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Run: 2026-05-29-01KSSJJXFX8C6A6H6AGNH0HV87
Run Details
Model:
Claude Opus 4.8 (Reasoning)
Test:
Tool usage within Novelcrafter
Scenario:
Create alternate prose sections
Duration:
16.7s
Cost:
$0.025250
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
<nc-section data-title="A Knight's Welcome" data-color="red"> As I dismounted near the stables, a towering figure emerged from the shadows. Sir Roland, clad in worn but well-kept armor, strode toward me with the confidence of a seasoned warrior. His weathered face bore the scars of countless battles, yet his eyes held a surprising warmth. "You must be Frederick," he said, his voice deep and commanding. He clasped my forearm in a firm grip. "I've heard much about you, young squire. Your father was a good man—one of the finest soldiers I ever fought beside." I felt a swell of pride at the mention of my late father. "It's an honor to meet you, Sir Roland." "The honor is mine, lad. Now, let's get Thunder settled. A knight's first lesson: always tend to your horse before yourself." </nc-section> <nc-section data-title="The Stable Encounter" data-color="green"> Before I could lead Thunder to the stables, a gruff voice called out from the doorway. "About time you arrived, boy. We expected you by midday." Sir Roland stepped into the fading light, his arms crossed over a broad chest. Unlike the gallant knights of the stories my mother told, this man looked tired, impatient, and entirely unimpressed by my late arrival. "I apologize, Sir Roland," I stammered. "The road from the eastern villages was longer than I anticipated." He grunted, looking me over from head to toe as though assessing a piece of livestock. "We'll see if you're worth the trouble. Stable your horse and meet me in the training yard at dawn. Don't be late again." With that, he turned on his heel and disappeared into the gathering darkness. </nc-section> <nc-section data-title="An Unexpected Meeting" data-color="blue"> I had barely brought Thunder to a halt when a man appeared from behind a stack of hay bales, brushing straw from his tunic. He wasn't what I expected of a knight—no shining armor, no sword at his hip, just simple riding clothes and mud-splattered boots. "You'll be the new squire, then," he said with an easy smile, reaching up to stroke Thunder's neck. The stallion, normally wary of strangers, leaned into his touch. "Fine animal. You've cared for him well." "Thank you, sir. Are you—are you one of the stablehands?" The man laughed, a rich and genuine sound. "Stablehand? I suppose I am, when the mood takes me. But most around here call me Sir Roland." He extended a calloused hand. "Welcome to the castle, Frederick. I have a feeling we're going to get along just fine." </nc-section>
created_at
"2026-05-29T09:55:57.575Z"
5/29/2026, 9:55:57 AM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2321
moderation_latency
(null)
generation_time
16627
tokens_prompt
318
tokens_completion
685
native_tokens_prompt
435
native_tokens_completion
923
native_tokens_completion_images
(null)
native_tokens_reasoning
35
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
0.02525
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_01SXYWc1S36GHh2BB5WcckZM"
is_byok
false
latency
1141
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-1780048557-zLVP3C7dwAfQcSvS2Hl0"
session_id
(null)
api_type
"completions"
id
"gen-1780048557-AaXhnshQDp4BoLiT9wiA"
upstream_id
"msg_01SXYWc1S36GHh2BB5WcckZM"
total_cost
0.02525
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