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Run: 2026-02-24-01KJ8WW0EB4SPNWA1ZAZP9BJVK
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
28.6s
Cost:
$0.046905
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 Sarah Mills arrived at the scene before dawn broke. She knelt beside the victim and studied his pale face. No wallet or identification could be found on the man. A single red rose had been placed upon his chest. Its thorns had drawn tiny drops of blood from him. Rain began to fall, threatening to wash away the evidence. She pulled her collar up and surveyed the quiet street. Every house was dark except for one across the road. Behind that window, someone was watching her through the curtains. She made a mental note to knock on that door. But first she needed to understand what happened right here. The killer had left a message carved into the bark. It read simply: you should have kept your mouth shut. This was not a random act of violence at all. Someone in this quiet town had a very dark secret.
created_at
"2026-02-24T22:38:43.154Z"
2/24/2026, 10:38:43 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1773
moderation_latency
150
generation_time
28362
tokens_prompt
46
tokens_completion
479
native_tokens_prompt
61
native_tokens_completion
1864
native_tokens_completion_images
(null)
native_tokens_reasoning
258
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
0.046905
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"96b80862-2891-4be3-8348-5064ba171f80"
is_byok
false
latency
1679
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771972723-tan7sEp2GQd0LAJh4YRg"
upstream_id
"96b80862-2891-4be3-8348-5064ba171f80"
total_cost
0.046905
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
16
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
15
10