NC Bench
Overview
About
Tests
Models
Model
Claude Opus 4.5
Test
Tool usage within Novelcrafter
Scenario
Create alternate prose sections
Run ID
2026-02-08-01KGZ094W7YPG0F982ZBGFCWFT
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 Thunder near the stables, a towering figure emerged from the shadows. Sir Roland stood before me, his weathered face creased with a stern expression that softened only slightly as he assessed me from head to toe. "So you're the one Lord Ashworth sent," he said, his voice like gravel. "Frederick, is it?" I bowed quickly, nearly stumbling over my own feet. "Yes, Sir Roland. I am honored to—" "Save the pleasantries, boy." He clasped my shoulder with a grip that could crush iron. "Here, you'll earn honor, not speak of it. Stable your horse and report to the armory. Your training begins at dawn." </nc-section> <nc-section data-title="Version 2" data-color="green"> The stable master took Thunder's reins as I slid from the saddle, my legs aching from the long journey. I was brushing the dust from my cloak when a hearty laugh rang out across the courtyard. "By the old gods, they're sending them younger every year!" I turned to find Sir Roland striding toward me, his silver-streaked beard doing nothing to diminish the vitality in his step. Unlike the grim warrior I had imagined, his eyes sparkled with warmth. "Welcome, young Frederick!" He clasped my hand firmly. "Your father and I fought together at the Siege of Thornwall. He saved my life twice—though he'd say it was three times if he'd had more ale in him." He grinned. "I intend to repay that debt by making you the finest knight this realm has ever seen." </nc-section> <nc-section data-title="Version 3" data-color="blue"> I had barely led Thunder into the stable when I noticed I was not alone. A knight sat quietly on a hay bale in the corner, polishing a blade that gleamed even in the dim light. He did not look up as he spoke. "You ride well. But you grip the reins too tightly. A horse senses fear." I swallowed hard. "Sir Roland?" He finally raised his gaze to meet mine, and I saw something ancient and knowing in those pale grey eyes—the look of a man who had seen too many battles, buried too many friends. "The last three squires assigned to me are dead, Frederick." He sheathed his sword and stood. "I don't say this to frighten you. I say it because if you're to survive what's coming, you need to understand—this castle doesn't train knights. It forges dragon slayers." </nc-section>
created_at
"2026-02-08T16:10:29.246984+00:00"
Sunday, February 8th, 2026 at 4:10:29 PM GMT+00:00
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1573
moderation_latency
(null)
generation_time
15206
tokens_prompt
282
tokens_completion
549
native_tokens_prompt
335
native_tokens_completion
618
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
0.017125
router
(null)
provider_responses
0
id
"msg_01N437BLgAKv53ApxicgTrkH"
status
200
is_byok
false
latency
1485
endpoint_id
"be883404-eb42-4b2d-b6e4-c7daa3aa8d62"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1770567013-0vr2C3YGA2HT1bcMWGpV"
upstream_id
"msg_01N437BLgAKv53ApxicgTrkH"
total_cost
0.017125
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%