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Run: 2026-07-01-01KWE8W75YGCYKA5ZG45W70GQM
Run Details
Model:
Claude Sonnet 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
30.5s
Cost:
$0.040170
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 pounded hard against the mansion's tall windows as Detective Sarah Chen quietly entered the dim, silent, empty hallway tonight. A woman's lifeless body lay sprawled motionless across the cold, polished marble floor near the grand, curving staircase below tonight. Chen knelt slowly beside the corpse, carefully noticing a single, crimson rose clutched tightly within her pale, cold hand there. The victim, identified quickly as wealthy socialite Margaret Ashford, had apparently been dead for several long, agonizing hours already tonight. Chen suspected instinctively that this brutal murder was only the beginning of something far darker, more sinister, and yet unknown.
created_at
"2026-07-01T07:21:43.367Z"
7/1/2026, 7:21:43 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4665
moderation_latency
(null)
generation_time
30512
tokens_prompt
46
tokens_completion
661
native_tokens_prompt
60
native_tokens_completion
4005
native_tokens_completion_images
(null)
native_tokens_reasoning
491
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
0.04017
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01P3D7y85Hwm6AgxVYYjg3Dd"
is_byok
false
latency
2207
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-1782890503-maLvmNpKykcJSn5GO77E"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782890503-cu65uoi7TryQVY8LqmBk"
upstream_id
"msg_01P3D7y85Hwm6AgxVYYjg3Dd"
total_cost
0.04017
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
5
wordCounts
0
20
1
20
2
20
3
20
4
20