Run: 2026-05-31-01KSYXBP9CP4A1TF0QA4WVPH9Y

Run Details

Duration:
13.3s
Cost:
$0.021725
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
I'll create three alternate continuations for this moment in Frederick's journey. <nc-section data-title="Version 1: A Warm Welcome" data-color="red"> As I dismounted near the stables, a broad-shouldered man in polished armor strode toward me, his weathered face breaking into a warm smile. "You must be Frederick," he said, clasping my forearm in a firm grip. "I am Sir Roland. We've been expecting you." His eyes, kind yet sharp, studied me with the practiced gaze of a seasoned warrior. "Come, lad. Let us get Thunder settled, and then I'll show you where you'll be sleeping. Tomorrow, your training begins at dawn—and I warn you, I am not known for my patience with idle squires." </nc-section> <nc-section data-title="Version 2: A Stern First Impression" data-color="green"> A figure emerged from the shadows of the stables, and I nearly stumbled in my haste to appear composed. Sir Roland was taller than I had imagined, his armor bearing the scars of a hundred battles. He said nothing at first, merely circling Thunder with a critical eye before turning that same scrutiny upon me. "So this is what they send me," he muttered, more to himself than to me. "A boy who rides hard and thinks little." He sighed. "Well, Frederick, we shall see what you're made of. Tend to your horse first. A knight who neglects his mount neglects his life." </nc-section> <nc-section data-title="Version 3: An Unexpected Encounter" data-color="blue"> I had barely swung down from the saddle when a voice called out from the stable doorway. "Easy there—you'll spook the mares." A man stepped into the fading light, leading a chestnut mare by the reins. There was something unhurried about him, a calm that spoke of quiet confidence rather than arrogance. "Sir Roland," he offered, by way of introduction, though he did not extend his hand. Instead, he reached past me to stroke Thunder's neck. "Fine animal. You've cared for him well on the road—that tells me more about you than any letter of recommendation could. Welcome to the castle, Frederick. You'll find we judge men here by their deeds, not their birth." </nc-section>
created_at"2026-05-31T11:40:27.321Z" 5/31/2026, 11:40:27 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2106
moderation_latency(null)
generation_time13255
tokens_prompt318
tokens_completion563
native_tokens_prompt435
native_tokens_completion782
native_tokens_completion_images(null)
native_tokens_reasoning22
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"
usage0.021725
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_014Uk61Wad7b5M1PWvzro4F3"
is_byokfalse
latency1020
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-1780227627-e5f3S9cGuEx6Ng3qpoCG"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227627-WcvUs3h5kHIAHFjub6ZC"
upstream_id"msg_014Uk61Wad7b5M1PWvzro4F3"
total_cost0.021725
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