NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-10-08-01M4DAHKNZFJJ28KDJTPMDG47R
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.4s
Cost:
$0.001091
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The rain hammered against the windows of Blackwood Manor as the clock struck midnight, and nobody noticed the terrified scream. Inspector Eleanor Hart stood in the foyer, her wet coat dripping onto the marble floor while nervous constables shouted orders. Lord Edmund Blackwood lay sprawled across the Persian rug in the library, a silver letter opener protruding from his chest. Hart knelt beside the body, noting the untouched brandy, the overturned chair, and muddy footprints leading toward the servants' staircase. Someone had wiped the library clean, yet one small, deliberately overlooked detail refused to stay hidden beneath the mahogany desk. Hart pulled out a crumpled lace handkerchief, its faint scent of lavender suggesting the killer had not been a man. Across the hallway, the widow Margaret Blackwood watched from the stairs, her eyes fixed on the detective with unmistakable fear. Hart folded the handkerchief into an evidence bag, certain that Margaret knew exactly who had walked through that door tonight.
created_at
"2026-10-08T08:37:13.03Z"
10/8/2026, 8:37:13 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
7607
moderation_latency
(null)
generation_time
8410
tokens_prompt
46
tokens_completion
257
native_tokens_prompt
62
native_tokens_completion
2170
native_tokens_completion_images
(null)
native_tokens_reasoning
1810
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
0.0010912
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448633-fYVqkyUbVXbSyOze6sFc"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448633-IftlSHbpoDb7IEEelXZR"
upstream_id
"msg_011CfpTz8VNCny3vYWb7wZ3v"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpTz8VNCny3vYWb7wZ3v"
is_byok
false
latency
724
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0010912
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20