Run: 2026-06-01-01KT1J70QC08RGM4K87F8RKMJR

Run Details

Duration:
15.6s
Cost:
$0.024400
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 filling my nostrils, a towering figure emerged from the shadows. Sir Roland was every bit the legend the village storytellers had described—broad-shouldered, with a scar tracing his weathered cheek and eyes sharp as forged steel. "So, you're the new squire," he said, his voice gruff but not unkind. He clasped my forearm in a grip that nearly buckled my knees. "Frederick, is it? We'll see if you've got the spine for this life. Many arrive with dreams, boy. Few leave with honor." I swallowed hard, trying to match his unwavering gaze. "I'm ready to learn, Sir Roland." A faint smirk crossed his lips. "We shall see." </nc-section> <nc-section data-title="Chapter 2: An Unexpected Greeting" data-color="green"> I had barely tied Thunder's reins to the post when a warm, booming laugh echoed across the courtyard. Sir Roland approached with an easy stride, a man whose armor gleamed but whose smile gleamed brighter still. "Frederick! By the gods, you've your father's look about you," he said, throwing an arm around my shoulders as though we were old friends. "I served alongside him in the northern campaigns, you know. A finer man never lifted a blade." I blinked, caught off guard. "You knew my father, sir?" "Knew him? I owe him my life thrice over." His eyes softened with memory. "Come, lad. There is much to teach you, and even more to tell. Your training begins not with the sword, but with a meal and a story." </nc-section> <nc-section data-title="Chapter 2: The Measure of a Man" data-color="blue"> The stables were quiet save for the soft nickering of horses, and at first I thought myself alone. Then I noticed him—a man kneeling beside a wounded mare, gently dressing a gash along her flank. He did not look up as I entered. "You ride hard for a boy who has never seen battle," Sir Roland said softly, his attention fixed on the horse. "Thunder, is he called? A good name. A proud name. Pride will serve you well, or it will be your undoing." He finally rose, wiping his hands on a cloth, and studied me with quiet intensity. "Tell me, Frederick—why have you truly come? And do not give me the answer you rehearsed on the road." I opened my mouth, then closed it again, for I realized I did not have an answer at all. </nc-section>
created_at"2026-06-01T12:23:23.121Z" 6/1/2026, 12:23:23 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2276
moderation_latency(null)
generation_time15563
tokens_prompt318
tokens_completion665
native_tokens_prompt435
native_tokens_completion889
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"
usage0.0244
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01L4eA2F6e9YkvHVBuQeJVS3"
is_byokfalse
latency1031
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-1780316603-NqODtLmkkKvkNabd8On3"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780316603-0Zzal6lUsaDXPOCZ98FL"
upstream_id"msg_01L4eA2F6e9YkvHVBuQeJVS3"
total_cost0.0244
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