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Run: 2026-02-24-01KJ8VYT5KSRWGG0NNPKK2763N
Run Details
Model:
Claude Sonnet 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
48.1s
Cost:
$0.082533
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 old manor house stood silent at the edge of Millbrook, its dark windows staring out into the stormy night. Detective Clara Haines stepped carefully out of her car and pulled her long coat tight against the biting October wind. The call had come in at midnight, a frantic housekeeper screaming about blood spreading across the library's expensive Persian rug. She had seen death many times before, but something about this particular cold October night felt deeply and terribly wrong. Two uniformed officers stood guard at the heavy front door, their pale faces lit by the cold yellow flashlight glow. Inside, the old sprawling house smelled of old money, burnt candles, and something darker that Clara could not quite name. The body of Lord Edmund Ashby lay face down in the very center of the vast room, arms outstretched wide. He was still dressed for dinner, his crisp white shirt now soaked entirely through with a deep and vivid crimson. Clara crouched beside the body and noticed, almost immediately, that all the room's doors had been locked from the inside. Whoever had killed Lord Ashby had either vanished into thin air or was still hiding somewhere within the dark manor.
created_at
"2026-02-24T22:22:46.461Z"
2/24/2026, 10:22:46 PM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
705
moderation_latency
186
generation_time
47798
tokens_prompt
46
tokens_completion
748
native_tokens_prompt
61
native_tokens_completion
5490
native_tokens_completion_images
(null)
native_tokens_reasoning
451
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
0.082533
router
(null)
provider_responses
0
endpoint_id
"83d802cb-44f2-45a0-a9d5-cb9bf79777c8"
id
"1d85160f-a22a-43bc-b645-362695e3ba50"
is_byok
false
latency
705
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771971766-E1oOrRgVOKKCayRQ8Gwk"
upstream_id
"1d85160f-a22a-43bc-b645-362695e3ba50"
total_cost
0.082533
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