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Run: 2026-07-01-01KWE925TTWSHJB56AWP80QNNQ
Run Details
Model:
Claude Sonnet 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
31.6s
Cost:
$0.044870
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 fell steadily against the tall windows of Blackwood Manor as the old clock struck midnight in the silent hall. Detective Elena Marsh stood quietly beside the crackling fireplace, carefully studying the scattered papers on the mahogany desk before her. The lifeless body of Lord Ashford lay motionless upon the antique rug, his cold eyes staring blankly toward the ceiling. A single silver letter opener protruded from his chest, glinting faintly beneath the dim, flickering candlelight above the old desk. Elena knelt slowly beside the cold corpse, carefully noting the strange absence of any struggle, blood, or forced entry there. Only a faint, bitter scent of almonds lingered in the cold night air, hinting strongly at poison rather than blade. She rose slowly to her feet and turned toward the heavy, closed oak door, sensing someone still lingered just nearby.
created_at
"2026-07-01T07:24:58.599Z"
7/1/2026, 7:24:58 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3750
moderation_latency
(null)
generation_time
31554
tokens_prompt
46
tokens_completion
464
native_tokens_prompt
60
native_tokens_completion
4475
native_tokens_completion_images
(null)
native_tokens_reasoning
246
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
0.04487
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01UpFW6vgS497k3cP6h3AhQi"
is_byok
false
latency
2209
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-1782890698-a55QPn1ISUmzUpUflhRe"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782890698-XQ1gpqBtJKSSldQobjH6"
upstream_id
"msg_01UpFW6vgS497k3cP6h3AhQi"
total_cost
0.04487
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20