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Run: 2026-07-01-01KWE9DDSQXW4FBRN8HZDMESPH
Run Details
Model:
Claude Sonnet 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
33.8s
Cost:
$0.043080
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 old manor's tall windows as Detective Clara Voss stepped carefully across the dark, creaking wooden floor. A single candle flickered on the mahogany desk, casting long shadows across scattered papers and a tarnished silver letter opener. Lord Ashford lay motionless behind the heavy oak desk, his eyes staring blankly toward the cracked plaster ceiling above him. Detective Voss knelt quietly beside the body, carefully noting the deep crimson stain spreading slowly across his white silk shirt. Nothing else in the study seemed disturbed except for a single missing item: the ornate ruby ring he always wore. She glanced toward the open window, quietly noticing wet, muddy footprints leading out into the dark, silent, storm-soaked garden beyond. The storm outside seemed to whisper ancient secrets that only the killer, and the old manor itself, somehow truly understood.
created_at
"2026-07-01T07:31:07.201Z"
7/1/2026, 7:31:07 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3880
moderation_latency
(null)
generation_time
33774
tokens_prompt
46
tokens_completion
628
native_tokens_prompt
60
native_tokens_completion
4296
native_tokens_completion_images
(null)
native_tokens_reasoning
403
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
0.04308
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01EnkkEWL9qATBvqWmW97sU3"
is_byok
false
latency
1581
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-1782891067-ncv1yE4k7QxyAem7gfob"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891067-nHWGreDH0WS6RUQkAYtx"
upstream_id
"msg_01EnkkEWL9qATBvqWmW97sU3"
total_cost
0.04308
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