NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-25-01KYCQZGJQ8G4R4HVTCQ807RKA
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
17.9s
Cost:
$0.040650
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 glass roof of Thornfield Hall's east conservatory. Inspector Maren Vale arrived at seven, twelve minutes after dawn. The body lay among orchids, arranged with unsettling, deliberate care. Someone had folded his hands across his chest like prayer. Sir Edmund Ashcombe, sixty-three, philanthropist, collector, and father of four. A single orchid bloom rested where his heart should beat. Maren crouched, studying the petals, white flecked with dried blood. The wound was small, precise, entered just below the ribs. No struggle, no defensive marks, no overturned pots or soil. He knew whoever killed him, and he trusted them completely. Behind her, the housekeeper wept into a starched linen napkin. Six family members waited in the drawing room, saying nothing. The doors had been locked from inside since eleven o'clock. Maren straightened slowly and pulled her damp coat closed tighter. Someone in this house had murdered a man they loved.
created_at
"2026-07-25T13:38:34.719Z"
7/25/2026, 1:38:34 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5970
moderation_latency
(null)
generation_time
17839
tokens_prompt
46
tokens_completion
397
native_tokens_prompt
60
native_tokens_completion
1614
native_tokens_completion_images
(null)
native_tokens_reasoning
156
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
0.04065
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsJLhUX2dn3ZTb1PCQT"
is_byok
false
latency
1907
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-1784986714-Pfy5nCjErholCmvMnBIW"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986714-JnScWtRH78tHtSyJPsoq"
upstream_id
"msg_011CdNsJLhUX2dn3ZTb1PCQT"
total_cost
0.04065
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
15
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