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Run: 2026-07-01-01KWE9E77T7MS81XNAE6G8E99X
Run Details
Model:
Claude Sonnet 5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
9.9s
Cost:
$0.005920
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
0.07%
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 Manor at Midnight Rain hammered the windows of Blackwood Manor as thirteen guests gathered for dinner that fateful evening. Detective Harlow noticed how everyone avoided looking at the empty chair where their host should sit. Lady Winters clutched her pearls, glancing nervously toward the study door that remained firmly closed. The butler, Simmons, hadn't spoken since he discovered something terrible only twenty minutes earlier. Candles flickered across worried faces, casting shadows that seemed to dance with secrets nobody wanted revealed tonight. "Mr. Ashford will join us shortly," Simmons announced, though his trembling voice betrayed the obvious lie. Thunder cracked outside, rattling ancient windows that had witnessed countless family gatherings across three centuries. Nobody moved toward the study, yet everyone's eyes drifted repeatedly toward that ominous, unwelcoming door. Detective Harlow set down his wine glass, sensing danger coiled beneath polite conversation and formal manners. He'd been invited as a guest, not knowing murder would interrupt his quiet weekend retreat. The grandfather clock struck nine, its chimes echoing through halls suddenly heavy with dread. Miss Chen excused herself, claiming she needed fresh air despite the storm raging outside violently. Nobody believed her excuse, but nobody dared question what she might be hiding either. Finally, Harlow rose, walked deliberately toward the study, and grasped the cold brass handle. The door creaked open, revealing Ashford's lifeless body slumped across his mahogany desk ominously. Someone screamed behind him, but Harlow's mind had already begun untangling this house of secrets.
created_at
"2026-07-01T07:31:33.255Z"
7/1/2026, 7:31:33 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1634
moderation_latency
127
generation_time
9734
tokens_prompt
46
tokens_completion
422
native_tokens_prompt
60
native_tokens_completion
580
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
0.00592
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01SxebfUqngEmKwMo2i28pgf"
is_byok
false
latency
1630
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-1782891093-zgU2Ss5tk1X7L7h3uWnk"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891093-DQreL63PyABpEPpnPJXL"
upstream_id
"msg_01SxebfUqngEmKwMo2i28pgf"
total_cost
0.00592
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
0.07%
Matches word count
n/a
neededClean
false
sentences
17
wordCounts
0
5
1
16
2
16
3
15
4
14
5
17
6
16
7
15
8
15
9
16
10
15
11
14
12
15
13
14
14
14
15
14
16
15