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Run: 2026-07-01-01KWE9AZEBR6PCN7Z5FTD2KKZN
Run Details
Model:
Claude Sonnet 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
40.3s
Cost:
$0.056360
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 mansion's tall windows as Detective Sarah Cole quietly stepped through the creaking wooden front door. The lifeless body lay motionless upon the cold polished marble floor, surrounded by shattered glass and scattered torn papers everywhere. Detective Cole immediately recognized the victim as wealthy local businessman Charles Whitmore, the owner of this grand sprawling countryside estate. A single, precise gunshot wound had marked his pale forehead, though no weapon could be found anywhere in the room. Cole immediately noticed that the antique grandfather clock upon the marble mantel had suddenly stopped precisely at exactly midnight tonight. Somewhere within this grand old country house, she instinctively knew, the very cunning killer was still watching and waiting patiently.
created_at
"2026-07-01T07:29:47.168Z"
7/1/2026, 7:29:47 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3872
moderation_latency
(null)
generation_time
40050
tokens_prompt
46
tokens_completion
648
native_tokens_prompt
60
native_tokens_completion
5624
native_tokens_completion_images
(null)
native_tokens_reasoning
444
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
0.05636
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_013McMa1Veg4gz2CmdhiV8Xb"
is_byok
false
latency
1712
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-1782890987-tHgU8EP34KYhJkCyY1bF"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782890987-a76BBpL0EEqWkgVOYBGn"
upstream_id
"msg_013McMa1Veg4gz2CmdhiV8Xb"
total_cost
0.05636
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
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20