NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-25-01KYCPW5NJP5JDNH60ZDCY0MC8
Run Details
Model:
Claude Opus 5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
12.1s
Cost:
$0.010825
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
77.07%
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
The rain had not stopped falling since Tuesday last week. Inspector Halloway stepped carefully around the puddle near the gate. Behind him, the constable held an umbrella at wrong angles. Water ran down the inspector's collar and soaked his shirt. The house ahead was tall, narrow, and painted a pale gray. Every window on the ground floor had been shuttered from inside. A woman waited at the door, hands folded, face perfectly still. "You are late," she said, though nobody had named a time. Halloway removed his hat and shook the rain onto the step. "Show me the room where you found him," he replied evenly. She turned without answering and walked into the dim front hall. The floorboards complained beneath her feet but stayed silent under his. Somewhere above them, a clock struck once for the half hour. The dead man lay beside the piano with his eyes open. Someone had folded his hands across his chest quite deliberately, neatly. Halloway crouched and looked for a long while at nothing much. "Who arranged him this way?" he asked the woman behind him. "He was like that when I came down," she said quietly. Halloway noted that she had not once looked at the body. Outside, the rain kept on falling as if paid handsomely for it.
created_at
"2026-07-25T13:19:16.663Z"
7/25/2026, 1:19:16 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4342
moderation_latency
(null)
generation_time
12031
tokens_prompt
46
tokens_completion
324
native_tokens_prompt
60
native_tokens_completion
421
native_tokens_completion_images
(null)
native_tokens_reasoning
0
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
0.010825
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNqq8EG4jhyfiffRYJNZ"
is_byok
false
latency
4294
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-1784985556-jePjL8BbFfrpycsLbqpW"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784985556-RQkP0SWFJuBUmqOJtIdB"
upstream_id
"msg_011CdNqq8EG4jhyfiffRYJNZ"
total_cost
0.010825
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
77.07%
Matches word count
n/a
neededClean
false
sentences
20
wordCounts
0
10
1
10
2
10
3
10
4
11
5
11
6
11
7
11
8
11
9
11
10
11
11
11
12
11
13
11
14
11
15
11
16
11
17
11
18
11
19
12