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Run: 2026-07-01-01KWE8WSV3HVZ2YNJ2FWZVZ4D7
Run Details
Model:
Claude Sonnet 5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
6.0s
Cost:
$0.003040
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
63.96%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
# The Last Guest Rain hammered the old mansion's windows without any mercy. Detective Sarah Chen arrived just after midnight that night. The butler waited nervously at the towering front door. "Something terrible has happened," he whispered, his hands trembling. Sarah nodded and stepped inside, removing her wet coat. The grand foyer smelled faintly of gunpowder and roses. Seven guests sat silently in the adjacent dark parlor. Each one avoided eye contact, staring at the floor. The host lay dead beside his antique mahogany desk. A single bullet wound marked his otherwise pristine forehead. Sarah scanned the room, noting every small detail carefully. Nobody had heard the gunshot during the storm. The killer, she realized, was still in this house. She pulled out her notebook and cleared her throat. "No one leaves until I solve this murder."
created_at
"2026-07-01T07:22:02.481Z"
7/1/2026, 7:22:02 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1522
moderation_latency
(null)
generation_time
5958
tokens_prompt
46
tokens_completion
214
native_tokens_prompt
60
native_tokens_completion
292
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
0.00304
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_017mjovn491VurbZh8oXe7vA"
is_byok
false
latency
1522
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-1782890522-Kr4lgKNgZMsEzdPIg1Gx"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782890522-Jm3ibVXJL7Q0RGlCGUIb"
upstream_id
"msg_017mjovn491VurbZh8oXe7vA"
total_cost
0.00304
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
63.96%
Matches word count
n/a
neededClean
false
sentences
16
wordCounts
0
4
1
9
2
9
3
9
4
9
5
9
6
9
7
9
8
9
9
9
10
9
11
9
12
8
13
9
14
9
15
8