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Run: 2026-07-01-01KWEAC9NGZY9E1RXVRADEQ7VK
Run Details
Model:
Claude Sonnet 5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
7.4s
Cost:
$0.003270
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
45.59%
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 Opening Rain hammered the old mansion's windows late that night. Detective Sarah Marsh arrived just after the storm began. The butler stood frozen, pale-faced, at the front entrance. "He's dead," he whispered, pointing toward the study door. Marsh entered slowly, noting every detail around her. Lord Ashford lay sprawled across his mahogany desk. A silver letter opener protruded from his chest. Blood had pooled dark against the antique wood grain. Six guests waited nervously in the adjoining parlor room. Someone in this house had committed cold-blooded murder. Marsh straightened her coat and began asking questions. "Nobody leaves," she said, "until I find answers." The clock on the mantel struck exactly midnight then. Outside, thunder rolled across the darkened countryside grounds. Tonight, someone's carefully constructed lies would finally unravel. The killer was still hiding somewhere in this house.
created_at
"2026-07-01T07:47:58.778Z"
7/1/2026, 7:47:58 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2421
moderation_latency
(null)
generation_time
7362
tokens_prompt
46
tokens_completion
232
native_tokens_prompt
60
native_tokens_completion
315
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
0.00327
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_013E17wBQmScmEFgeawtL1ZX"
is_byok
false
latency
2421
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-1782892078-gVOpda9qA2HVozBAft1j"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782892078-tT48JPQ0mpG2jXePGKxn"
upstream_id
"msg_013E17wBQmScmEFgeawtL1ZX"
total_cost
0.00327
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
45.59%
Matches word count
n/a
neededClean
false
sentences
16
wordCounts
0
3
1
9
2
9
3
9
4
9
5
8
6
8
7
8
8
9
9
9
10
8
11
8
12
17
13
8
14
8
15
9