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Run: 2026-02-24-01KJ8VFTNQ1YQ4H528B774V62D
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
45.8s
Cost:
$0.094005
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
The body lay crumpled beneath the ancient oak tree, its gnarled branches casting long dark shadows across the damp lawn. Detective Clara Marsh stepped out of her black sedan and studied the scene with the weary eyes of a veteran. She had seen dozens of crime scenes before, but something about this one made her stomach twist with cold dread. The victim was a young woman in a red dress, her pale fingers still clutching a torn envelope with desperation. Rain began to fall in thin silver threads, threatening to wash away whatever evidence the killer had carelessly left behind. A uniformed officer approached her, his face pale and drawn, clearly shaken by what he had discovered only minutes earlier. He told her the groundskeeper found the body at dawn while making his usual rounds through the sprawling Montgomery estate. Clara knelt beside the woman and noticed a single word written in lipstick on the inside of her left wrist. The word was "remember," and it sent a chill racing down her spine like a whisper from the dead itself. Clara stood slowly, scanning the tree line where the dark woods bordered the estate, sensing that someone was watching her. This was not a random killing, she thought, pulling her coat tighter against the bitter wind sweeping across the grounds. Whoever did this wanted the body found here, wanted it displayed like a message only the right person could read. Clara pulled out her notebook, clicked her pen, and made a silent promise to the dead woman lying before her. She would find the killer, no matter how deep the secrets ran or how powerful the people protecting them were.
created_at
"2026-02-24T22:14:35.455Z"
2/24/2026, 10:14:35 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1481
moderation_latency
156
generation_time
45457
tokens_prompt
46
tokens_completion
758
native_tokens_prompt
61
native_tokens_completion
3748
native_tokens_completion_images
(null)
native_tokens_reasoning
328
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
0.094005
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"f67de4b8-8be4-4761-8591-fa72bb7af06b"
is_byok
false
latency
1448
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771971275-kDoLsfXfBQhmGIUME27V"
upstream_id
"f67de4b8-8be4-4761-8591-fa72bb7af06b"
total_cost
0.094005
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
14
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20
10
20
11
20
12
20
13
20