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Run: 2026-07-01-01KWEA51Z76W6Z192P708NECJH
Run Details
Model:
Claude Sonnet 5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
10.5s
Cost:
$0.005380
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
0.06%
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
# The Fog on Wexford Lane Rain hammered the cobblestones outside Wexford Manor, drumming a rhythm that matched Detective Sarah Cole's racing heart. She'd received the anonymous call an hour ago, warning her something terrible had happened. The manor's gates stood open, swinging slowly on rusted hinges that hadn't moved in years. Inside, candlelight flickered through grimy windows, casting long shadows across the overgrown garden. Cole parked her car and stepped out, boots sinking into the muddy gravel path. She pulled her coat tighter, bracing against the wind that howled through ancient oak trees. The front door hung ajar, creaking softly as if inviting her forward. She drew her flashlight, its beam cutting through darkness thick with dust and secrets. The foyer smelled of decay, old wood, and something faintly metallic beneath it all. Cole's light found the staircase first, then the crumpled figure at its base. Lord Edmund Wexford lay motionless, his silk robe stained crimson beneath the chandelier. His eyes stared upward, frozen in an expression of pure, unadulterated terror. Cole knelt beside him, checking for a pulse she already knew wasn't there. Behind her, floorboards creaked, and she spun around, flashlight raised defensively. No one appeared, yet the temperature seemed to drop several unsettling degrees instantly. Somewhere upstairs, a clock chimed midnight, echoing through the house's hollow, waiting silence. Cole realized then this case would haunt her for years to come.
created_at
"2026-07-01T07:44:01.528Z"
7/1/2026, 7:44:01 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1904
moderation_latency
94
generation_time
10035
tokens_prompt
46
tokens_completion
379
native_tokens_prompt
60
native_tokens_completion
526
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
0.00538
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01TDuPwAAPHXzMqQfccBHpRg"
is_byok
false
latency
1904
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-1782891841-9xNtGIr2kszbqsnGSEms"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891841-ozf5dcLaVjbiECsfh5V0"
upstream_id
"msg_01TDuPwAAPHXzMqQfccBHpRg"
total_cost
0.00538
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
0.06%
Matches word count
n/a
neededClean
false
sentences
18
wordCounts
0
6
1
17
2
14
3
15
4
13
5
14
6
15
7
12
8
14
9
14
10
13
11
13
12
12
13
13
14
11
15
13
16
13
17
12