NC Bench
Overview
About
Tests
Models
Model
Claude Opus 4.5
Test
Tool usage within Novelcrafter
Scenario
Create alternate prose sections
Run ID
2026-02-08-01KGYZP0XSNDWD7H2GTW8P80A8
Model input
System
You are an expert fantasy novel author. You are working on a novel called "The Chronicles of the Last Dragon". The following tools are available to you: - <nc-section> Use this tool to create a new section of prose. Arguments: - "data-title": The title of the section. - "data-color": Any color of (red, green, blue, yellow, purple, orange, pink, brown). Example usage: <nc-section data-title="Chapter 1: The Arrival" data-color="blue"> Frederick, a young squire, arrives at the castle to begin his training. </nc-section>
User/Human
The story so far: <storySoFar> Frederick, a young squire, arrives at the castle to begin his training. </storySoFar>
AI
My horse, a majestic stallion named Thunder, galloped across the open field. The wind whipped through my hair as I rode towards the castle gates. The sun was setting, casting a warm glow over the stone walls. I could see the banners of the kingdom fluttering in the breeze.
User/Human
Continue the story with the following instructions: """The local knight, Sir Roland, greets Frederick near the stables.""" Create 3 alternate prose sections that continue the story. - Version 1 (red) - Version 2 (green) - Version 3 (blue)
Model response
Messages
Meta
AI
<nc-section data-title="Version 1" data-color="red"> As I dismounted near the stables, a broad-shouldered man in polished armor approached me. His weathered face bore the scars of countless battles, yet his eyes held a warmth that put me at ease. "You must be Frederick," he said, his voice deep and commanding. "I am Sir Roland, Master of Arms here at Thornwall Castle. Your father wrote to me of your arrival." He clasped my shoulder with a gauntleted hand, nearly buckling my knees. "Welcome, lad. By the time I'm finished with you, you'll either be a knight worthy of the realm—or you'll wish you'd stayed home tending sheep." </nc-section> <nc-section data-title="Version 2" data-color="green"> A stable boy rushed forward to take Thunder's reins as I swung down from the saddle. My legs ached from the three-day journey, and I stretched them gratefully on solid ground. "Not bad form for a newcomer," called a voice from the shadows of the stable. A knight emerged, his silver hair catching the last rays of sunlight. He walked with a slight limp but carried himself with unmistakable authority. "Sir Roland?" I asked, offering a hasty bow. "The very same." He circled me slowly, appraising me as one might examine a horse at market. "Hmm. Thin as a willow branch, but there's something in your eyes. Determination, perhaps. We shall see if it survives your first week of training." </nc-section> <nc-section data-title="Version 3" data-color="blue"> The clang of metal on metal rang out from somewhere beyond the stables, and I followed the sound to find a knight drilling two young men with wooden swords. He moved with lethal grace despite his age, disarming both opponents in a single fluid motion. "Pathetic," he declared, though not unkindly. Then his gaze fell upon me. "Ah, fresh blood arrives." He tossed one of the practice swords in my direction. I caught it clumsily, nearly dropping it. "I am Sir Roland," he announced, raising his own wooden blade. "And your first lesson begins now. Defend yourself!" Before I could protest that I'd just ridden for three days without rest, he was upon me. </nc-section>
created_at
"2026-02-08T16:00:00.239189+00:00"
Sunday, February 8th, 2026 at 4:00:00 PM GMT+00:00
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1480
moderation_latency
(null)
generation_time
13057
tokens_prompt
282
tokens_completion
491
native_tokens_prompt
335
native_tokens_completion
563
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)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.01575
router
(null)
provider_responses
0
id
"msg_017JuUvSrShcZXbAG6XYxPyZ"
status
200
is_byok
false
latency
1372
endpoint_id
"be883404-eb42-4b2d-b6e4-c7daa3aa8d62"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1770566386-zboIvmeGdDTqpvNdFOTU"
upstream_id
"msg_017JuUvSrShcZXbAG6XYxPyZ"
total_cost
0.01575
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
Pass
Match blue prose section
/<nc-section data-title="[^"]*" data-color="blue">[^<]+<\/nc-section>/
n/a
Pass
Match green prose section
/<nc-section data-title="[^"]*" data-color="green">[^<]+<\/nc-section>/
n/a
Pass
Match red prose section
/<nc-section data-title="[^"]*" data-color="red">[^<]+<\/nc-section>/
n/a
100.0000%