NC Bench
Overview
About
Tests
Models
Model
Claude Opus 4.5
Test
Tool usage within Novelcrafter
Scenario
Create alternate prose sections
Run ID
2026-02-08-01KGYX4H31804SME8K470D95GH
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 broad-shouldered figure emerged from the shadows of the gatehouse. Sir Roland was everything the stories had promised—a weathered face marked by countless battles, a silver-streaked beard, and eyes that seemed to measure a man's worth in a single glance. "You must be Frederick," he said, his voice like gravel. He didn't offer his hand, but instead took Thunder's reins from me with practiced ease. "Your father wrote that you were eager. Eagerness can get a squire killed." He paused, studying me. "It can also make him great. We shall see which fate awaits you." </nc-section> <nc-section data-title="Version 2" data-color="green"> The stable hands rushed forward to take Thunder's reins, but a commanding voice cut through the evening air. "Leave him! A squire tends to his own mount." I turned to find Sir Roland striding toward me, his armor catching the last rays of sunlight. He was younger than I had expected, perhaps thirty winters, with a sharp jawline and a scar that traced from his left ear to the corner of his mouth. "Welcome to Ashford Keep, boy," he said, clapping a heavy gauntlet on my shoulder. A smile played at his lips. "I hope you've said your farewells to soft beds and hot meals. Your new life begins now." </nc-section> <nc-section data-title="Version 3" data-color="blue"> I had barely led Thunder into the stable yard when I heard the rhythmic clang of a blacksmith's hammer fall silent. A knight in simple riding leathers approached, wiping his hands on a cloth. There was nothing imposing about him at first glance—average height, an unassuming face, hair the color of straw. "Frederick of Millbrook?" he asked quietly. "Yes, my lord. I seek Sir Roland—" "You've found him." His grey eyes held mine, and in that moment I understood why my father had sent me here. There was something ancient in that gaze, something that had seen darkness and survived it. "Come. We have much to discuss, and very little time. The dragon stirs again." </nc-section>
created_at
"2026-02-08T15:15:29.627415+00:00"
Sunday, February 8th, 2026 at 3:15:29 PM GMT+00:00
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1858
moderation_latency
(null)
generation_time
12698
tokens_prompt
282
tokens_completion
485
native_tokens_prompt
335
native_tokens_completion
533
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
0.015
router
(null)
provider_responses
0
id
"msg_01WuV23u1r1SDe4zFf6pMcUr"
status
200
is_byok
false
latency
1858
endpoint_id
"be883404-eb42-4b2d-b6e4-c7daa3aa8d62"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1770563716-GtJnPONDJBfKRR21YNko"
upstream_id
"msg_01WuV23u1r1SDe4zFf6pMcUr"
total_cost
0.015
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%