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Run: 2026-05-29-01KSSJG002TJK0BEEX6TX501EG
Run Details
Model:
Claude Opus 4.8 (Reasoning)
Test:
Tool usage within Novelcrafter
Scenario:
Create alternate prose sections
Duration:
18.1s
Cost:
$0.024250
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 Welcome" data-color="red"> As I dismounted near the stables, a broad-shouldered man strode toward me, his armor catching the dying light. Sir Roland, the kingdom's most renowned knight, extended a calloused hand. "You must be Frederick," he said, his voice deep and weathered. "We've been expecting you. Word of your father's valor reached us long before you did." I clasped his hand, feeling the strength of a hundred battles in his grip. "It's an honor, Sir Roland." "The honor is yet to be earned, lad," he replied with a knowing smile. "But every great knight begins exactly where you stand now—covered in road dust and full of dreams." </nc-section> <nc-section data-title="Chapter 2: The Stable Encounter" data-color="green"> The stables smelled of hay and leather as I led Thunder inside. A shadow fell across the doorway, and I turned to find a tall figure leaning against the wooden frame, arms crossed. "A fine animal," the man observed, nodding toward Thunder. "Though a fine horse does not make a fine rider." He pushed off the frame and approached. "I am Sir Roland. And you, I presume, are the squire I've been tasked with shaping into something useful." There was a gruffness to him, but his eyes held a glint of amusement. I bowed my head respectfully. "Frederick, my lord. I'm ready to learn." "We shall see about that," he said, circling me like a hawk assessing prey. "Readiness is easily claimed. Proven? That is another matter entirely." </nc-section> <nc-section data-title="Chapter 2: A Knight's Greeting" data-color="blue"> I had barely begun to unsaddle Thunder when a warm laugh echoed through the stables. An older knight approached, silver threading through his beard, his eyes crinkling with genuine welcome. "Ah, the new blood arrives at last!" he exclaimed, clapping me firmly on the shoulder. "I am Sir Roland. Forgive the lack of ceremony—I find a stable a far better place to take the measure of a man than any throne room." His easy manner put me instantly at ease. "Frederick, sir. I've traveled three days to reach you." "Three days of saddle sores, no doubt," he chuckled. "Come, leave your steed to the grooms. There's stew by the fire and a warm bed waiting. Your training begins at dawn, and trust me, lad—you'll want your strength." </nc-section>
created_at
"2026-05-29T09:54:21.837Z"
5/29/2026, 9:54:21 AM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5345
moderation_latency
(null)
generation_time
18102
tokens_prompt
318
tokens_completion
643
native_tokens_prompt
435
native_tokens_completion
883
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
0.02425
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_01QEk81cVkMZeigjo8sdz9F3"
is_byok
false
latency
4098
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-1780048461-W4AU6KleKd3kETdorGzF"
session_id
(null)
api_type
"completions"
id
"gen-1780048461-RvxQK0nUCooSGJ6GEtUU"
upstream_id
"msg_01QEk81cVkMZeigjo8sdz9F3"
total_cost
0.02425
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