NC Bench
Overview
About
Tests
Models
Vendors
Compare
Run: 2026-02-24-01KJ8V04Z53MG2Z40B4B4587AP
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
30.2s
Cost:
$0.078580
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 mansion stood silent at the end of Blackwood Lane, its tall windows dark against the pale morning sky. Detective Clara Marsh ducked beneath the yellow tape and stepped through the front door, her badge catching the dim light. The body lay crumpled at the foot of the grand staircase, one pale hand still reaching toward the railing above. No blood was visible anywhere on the marble floor, which made the entire scene feel eerily wrong to her eyes. A shattered wine glass rested near the victim's left hand, the dark red liquid pooled across the cold white tiles. She knelt beside the dead man and noticed the faintest trace of something purple staining the corners of his lips. His name was Edward Holloway, the wealthiest man in the county, and someone in this house had wanted him dead. Clara stood slowly and scanned the shadowed foyer, knowing that the killer had likely been someone the victim trusted completely. Upstairs, a floorboard creaked, and every officer in the room froze, their hands instinctively moving to rest on their weapons. Clara raised a finger to her lips and moved toward the staircase, each step bringing her closer to the truth.
created_at
"2026-02-24T22:06:01.712Z"
2/24/2026, 10:06:01 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1384
moderation_latency
228
generation_time
29918
tokens_prompt
46
tokens_completion
644
native_tokens_prompt
61
native_tokens_completion
3131
native_tokens_completion_images
(null)
native_tokens_reasoning
335
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
0.07858
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"ec7760fc-b1b5-4192-a8b8-3973aff06c41"
is_byok
false
latency
1351
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771970761-yxJl8TwccIuxs5vmE9k0"
upstream_id
"ec7760fc-b1b5-4192-a8b8-3973aff06c41"
total_cost
0.07858
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