NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-05-29-01KSSJQ6F4WZ6J118J715JVRAM
Run Details
Model:
Claude Opus 4.8 (Reasoning)
Test:
Tool usage within Novelcrafter
Scenario:
Create alternate prose sections
Duration:
21.4s
Cost:
$0.033275
Provider:
Anthropic
Evaluation summary
Score
Evaluator
Details Link
Pass
Match blue prose section
(details)
Pass
Match green prose section
(details)
Pass
Match red prose section
(details)
no eval
Overall
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
I'll create three alternate continuations of the story, each exploring a different tone and direction. <nc-section data-title="Version 1: A Warrior's Welcome" data-color="red"> As I dismounted near the stables, a towering figure emerged from the shadows of the doorway. Sir Roland was every inch the warrior the songs had promised—broad-shouldered, his armor scarred from countless battles, a thick beard framing a face weathered by war and weather alike. "So, you're the new squire," he said, his voice like grinding stone. His eyes swept over me, measuring, judging. "You look soft. Too soft for what lies ahead." I straightened my back, refusing to wilt under his scrutiny. "I'm ready to learn, Sir Roland." A grim smile tugged at the corner of his mouth. "We'll see about that, boy. The road to knighthood is paved with blood and broken bones. Most who walk it never reach the end." He turned, his cloak swirling behind him. "Stable your horse and follow me. Your trials begin at dawn—and I do not tolerate weakness." </nc-section> <nc-section data-title="Version 2: An Unexpected Kindness" data-color="green"> I had barely tied Thunder to the post when a warm voice called out from across the yard. "You must be Frederick! We've been expecting you." Sir Roland approached with an easy stride, and I was surprised by how different he seemed from the fearsome knight of legend. His silver-streaked hair was tousled, and crinkles of laughter framed his kind eyes. He wiped his hands on a cloth, having clearly just come from tending his own horse. "I see you've a fine animal there," he said, running an appreciative hand along Thunder's flank. "A squire who cares for his mount well will care for his duties just as faithfully. That tells me more than any letter of introduction could." He clapped a hand on my shoulder, and I felt some of my nervousness melt away. "Come, lad. You've had a long journey, and there's warm stew waiting in the hall. We'll talk of training tomorrow. Tonight, you rest. A tired student learns nothing but exhaustion." </nc-section> <nc-section data-title="Version 3: A Mysterious Encounter" data-color="blue"> The stables were quiet save for the soft nickering of horses, and the air smelled of hay and leather. I had just begun to unsaddle Thunder when I sensed someone watching me. Turning, I found a man leaning against a wooden beam, half-hidden in the dim light. Sir Roland was not at all what I had imagined. Younger than I expected, with sharp, intelligent eyes that seemed to hold secrets behind them. He said nothing at first, simply observing. "They told me a squire was coming," he finally said, his voice low and thoughtful. "They did not tell me you would arrive on the night the old prophecies speak of." He pushed off from the beam and stepped closer, studying my face as if searching for something. "Tell me, Frederick—have you ever dreamed of dragons?" The question caught me off guard, and a chill ran down my spine. For I had dreamed of them, every night for the past month, though I had told no living soul. "How did you—" "There are forces stirring in this kingdom," he interrupted, glancing toward the darkening sky. "And I suspect you are tangled in them more deeply than either of us yet understands." </nc-section> Each version sets a different tone for Frederick's journey—the harsh trial of a stern mentor, the warmth of an unexpected ally, or the intrigue of a destiny tied to the dragons of legend. Which direction calls to you?
created_at
"2026-05-29T09:58:17.841Z"
5/29/2026, 9:58:17 AM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2091
moderation_latency
(null)
generation_time
21329
tokens_prompt
318
tokens_completion
938
native_tokens_prompt
435
native_tokens_completion
1244
native_tokens_completion_images
(null)
native_tokens_reasoning
31
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
0.033275
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_01FiwrCA9NpFpiGWZtfJC3oU"
is_byok
false
latency
1026
model_permaslug
"anthropic/claude-4.8-opus-20260528"
provider_name
"Anthropic"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer
(null)
request_id
"req-1780048697-pF9XcOMGuGzp7pNxvaQR"
session_id
(null)
api_type
"completions"
id
"gen-1780048697-hy3xAxggNEbH1w09LQTF"
upstream_id
"msg_01FiwrCA9NpFpiGWZtfJC3oU"
total_cost
0.033275
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
response_cache_source_id
(null)
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
no eval