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Run: 2026-02-24-01KJ8WAZGP39Q9TC9Q3KNYVVMY
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
27.6s
Cost:
$0.074505
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 grand staircase, one pale hand still clutching a small torn piece of dark velvet. Detective Mara Cole stepped through the front door of the Ashworth mansion, brushing rain from her long black leather coat. The grandfather clock in the hallway had stopped at precisely eleven forty-seven, and nobody in the house could explain why. She knelt beside the victim, a wealthy old man named Gerald Ashworth, whose eyes were still wide open with terror. A crystal glass lay shattered on the marble floor nearby, and the sharp scent of bitter almonds filled the air. Seven guests had been invited to dinner that evening, and every single one of them had a reason to kill. Mara stood slowly and surveyed the room, noting the overturned chair, the scattered papers, and the blood on the wall. Someone in this house had committed a terrible act, and the storm outside meant that no one could leave tonight. She pulled her notebook from her pocket and began to write, knowing that the truth was hiding among the living. The dead always spoke to those who listened carefully enough, and Detective Cole was very good at listening to them.
created_at
"2026-02-24T22:29:25.152Z"
2/24/2026, 10:29:25 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1460
moderation_latency
212
generation_time
27276
tokens_prompt
46
tokens_completion
912
native_tokens_prompt
61
native_tokens_completion
2968
native_tokens_completion_images
(null)
native_tokens_reasoning
605
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
0.074505
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"6adb66f2-79f1-4e27-8da4-9c99ea42b41e"
is_byok
false
latency
1459
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771972165-WtnfADLQjKwjhUdljwGY"
upstream_id
"6adb66f2-79f1-4e27-8da4-9c99ea42b41e"
total_cost
0.074505
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
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20