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Run: 2026-02-24-01KJ8V5EJZ2R929PQWMKAKPF1W
Run Details
Model:
Claude Sonnet 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1m 50s
Cost:
$0.187923
Provider:
Amazon Bedrock
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain fell hard on Ashwood Manor as Detective Clara Hess slowly stepped out of her black car and looked up. The old house rose five stories high against a bruised and angry sky that seemed ready to swallow it whole. Someone had called her from inside those walls barely six hours ago, and then the phone line had gone dead. The caller had whispered that a man lay dead inside the manor before the signal became nothing but cold static. Clara pulled her dark coat tight against the cold rain and walked with careful deliberate steps toward the iron gate. The iron gate swung open on its own the very moment she arrived, and she felt her stomach drop cold. There, laid out on the front steps, was a body face down with one pale hand reaching toward the door. She knelt beside him in the cold rain and felt the heavy, unmistakable weight of nĂ¥got deeply wrong settle in. The man had clearly been dead for several hours, she guessed, and she would wait for the coroner to confirm. Around his neck, a thin red cord had been pulled tight, tied in a knot no careless hand could make. Clara stood, looked up at the manor's dark and silent face, and knew she had just begun a dangerous hunt.
created_at
"2026-02-24T22:08:55.402Z"
2/24/2026, 10:08:55 PM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
735
moderation_latency
223
generation_time
109164
tokens_prompt
46
tokens_completion
936
native_tokens_prompt
61
native_tokens_completion
12516
native_tokens_completion_images
(null)
native_tokens_reasoning
640
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
0.187923
router
(null)
provider_responses
0
endpoint_id
"83d802cb-44f2-45a0-a9d5-cb9bf79777c8"
id
"39402da4-da54-4375-b5c3-40f7839ad293"
is_byok
false
latency
734
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771970935-gjakOQOdg0UPzTHcIyJW"
upstream_id
"39402da4-da54-4375-b5c3-40f7839ad293"
total_cost
0.187923
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20
10
20