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Run: 2026-02-24-01KJ8V73TZ2RMP6V1XTVYFGD08
Run Details
Model:
Claude Sonnet 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1m 55s
Cost:
$0.200763
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
Detective Clara Marsh stepped out of her car and immediately noticed the front door of Thornfield Manor was wide open. The bitter rain was falling in thick relentless sheets that drummed hard against the old stone walls of the manor. She stepped cautiously through the wide open doorway and carefully shone her flashlight into the still and silent entrance hall. It was then that she saw the body of Lord Edmund Ashworth, crumpled silently at the foot of the staircase. He was lying face down on the cold marble floor, with one arm stretched forward as if reaching for something. A dark and wide stain had pooled beneath his body, creeping between the pale grout lines of the marble tiles. Lord Ashworth had been hosting his annual dinner party that night, and nine invited guests had all supposedly been present. Detective Marsh crouched beside the body and scanned the room, already certain that nothing about this scene was an accident. From somewhere deep within the dim manor, behind one of the many closed and heavy oak doors, a floorboard creaked. The murderer, she suddenly realized with a slow and dawning certainty, was still somewhere inside this sprawling and darkened manor. Every last one of them, Marsh now understood with grim and sickening dread, was a potential suspect in this murder.
created_at
"2026-02-24T22:09:49.937Z"
2/24/2026, 10:09:49 PM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
633
moderation_latency
289
generation_time
114706
tokens_prompt
46
tokens_completion
1340
native_tokens_prompt
61
native_tokens_completion
13372
native_tokens_completion_images
(null)
native_tokens_reasoning
1014
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
0.200763
router
(null)
provider_responses
0
endpoint_id
"83d802cb-44f2-45a0-a9d5-cb9bf79777c8"
id
"cff52722-08b4-4b2c-b205-8f42d2b04246"
is_byok
false
latency
633
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771970989-Nrz1rHoWhDEpbQplm1ce"
upstream_id
"cff52722-08b4-4b2c-b205-8f42d2b04246"
total_cost
0.200763
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
11
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20
10
20