-a16f-a9eb3c419520"
status
200
is_byok
false
latency
1110
endpoint_id
"83d802cb-44f2-45a0-a9d5-cb9bf79777c8"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
api_type
"completions"
id
"gen-1771381497-9IBxZCXGLNzdxDqBKasl"
upstream_id
"3b6e4ba0-0dce-4de6-a16f-a9eb3c419520"
total_cost
0.003417
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
0.25%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
17
1
16
2
16
3
16
4
16
5
16
6
16
7
16
8
16
9
17