NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-25-01KYCQRHTDB3SZM3ZSBD4AFQG4
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
41.5s
Cost:
$0.088925
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The rain had been falling on Ashcombe Manor since Thursday, and by Sunday morning the long gravel drive resembled soup. Inspector Halloway parked beside the cracked fountain, turned off the engine, and sat listening to rain drumming on the roof. Someone had died inside that house, and everyone still breathing would probably spend the whole day lying to her face. The butler, a narrow man named Prentice, opened the door even before she had finished climbing the last stone step. He took her wet coat without comment, as though fresh corpses arrived at Ashcombe every second Sunday, shortly before lunch. Lord Ashcombe lay in the library, face down on the faded Persian carpet, a silver letter opener between his shoulders. Six people had slept under this roof last night, and one of them had used an intimate sort of weapon. Halloway crouched beside the body and noticed at once that the dead man's fingers were stained with wet green ink. The desk held no pen, no inkwell, and no trace at all of whatever he had been writing before dying. Somewhere above her, a woman began laughing, and the thin sound went on much too long to be called grief.
created_at
"2026-07-25T13:34:46.612Z"
7/25/2026, 1:34:46 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
7253
moderation_latency
(null)
generation_time
41382
tokens_prompt
46
tokens_completion
681
native_tokens_prompt
60
native_tokens_completion
3545
native_tokens_completion_images
(null)
native_tokens_reasoning
392
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
0.088925
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNs1biPNzLWcmfoYgad6"
is_byok
false
latency
3114
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-1784986486-YZiKR4tz4iWSdmBSShK9"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986486-vXQqo9By5EaocJ6mW21h"
upstream_id
"msg_011CdNs1biPNzLWcmfoYgad6"
total_cost
0.088925
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
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20