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Run: 2026-02-24-01KJ8V6ASZDEJJVKANTY1EE7FZ
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
21.7s
Cost:
$0.030630
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 crumpled beneath the old oak tree outside. Detective Harris arrived at the scene just after midnight fell. Rain had washed away most of the useful evidence already. A single red rose rested gently in the victim's hand. No one in this quiet town expected murder to visit. The victim was Eleanor Chase, beloved owner of the bakery. Her eyes stared upward, frozen in a look of surprise. Harris knelt beside her and noticed bruises on her neck. Someone had wanted Eleanor dead, and they had succeeded tonight. The nearest neighbor lived almost half a mile from here. No witnesses meant the case would be difficult to crack. Harris pulled out his notebook and began writing careful notes. Somewhere in this darkness, a killer was walking away free.
created_at
"2026-02-24T22:09:24.297Z"
2/24/2026, 10:09:24 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1371
moderation_latency
119
generation_time
21545
tokens_prompt
46
tokens_completion
461
native_tokens_prompt
61
native_tokens_completion
1213
native_tokens_completion_images
(null)
native_tokens_reasoning
261
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
0.03063
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"4f984eb0-9f70-4985-93f9-0100ec931c6b"
is_byok
false
latency
1288
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771970964-NMlPu1wnxkRB0vp2HmNp"
upstream_id
"4f984eb0-9f70-4985-93f9-0100ec931c6b"
total_cost
0.03063
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
13
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