NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-01-01KWE9AAKSVB65XTD6WJKR2Z3C
Run Details
Model:
Claude Sonnet 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
27.7s
Cost:
$0.038850
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 manor, tapping softly against tall, dark windows like impatient, nervous fingers seeking quiet entry. Detective Mara Voss stood silently beneath the entrance, staring up at the crumbling, ancient stone facade above her tired head. Behind her, two uniformed officers waited quietly outside, their flashlights cutting narrow beams through the steadily falling cold night rain. Inside, someone had already discovered the body, and the entire old house had suddenly gone terribly, unnervingly silent again tonight. Mara slowly adjusted her damp coat, took one slow, steadying breath, and finally stepped through the heavy old oak door.
created_at
"2026-07-01T07:29:25.637Z"
7/1/2026, 7:29:25 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3896
moderation_latency
(null)
generation_time
27627
tokens_prompt
46
tokens_completion
417
native_tokens_prompt
60
native_tokens_completion
3873
native_tokens_completion_images
(null)
native_tokens_reasoning
251
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
0.03885
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01X8j5c1N4AHBcqqocybpaXs"
is_byok
false
latency
1871
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-1782890965-LzxQTFaIttfnYrUuawEC"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782890965-3upYUB9IPWC62Q52khjD"
upstream_id
"msg_01X8j5c1N4AHBcqqocybpaXs"
total_cost
0.03885
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
5
wordCounts
0
20
1
20
2
20
3
20
4
20