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Run: 2026-06-01-01KT1HEMQKNSYJHJFSCYJZ69QW
Run Details
Model:
Claude Opus 4.8 (Reasoning, Low)
Test:
Tool usage within Novelcrafter
Scenario:
Create alternate prose sections
Duration:
17.2s
Cost:
$0.027350
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
I'll create three alternate continuations for you to choose from. <nc-section data-title="Version 1: A Warrior's Welcome" data-color="red"> As I dismounted near the stables, a towering figure emerged from the shadows of the archway. Sir Roland was every inch the warrior the bards sang of—broad-shouldered, his weathered face crossed with old battle scars, his eyes sharp as a hawk's. His armor bore the dents and scratches of a hundred campaigns. "So," he rumbled, crossing his arms over his breastplate, "you're the squire they've sent me." He circled me slowly, appraising me as a smith might inspect raw iron. "You look soft. We'll fix that soon enough." Despite his gruff words, there was something almost approving in the corner of his mouth. "Stable your horse, boy. Then meet me in the training yard. Your education begins now." </nc-section> <nc-section data-title="Version 2: An Unexpected Kindness" data-color="green"> A man was waiting for me by the stables, and he was not at all what I had imagined. Sir Roland had kind eyes, the color of summer wheat, and a gentle smile that softened the lines of his face. He helped me down from Thunder with practiced ease, then ran an admiring hand along the stallion's neck. "A fine animal," he said warmly. "You've cared for him well—I can tell much about a man by how he treats his horse." He clapped a firm but friendly hand upon my shoulder. "Welcome, Frederick. I know the journey from the southern villages is long and lonely. Come, you must be famished. We'll get Thunder settled, and then I'll show you to the kitchens before we speak of duties. Training can wait until morning." </nc-section> <nc-section data-title="Version 3: A Mysterious Greeting" data-color="blue"> The stables were quiet save for the soft nickering of horses, and at first I thought I was alone. Then a voice spoke from the darkness between the stalls. "You've come at last." Sir Roland stepped into the fading light, and I nearly gasped. He was younger than I expected, no more than thirty, yet his eyes held the weariness of someone who had seen far too much. He studied me with an intensity that made me shift uneasily. "The signs spoke true," he murmured, almost to himself. He reached out and gripped my forearm, his fingers cold despite the warm evening. "Tell me, Frederick—have you been having the dreams? The ones with fire and shadow and great wings blotting out the stars?" When I did not answer, his expression darkened. "No matter. You will. The dragon stirs, and you were sent here for reasons greater than any of us yet understand." </nc-section> Each version sets a different tone for Sir Roland and the story ahead—the stern mentor, the gentle guardian, or the harbinger of prophecy. Which direction would you like to pursue?
created_at
"2026-06-01T12:10:04.416Z"
6/1/2026, 12:10:04 PM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3100
moderation_latency
(null)
generation_time
17198
tokens_prompt
318
tokens_completion
750
native_tokens_prompt
435
native_tokens_completion
1007
native_tokens_completion_images
(null)
native_tokens_reasoning
32
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
0.02735
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_015tMVadXRebapzjLgcJgQn2"
is_byok
false
latency
1035
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-1780315804-CjDsm8otZnjWzSjI1JW6"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1780315804-aHXJlrBgAeNN3FH8tKzv"
upstream_id
"msg_015tMVadXRebapzjLgcJgQn2"
total_cost
0.02735
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