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Run: 2026-07-01-01KWE8VTHSH0QAF69F7V2SSAZ6
Run Details
Model:
Claude Sonnet 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
53.6s
Cost:
$0.077960
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 relentlessly against the old mansion's tall, narrow windows as thunder rolled slowly across the darkened, silent valley below. Detective Sarah Miles stood motionless at the old threshold, staring silently into the room's oppressive, suffocating darkness ahead of her. A single candle flickered weakly upon the old mahogany desk, casting long, twisted shadows across the entire silent, empty room. There, sprawled awkwardly across the faded Persian rug, lay the lifeless, bloodied body of old Lord Ashford himself, utterly motionless. Blood pooled darkly beneath his silver head, glistening faintly in the flickering, slowly dying candlelight upon the old wooden floorboards. Detective Miles knelt slowly beside the corpse, carefully noting the peculiar bruising around his pale, thin, wrinkled neck and throat. No weapon lay nearby, only deep silence and the storm's persistent, eerie howl outside the tall, broken bedroom window pane. Someone within this grand old house, she realized grimly, had already gotten away with cold-blooded, calculated murder this very night.
created_at
"2026-07-01T07:21:30.433Z"
7/1/2026, 7:21:30 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5828
moderation_latency
(null)
generation_time
53520
tokens_prompt
46
tokens_completion
801
native_tokens_prompt
60
native_tokens_completion
7784
native_tokens_completion_images
(null)
native_tokens_reasoning
529
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
0.07796
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01SJBSQjZodi5f8hMjkeyDyE"
is_byok
false
latency
2612
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-1782890490-xJQuuqiRYm4a9dtaNeDm"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782890490-0UMypJn9WaadiSW80ZFL"
upstream_id
"msg_01SJBSQjZodi5f8hMjkeyDyE"
total_cost
0.07796
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20