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Run: 2026-07-01-01KWE9KZ7BZ55JWHJJHNPGCA55
Run Details
Model:
Claude Sonnet 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
28.9s
Cost:
$0.036310
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 hammered against the tall windows of the old manor, drowning every sound except the distant rolling thunder far away. Inside, the grand hall stood silent, its usual warmth replaced by an unfamiliar, suffocating sense of quiet, creeping dread tonight. A single lamp flickered near the staircase, casting long, trembling shadows that seemed to move entirely on their own accord. Detective Elena Voss stepped quietly through the heavy doorway, her coat dripping wet, her sharp eyes scanning every corner instantly. She found the old butler waiting nervously near the fireplace, his hands trembling, his face pale as freshly fallen snow. "Lord Ashworth is dead," he whispered hoarsely, his voice barely audible above the fierce storm still raging outside the windows. Elena knelt quietly beside the cold body, already noticing a single, crimson rose resting deliberately upon his lifeless, silent chest.
created_at
"2026-07-01T07:34:41.654Z"
7/1/2026, 7:34:41 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3695
moderation_latency
(null)
generation_time
28870
tokens_prompt
46
tokens_completion
503
native_tokens_prompt
60
native_tokens_completion
3619
native_tokens_completion_images
(null)
native_tokens_reasoning
277
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
0.03631
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_012XG2GayYmvTnNsUny3Tnpb"
is_byok
false
latency
1678
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-1782891281-1vsjxX6iPOLTYTx0f5AK"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891281-LrEKxWMGbbc3CRHzQ47w"
upstream_id
"msg_012XG2GayYmvTnNsUny3Tnpb"
total_cost
0.03631
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20