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Run: 2026-07-01-01KWE91KNDJ9YTNX7FMCFY2VX9
Run Details
Model:
Claude Sonnet 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
35.4s
Cost:
$0.048950
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 over the old stone manor, drumming softly against tall dark windows like cold fingers tapping for entry. Detective Mara Voss stood quietly beneath the dripping eaves, staring intently up at the dimly lit old study window above. Inside, Lord Ashworth lay motionless across his mahogany desk, a silver letter opener protruding deep from his cold, still chest. His eyes remained wide open, fixed permanently on the ceiling as if startled badly by something entirely unseen nearby, waiting. Voss knelt slowly beside the body, carefully noting the absence of struggle or disturbed furniture in the quiet, dim room. Whoever had done this terrible thing, she thought grimly, had known this old house intimately, and had left no trace. Somewhere within this rain-soaked old manor, the killer was surely watching closely, waiting to see what she would discover next.
created_at
"2026-07-01T07:24:39.995Z"
7/1/2026, 7:24:39 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4304
moderation_latency
(null)
generation_time
35295
tokens_prompt
46
tokens_completion
481
native_tokens_prompt
60
native_tokens_completion
4883
native_tokens_completion_images
(null)
native_tokens_reasoning
262
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
0.04895
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01JdyojboonoHeZY9rR9ukoM"
is_byok
false
latency
2347
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-1782890680-UUsfCCkN4jOINMsocHx7"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782890680-9c6BeUf8MJUBA7Ym2bi3"
upstream_id
"msg_01JdyojboonoHeZY9rR9ukoM"
total_cost
0.04895
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