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Run: 2026-07-01-01KWE9EQ90DAK4FRNPCFDEGWGH
Run Details
Model:
Claude Sonnet 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
28.1s
Cost:
$0.036980
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
Rain fell steadily over the old mansion, soaking the gravel drive and darkening the ancient gray stone walls completely tonight. Detective Elena Marsh stepped out of her car, pulling her old coat tightly against the biting, freezing midnight wind outside. Inside the grand foyer, a lifeless body lay sprawled beneath the flickering light of an old crystal chandelier above him. The victim, a wealthy and respected businessman named Charles Whitfield, wore an expensive suit stained deeply with dark crimson blood. Elena knelt slowly beside him, noting the peculiar angle of his neck and the total absence of any visible weapon. She glanced slowly around the silent room, sensing that this quiet death held far darker secrets beneath its calm surface.
created_at
"2026-07-01T07:31:49.677Z"
7/1/2026, 7:31:49 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5099
moderation_latency
(null)
generation_time
28003
tokens_prompt
46
tokens_completion
438
native_tokens_prompt
60
native_tokens_completion
3686
native_tokens_completion_images
(null)
native_tokens_reasoning
250
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"end_turn"
service_tier
"default"
usage
0.03698
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01PnGrHN8sZQc3JL6eatmwwP"
is_byok
false
latency
2703
model_permaslug
"anthropic/claude-sonnet-5-20260630"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.17.0; linux; x64))"
http_referer
(null)
request_id
"req-1782891109-QtHjRPvNVmsG4Winp6uW"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891109-GkBW1vt5PBbfDNuMuNPl"
upstream_id
"msg_01PnGrHN8sZQc3JL6eatmwwP"
total_cost
0.03698
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
response_cache_source_id
(null)
data_region
"global"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20