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Run: 2026-02-24-01KJ8X0EYATJWP4333KDGB9XEJ
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
34.1s
Cost:
$0.074330
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, still wearing the evening gown from last night's party. Detective Maria Santos ducked beneath the yellow tape and studied the scene with her sharp, practiced, and ever-observant dark eyes. The victim was Eleanor Ashworth, heiress to a vast fortune and host of the infamous charity gala held each December. No one had heard her fall, though dozens of guests had been sleeping in the mansion's many lavish guest rooms. A single crimson rose rested on the bottom step beside her outstretched hand, its petals still fresh and impossibly bright. Santos knelt down and noticed the faint bruising around Eleanor's neck, which the carefully draped silk scarf had nearly concealed. This was no accident, she whispered to her partner, who stood pale and trembling just beyond the marble foyer entrance. Somewhere above them, behind one of fourteen closed doors, a killer was waiting and pretending to sleep through the morning. The grandfather clock in the hallway struck seven, its deep chime echoing through the silent house like a mournful confession. Santos pulled on her gloves and began the grim work of unraveling the last terrible hours of Eleanor Ashworth's life.
created_at
"2026-02-24T22:41:09.074Z"
2/24/2026, 10:41:09 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2225
moderation_latency
155
generation_time
33835
tokens_prompt
46
tokens_completion
667
native_tokens_prompt
61
native_tokens_completion
2961
native_tokens_completion_images
(null)
native_tokens_reasoning
360
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
0.07433
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"b2c76022-30eb-48a3-9b9c-cfb1bae4e71c"
is_byok
false
latency
2225
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771972869-66c6us6KPwcNftLB65Bd"
upstream_id
"b2c76022-30eb-48a3-9b9c-cfb1bae4e71c"
total_cost
0.07433
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