NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-01-01KWE972MQP72G3TFXKSZGTC9V
Run Details
Model:
Claude Sonnet 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
46.4s
Cost:
$0.064330
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 eerily silent beneath a heavy gray sky, cold rain hammering steadily against its ancient glass windows. Detective Sarah Chen stepped carefully through the grand entrance, her flashlight cutting slowly through the thick musty darkness before her. A body lay motionless at the base of the grand sweeping marble staircase, dark blood pooling slowly across the floor. Sarah immediately recognized the fallen victim as Charles Whitmore, the reclusive millionaire who had owned this vast, isolated grand estate. Three nervous suspects waited quietly in the adjacent study, each one completely avoiding the detective's own probing, suspicious, sharp gaze. Somewhere within these cold, silent stone walls, Sarah knew, the killer patiently waited for her very next single wrong move.
created_at
"2026-07-01T07:27:39.173Z"
7/1/2026, 7:27:39 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3846
moderation_latency
(null)
generation_time
46322
tokens_prompt
46
tokens_completion
654
native_tokens_prompt
60
native_tokens_completion
6421
native_tokens_completion_images
(null)
native_tokens_reasoning
455
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
0.06433
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_013n6yaZS4xH7fEj8vh6riC4"
is_byok
false
latency
1803
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-1782890859-CcqVHNY1CHfPL4bAOI6I"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782890859-U8p8x8XbVnZZw9Ul46NW"
upstream_id
"msg_013n6yaZS4xH7fEj8vh6riC4"
total_cost
0.06433
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