Run: 2026-05-31-01KSYXFTC5YDDPRBNGZHC3F7HE

Run Details

Duration:
12.4s
Cost:
$0.021750
Provider:
Anthropic

Evaluation summary

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

AI
<nc-section data-title="Chapter 2: A Knight's Welcome" data-color="red"> As I dismounted near the stables, the smell of hay and leather filled my nostrils. A broad-shouldered man in polished armor strode toward me, his boots crunching on the gravel. "You must be Frederick," he said, his voice deep and commanding. "I am Sir Roland. I've heard much about you from the master-at-arms." He extended a calloused hand, and when I shook it, his grip nearly crushed my fingers. There was a sharpness in his gray eyes that told me he would tolerate no weakness. "We begin your training at dawn. Rest well tonight, boy—it may be the last good rest you get for a while." </nc-section> <nc-section data-title="Chapter 2: An Unexpected Friend" data-color="green"> I had barely tied Thunder to the post when a cheerful voice called out from the shadows of the stable. "A fine beast you have there!" An older man emerged, wiping his hands on a cloth, a warm smile crinkling the corners of his weathered face. He wore the insignia of a knight, though his manner was anything but formal. "Sir Roland, at your service. And you'd be young Frederick, yes?" He clapped me on the shoulder like an old friend. "Come, let me show you around. The castle can be a confusing place for newcomers, but you'll find we're not so frightening once you get to know us." His laughter was easy, and for the first time since leaving home, I felt my nerves begin to settle. </nc-section> <nc-section data-title="Chapter 2: The Stern Sentinel" data-color="blue"> The clang of a blade against a whetstone drew my attention as I led Thunder into the stable yard. There, seated upon an overturned barrel, was a man honing his sword with deliberate care. He did not look up at first. "You're late," he said simply, testing the edge of his blade against his thumb. Only then did he raise his eyes to meet mine. "Sir Roland," he offered, rising to his full height. He studied me for a long moment, taking in my travel-worn clothes and uncertain posture. "A squire is judged not by how he arrives, but by what he becomes. Stable your horse, then find me in the training yard. We shall see what you are made of." </nc-section>
created_at"2026-05-31T11:42:42.577Z" 5/31/2026, 11:42:42 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2005
moderation_latency(null)
generation_time12353
tokens_prompt318
tokens_completion597
native_tokens_prompt435
native_tokens_completion783
native_tokens_completion_images(null)
native_tokens_reasoning43
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"end_turn"
service_tier"default"
usage0.02175
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01BWG4TfVztJ8kj3paWM9iRf"
is_byokfalse
latency1015
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer(null)
request_id"req-1780227762-AMitow6dy3OZ7i6bBuIp"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227762-SCReBYDRvL9hXjpImNWQ"
upstream_id"msg_01BWG4TfVztJ8kj3paWM9iRf"
total_cost0.02175
cache_discount(null)
upstream_inference_cost0
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