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Run: 2026-07-01-01KWE9P42GNERM31TAFBBQ8RCJ
Run Details
Model:
Claude Sonnet 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
38.1s
Cost:
$0.054960
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 hammered relentlessly against the old manor's tall windows while lightning split the darkened sky above the distant, silent hills. Detective Sarah Voss stepped carefully out of her old car, collar raised high against the storm's biting, cold wind tonight. Two uniformed officers waited silently beneath the old porch light, their young faces betraying quiet, unmistakable dread and fear tonight. Inside, the victim lay sprawled across the cold marble floor, motionless beneath the grand, old, looming staircase's dark, silent shadow. Voss knelt slowly beside him, recognizing that pale, familiar face immediately despite all the years that had passed between them. This was certainly no ordinary murder case tonight; the dead man was truly her own former partner, Detective David Reyes.
created_at
"2026-07-01T07:35:52.155Z"
7/1/2026, 7:35:52 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3885
moderation_latency
141
generation_time
37886
tokens_prompt
46
tokens_completion
670
native_tokens_prompt
60
native_tokens_completion
5484
native_tokens_completion_images
(null)
native_tokens_reasoning
472
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
0.05496
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_011iZdLCnQqs4SsPkSUpoSbR"
is_byok
false
latency
1948
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-1782891352-Hh7ylRy68zka9TqzJnjo"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891352-mfpPjxFjwFK89Pxr5T45"
upstream_id
"msg_011iZdLCnQqs4SsPkSUpoSbR"
total_cost
0.05496
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