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Run: 2026-02-24-01KJ8WHXXWWGSAWV3N1YPGDXG4
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
39.1s
Cost:
$0.077680
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 body lay crumpled at the foot of the grand staircase, a single red rose clutched in her left hand. Detective Maria Vasquez ducked beneath the yellow crime scene tape and studied the body with her sharp, quiet, unforgiving eyes. The mansion had hosted a lavish party the night before, and now its marble halls echoed only with grieving silence. No one had heard a scream, or so they claimed, yet the walls of this old house were remarkably thin. The victim was Eleanor Ashworth, the sole heiress to a shipping fortune and beloved wife of the man weeping downstairs. Her silk gown was torn at the shoulder, and a bruise darkened her throat like the shadow of something terrible. Vasquez knelt beside the body and noticed that Eleanor's emerald necklace was missing, though its clasp still marked her skin. Someone at that party had wanted Eleanor dead, and Vasquez intended to find out which of them had done it. She stood, brushed off her coat, and turned to face the twelve shaken guests waiting in the dim drawing room. Each of them had motive, and before this long night was over, she would make certain the truth came out.
created_at
"2026-02-24T22:33:12.899Z"
2/24/2026, 10:33:12 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1534
moderation_latency
174
generation_time
38807
tokens_prompt
46
tokens_completion
781
native_tokens_prompt
61
native_tokens_completion
3095
native_tokens_completion_images
(null)
native_tokens_reasoning
481
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
0.07768
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"b5308f0a-3aa9-4aad-9395-b3a92747a0cb"
is_byok
false
latency
1387
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771972392-jk02cpoDD71dGUxzNp9f"
upstream_id
"b5308f0a-3aa9-4aad-9395-b3a92747a0cb"
total_cost
0.07768
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