NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-10-08-01M4DA7Z6M8818R134WRAY69JC
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
7.3s
Cost:
$0.000939
Provider:
Claude Platform on AWS
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 rain fell hard on Ashford Manor that November night. Inspector Thomas Greaves stood alone beneath the dripping oak trees. Somewhere deep inside, a clock struck midnight with terrible finality. Lady Eleanor Ashford had been found dead in her study. Greaves pushed open the heavy oak door and stepped inside. The room smelled of brandy, candle wax, and something sharper. Her body slumped over the mahogany desk, one hand outstretched. A silver letter opener lay gleaming beside her open palm. Nothing in the room appeared disturbed, except for one detail. The window behind her hung open, admitting the freezing storm. Yet the rug beneath the window was perfectly, impossibly dry. Greaves knelt down, sensing this case would never be simple.
created_at
"2026-10-08T08:31:57.177Z"
10/8/2026, 8:31:57 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
7252
moderation_latency
(null)
generation_time
7253
tokens_prompt
46
tokens_completion
186
native_tokens_prompt
62
native_tokens_completion
1866
native_tokens_completion_images
(null)
native_tokens_reasoning
1601
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
0.0009392
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448317-tS1dAYzjDsowhtdRCJKd"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448317-TQVaQkybGbuUKOIrQovS"
upstream_id
"msg_011CfpTarTa9xEHeTVz5BGKB"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpTarTa9xEHeTVz5BGKB"
is_byok
false
latency
771
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0009392
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Claude Platform on AWS"
response_cache_source_id
(null)
data_region
"global"
workspace_id
"97e315e5-d303-487d-83c1-83180e8a13d4"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
12
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