NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-10-09-01M4FZW4GJBPW3DT12EM5N6GQT
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
2.7s
Cost:
$0.000131
Provider:
Claude Platform on AWS
Evaluation summary
Score
Evaluator
Details Link
81.22%
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 had not stopped for three days straight now. Detective Mara Voss stood beneath the flickering streetlamp outside. Yellow tape fluttered across the mansion gate like nervous ribbons. Inside, someone had died in the library, quietly and alone. Her partner, Tomas Reyes, lit a cigarette with trembling fingers. "The housekeeper found him just after dawn," he said. Mara pulled on gloves and stepped carefully across the wet gravel. Every window of the house glowed except one upstairs. That dark window, she suspected, held the answer. She climbed the marble steps without waiting for the uniformed officers. The front door stood slightly open, as if inviting her in. Somewhere deep in the house, a clock began to chime.
created_at
"2026-10-09T09:28:26.904Z"
10/9/2026, 9:28:26 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
782
moderation_latency
(null)
generation_time
2632
tokens_prompt
46
tokens_completion
182
native_tokens_prompt
62
native_tokens_completion
250
native_tokens_completion_images
(null)
native_tokens_reasoning
0
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
0.0001312
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791538106-p56xqBEOmLhIUaEjOlQ1"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791538106-HgOEDCy4HmGho83GrPnR"
upstream_id
"msg_011CfrRhdm3y3cvdrngnnxQW"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfrRhdm3y3cvdrngnnxQW"
is_byok
false
latency
782
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0001312
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
81.22%
Matches word count
n/a
neededClean
false
sentences
12
wordCounts
0
10
1
9
2
10
3
10
4
10
5
9
6
11
7
9
8
8
9
11
10
11
11
10