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Run: 2026-07-01-01KWEABJ6QPCM5AB5RTFGJ8ZB0
Run Details
Model:
Claude Sonnet 5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.5s
Cost:
$0.004650
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
0.00%
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 Last Guest Rain hammered the windows of Blackwood Manor as thunder rolled across the darkened valley below. Detective Elena Marsh pulled her coat tighter, stepping carefully across the gravel driveway toward the entrance. The butler, pale and trembling, waited at the door with an unlit lantern in hand. "She's in the library," he whispered, his voice barely audible above the storm outside. Elena nodded once and followed him through corridors lined with portraits of scowling ancestors. The air smelled of old wood, cigar smoke, and something faintly metallic beneath it. Lord Ashford's body lay slumped across his mahogany desk, blood pooling on papers. His eyes stared blankly at the ceiling, frozen in an expression of pure terror. Seven guests remained in the manor, each with secrets worth killing to protect. The storm had knocked out the phone lines hours before anyone noticed the murder. No one could leave until morning, trapped with a killer among them. Elena knelt beside the body, examining the peculiar wound just above his collar. "This wasn't a simple robbery," she muttered, noting the missing signet ring. Someone in this house had planned this murder with meticulous, chilling precision. She stood slowly, turning to face the nervous crowd gathering in the doorway. "One of you," she said quietly, "is a murderer."
created_at
"2026-07-01T07:47:34.758Z"
7/1/2026, 7:47:34 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1602
moderation_latency
(null)
generation_time
8480
tokens_prompt
46
tokens_completion
337
native_tokens_prompt
60
native_tokens_completion
453
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)
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
0.00465
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01DbrS4fmHnHaxbkfL9gtBeT"
is_byok
false
latency
1602
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-1782892054-w4idSbJy39dN7UyJdoht"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782892054-xfRDij9alXKvxdgGx5oK"
upstream_id
"msg_01DbrS4fmHnHaxbkfL9gtBeT"
total_cost
0.00465
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
0.00%
Matches word count
n/a
neededClean
false
sentences
17
wordCounts
0
4
1
15
2
16
3
15
4
14
5
14
6
14
7
13
8
14
9
13
10
14
11
12
12
13
13
12
14
12
15
13
16
9