NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-25-01KYCRCSR8FBQ9CDHZVV9V9BMT
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
20.3s
Cost:
$0.046975
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. Detective Mara Voss stepped over the threshold and stopped breathing. The orchids had been arranged around him with obvious care. Nine white blooms, one for each finger he still had. Ambrose Whitlock, seventy-one, lay dressed for a formal dinner party. His dinner jacket was pressed, his shoes polished to mirrors. Someone had folded his hands across his chest like prayer. Mara crouched, knees protesting, and studied the dead man's face. He looked less surprised than a murdered man should look. Behind her, Constable Pike was trying not to be sick. The gardener found him at six, watering the tomato beds. Nobody else in the house admits hearing anything last night. Mara studied the glass walls, every one of them intact. The door had been locked from inside with a key. That key now sat in the dead man's jacket pocket. Somewhere in this house, someone was keeping the tenth flower. Rain kept falling, and the orchids kept their white silence.
created_at
"2026-07-25T13:45:50.096Z"
7/25/2026, 1:45:50 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4330
moderation_latency
(null)
generation_time
20215
tokens_prompt
46
tokens_completion
425
native_tokens_prompt
60
native_tokens_completion
1867
native_tokens_completion_images
(null)
native_tokens_reasoning
171
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
0.046975
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsrRrRYwBamZNxQ61TN"
is_byok
false
latency
1185
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-1784987150-PpZro95EYDEBACa0JXFM"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987150-DXlrMn8i4Ymzy1Xxc8zy"
upstream_id
"msg_011CdNsrRrRYwBamZNxQ61TN"
total_cost
0.046975
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
17
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
14
10
15
10
16
10