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Run: 2026-06-01-01KT1GKRAHPFJAY8JK16W6JSKA
Run Details
Model:
Claude Opus 4.8 (Reasoning, Low)
Test:
Tool usage within Novelcrafter
Scenario:
Create alternate prose sections
Duration:
14.4s
Cost:
$0.024075
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="Chapter 2: The Knight's Welcome" data-color="red"> As Thunder slowed to a trot near the stables, a broad-shouldered figure emerged from the shadows of the doorway. Sir Roland stood tall, his weathered face creased by years of battle and sun. A scar traced a pale line across his cheek, but his eyes were kind. "You must be Frederick," he said, his voice deep and resonant. He extended a calloused hand. "I am Sir Roland. We've been expecting you. Come, let us see to your horse—a fine animal, that one. Then we shall talk of the trials that await you." I dismounted, my legs trembling from the long ride, and clasped his hand firmly. His grip nearly crushed mine, but I refused to wince. </nc-section> <nc-section data-title="Chapter 2: An Unexpected Greeting" data-color="green"> Before I could even dismount, a booming laugh echoed across the courtyard. A knight in gleaming half-armor strode toward me, his helmet tucked under one arm and a grin spread wide across his bearded face. "By the gods, look at this one!" Sir Roland bellowed, clapping a hand on Thunder's flank. "They send me boys who ride like they were born in the saddle, yet still wet behind the ears." He laughed again, then fixed me with a sudden, piercing stare. "Tell me, squire—do you know why you've truly been summoned here? Or did they keep you in the dark like all the rest?" I swallowed hard, uncertain whether he was testing me or warning me. </nc-section> <nc-section data-title="Chapter 2: The Silent Sentinel" data-color="blue"> The stables were quiet save for the soft nickering of horses. As I led Thunder inside, I noticed a man leaning against a wooden post, arms folded across his chest. He wore no armor—only a simple tunic stained with mud and oil—yet there was an unmistakable authority in his stance. "Frederick," he said. It was not a question. Sir Roland pushed himself off the post and walked a slow circle around me, studying me as a merchant might appraise a horse. "You arrived later than expected. The roads, I assume?" Before I could answer, he nodded to himself. "No matter. You're here now. But understand this, boy—the castle is not what it appears to be. Keep your eyes open and your mouth shut, and you may yet survive your training." A chill ran down my spine that had nothing to do with the evening air. </nc-section>
created_at
"2026-06-01T11:55:23.35Z"
6/1/2026, 11:55:23 AM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2240
moderation_latency
(null)
generation_time
14394
tokens_prompt
318
tokens_completion
644
native_tokens_prompt
435
native_tokens_completion
876
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
0.024075
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_01S63N9j2DNwSbqk6cGMvpQW"
is_byok
false
latency
1147
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-1780314923-FYEEyUDGDMZhLMEATA9G"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1780314923-IJuw9xiLyyBf04dBFywy"
upstream_id
"msg_01S63N9j2DNwSbqk6cGMvpQW"
total_cost
0.024075
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