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Run: 2026-02-18-01KHQ944ZBRHEPJ4YNZ2SJKJ0V
Run Details
Model:
Claude Sonnet 4.6
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.2s
Cost:
$0.003822
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
37.09%
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 lighthouse stood silent at the edge of town, its beam cutting through the thick November fog. Detective Clara Morse arrived at the scene just after midnight, her breath forming small clouds in the cold air. She stepped carefully over the threshold, noting the broken glass scattered across the worn wooden floorboards beneath her boots. A body lay face down near the spiral staircase, one arm stretched toward something nobody could yet identify. Sergeant Webb approached from behind, his flashlight sweeping slowly across the damp stone walls surrounding the terrible scene. Clara knelt beside the victim, a middle-aged man dressed in an expensive charcoal suit and polished leather shoes. There were no obvious signs of struggle, which unsettled her far more than any overturned furniture ever could. She noticed a single red rose placed deliberately beneath his outstretched hand, its petals still impossibly fresh and bright. Someone had wanted this body discovered, staged with careful intention for the first person who dared come inside. Clara stood slowly, her eyes moving upward toward the winding staircase, sensing the killer had not yet truly gone.
created_at
"2026-02-18T02:26:39.78499+00:00"
2/18/2026, 2:26:39 AM
model
"anthropic/claude-4.6-sonnet-20260217"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
580
moderation_latency
191
generation_time
5951
tokens_prompt
46
tokens_completion
299
native_tokens_prompt
44
native_tokens_completion
246
native_tokens_completion_images
(null)
native_tokens_reasoning
0
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
0.003822
router
(null)
provider_responses
0
id
"5919f599-5c72-4caf-9d2d-5a7fd696ec1a"
status
200
is_byok
false
latency
580
endpoint_id
"83d802cb-44f2-45a0-a9d5-cb9bf79777c8"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.6-sonnet-20260217"
api_type
"completions"
id
"gen-1771381593-AjIUp4dJeOOcg6PuYAEN"
upstream_id
"5919f599-5c72-4caf-9d2d-5a7fd696ec1a"
total_cost
0.003822
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
37.09%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
18
1
19
2
19
3
18
4
18
5
19
6
18
7
19
8
18
9
19