NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-25-01KYCRFK5GHM45TVNDVVPHH0TG
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
32.9s
Cost:
$0.076575
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 rain had been falling on Ashcombe since Tuesday, and by Friday morning the river had swallowed the old footbridge. Detective Inspector Nora Vale parked beside the churchyard wall and sat there listening to water drum against the car roof. Somebody had found a body in the flooded meadow, and somebody else had already told every soul in the village. Twenty umbrellas crowded the narrow lane above the still water, black and shining like beetles gathered around something newly dead. Nora pushed through them, holding up her warrant card, saying nothing, and the wet murmuring closed up behind her again. The dead man lay face up in eight inches of brown water, wearing a good dinner jacket and no shoes. His hands were folded on his chest, arranged, as though someone had truly wanted him to look properly at peace. Nora crouched, feeling the cold seep through her trousers, and studied the very small neat hole above his left eyebrow. Behind her, a young constable said the name Edward Ashcombe aloud, and the whole village seemed to hold its breath. Rain kept falling, patient and thorough, washing away whatever evidence the killer had carelessly left behind in the wet grass.
created_at
"2026-07-25T13:47:21.658Z"
7/25/2026, 1:47:21 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3857
moderation_latency
(null)
generation_time
32782
tokens_prompt
46
tokens_completion
752
native_tokens_prompt
60
native_tokens_completion
3051
native_tokens_completion_images
(null)
native_tokens_reasoning
449
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
0.076575
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsyBbNmhriXvDKNRnsM"
is_byok
false
latency
1283
model_permaslug
"anthropic/claude-opus-5-20260723"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer
(null)
request_id
"req-1784987241-uRJbnsDi80SolGHumCO7"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987241-RR8qygpkh2TAHBWseasd"
upstream_id
"msg_011CdNsyBbNmhriXvDKNRnsM"
total_cost
0.076575
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
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20