NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-25-01KYCQPRDTYDD84MAM2QHM9E8F
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
18.4s
Cost:
$0.038725
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
The old lighthouse keeper found her body at low tide. She lay face down among the mussels and broken glass. Her red coat had darkened to the color of rust. Gulls circled overhead, patient and screaming their small hungry complaints. Detective Inspector Maren Volk arrived twenty minutes after the call. She had not slept, and the coffee had gone cold. The village behind her held four hundred and nine people. One of them had done this, she thought, quite calmly. The keeper stood apart, hands shoved deep in his pockets. He said he had touched nothing, but that was untrue. Wet sand keeps its secrets badly; his footprints ringed her. Maren knelt beside the dead woman and studied her face. She knew this face; everyone in Harrowfleet knew this face. Elin Marsh had promised to ruin them all by Christmas. Someone, it seemed, had decided not to wait that long.
created_at
"2026-07-25T13:33:47.984Z"
7/25/2026, 1:33:47 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4267
moderation_latency
204
generation_time
17826
tokens_prompt
46
tokens_completion
403
native_tokens_prompt
60
native_tokens_completion
1537
native_tokens_completion_images
(null)
native_tokens_reasoning
185
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
0.038725
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNrwDkgXEsqwHXUXRT9n"
is_byok
false
latency
1318
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-1784986428-aEdGQLamdzB9FTTblKCd"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986428-4Im8lBamVh1jTV9dwj9F"
upstream_id
"msg_011CdNrwDkgXEsqwHXUXRT9n"
total_cost
0.038725
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