NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-25-01KYCRHXHJBPS64B5Q389XBSVJ
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
16.3s
Cost:
$0.037900
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain hammered the greenhouse roof like impatient fingers on glass. Inspector Naomi Vale stopped just inside the fogged glass door. The air smelled of wet soil, crushed orchids, and copper. Beneath the tallest fern lay Hollis Grange, quite thoroughly dead. His left hand still gripped a pair of pruning shears. His right hand held nothing, which struck her as odd. Someone had arranged white roses carefully across his open eyes. Naomi crouched, avoiding the dark pool spreading toward her boots. Behind her, the young constable made a small wounded noise. Breathe through your mouth, she said, and do not vomit. Outside, six houseguests waited in a warm, brightly lit parlor. One of them had walked through this rain quite recently. Muddy footprints led from the door and back out again. Naomi stood, straightened her coat, and went to ask questions.
created_at
"2026-07-25T13:48:37.822Z"
7/25/2026, 1:48:37 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3611
moderation_latency
(null)
generation_time
16188
tokens_prompt
46
tokens_completion
417
native_tokens_prompt
60
native_tokens_completion
1504
native_tokens_completion_images
(null)
native_tokens_reasoning
204
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
0.0379
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNt4oHMqhEtbuSUoWJZk"
is_byok
false
latency
1208
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-1784987317-F9BBdPqt1zVRg2UuC0lp"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987317-hfHRGZm71Q3Xz4eR7rHf"
upstream_id
"msg_011CdNt4oHMqhEtbuSUoWJZk"
total_cost
0.0379
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
14
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10