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Run: 2026-02-24-01KJ8X17M7BRYERT2SP3SRT1B3
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
16.4s
Cost:
$0.033130
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 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 face down in the cold dark library. Detective Morris arrived at the scene just after midnight fell. Rain hammered the windows like a thousand tiny desperate fists. No one had heard the gunshot that ended his life. A glass of whiskey sat untouched beside his left hand. The victim was Harold Price, owner of the entire estate. His wife stood in the hallway, trembling but completely silent. She claimed she had been asleep when the murder happened. Morris knelt beside the body and studied the single wound. The bullet had entered cleanly, leaving almost no trace behind. Someone in this house knew exactly what they were doing. Three guests had stayed the night in the east wing. Each one had a reason to want Harold Price dead. Morris pulled out his notebook and began writing careful notes. Tonight would be long, but the truth always surfaces eventually.
created_at
"2026-02-24T22:41:34.351Z"
2/24/2026, 10:41:34 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1605
moderation_latency
155
generation_time
16188
tokens_prompt
46
tokens_completion
757
native_tokens_prompt
61
native_tokens_completion
1313
native_tokens_completion_images
(null)
native_tokens_reasoning
537
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
0.03313
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"a88dfbba-eb3d-4820-ba00-60e981bcc717"
is_byok
false
latency
1518
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771972894-gbUaECVbkbHWmGE9H1ax"
upstream_id
"a88dfbba-eb3d-4820-ba00-60e981bcc717"
total_cost
0.03313
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
15
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10