NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-25-01KYCRJVJRTWZ7NNWCCS50273S
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
15.4s
Cost:
$0.027450
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The rain started at midnight. Inspector Hale hated wet shoes. The body lay face down. Blood pooled beneath the roses. Someone had arranged them carefully. Twelve stems, each thorn removed. Hale crouched in the mud. The dead man wore silk. She recognized him immediately: Ashgrove. His watch had stopped working. Eleven forty-seven, the hands insisted. Rain drummed against her umbrella. A constable approached, notebook trembling. Nobody heard anything, he said. Hale did not believe him. Somebody always hears the screaming. The house watched them silently. Nine windows, every curtain drawn. Except one upstairs, left open. Hale wrote that down twice. Then she went inside alone.
created_at
"2026-07-25T13:49:08.576Z"
7/25/2026, 1:49:08 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4402
moderation_latency
(null)
generation_time
15302
tokens_prompt
46
tokens_completion
305
native_tokens_prompt
60
native_tokens_completion
1086
native_tokens_completion_images
(null)
native_tokens_reasoning
134
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
0.02745
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNt75v3DY7XTyhDtNkfn"
is_byok
false
latency
1883
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-1784987348-u2SHtyKJGkazUMyotxbT"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987348-HeXKayK0FzRw5qldmZ8G"
upstream_id
"msg_011CdNt75v3DY7XTyhDtNkfn"
total_cost
0.02745
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
21
wordCounts
0
5
1
5
2
5
3
5
4
5
5
5
6
5
7
5
8
5
9
5
10
5
11
5
12
5
13
5
14
5
15
5
16
5
17
5
18
5
19
5
20
5