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Run: 2026-07-01-01KWE8RKJD7FT9BXQWEQM4RXCD
Run Details
Model:
Claude Sonnet 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
32.9s
Cost:
$0.042420
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
The old mansion stood silent atop the hill, its windows dark, its doors locked tight against curious intruders this night. Detective Sarah Mills arrived just after midnight, stepping slowly and carefully over the rain-soaked gravel driveway toward the wide entrance. A single light flickered faintly in an upstairs window, the only sign that someone inside might still be awake there. The butler, Edmund Hayes, lay motionless at the foot of the grand marble staircase, blood slowly pooling beneath his body. Sarah knelt beside the body, her flashlight tracing the pale, lifeless face frozen in silent, unending terror and cold fear. Whoever had done this terrible thing, she quietly realized, was still somewhere close, watching every careful move she made tonight.
created_at
"2026-07-01T07:19:44.985Z"
7/1/2026, 7:19:44 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5966
moderation_latency
(null)
generation_time
32897
tokens_prompt
46
tokens_completion
496
native_tokens_prompt
60
native_tokens_completion
4230
native_tokens_completion_images
(null)
native_tokens_reasoning
304
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
0.04242
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01GLJzpbLEGbkLNMirrqSmEh"
is_byok
false
latency
3371
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-1782890384-XY6fMFlIzUnxPcenhfQE"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782890384-utvtoX60Szi2Ew5T21bu"
upstream_id
"msg_01GLJzpbLEGbkLNMirrqSmEh"
total_cost
0.04242
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
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20