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Run: 2026-05-31-01KSYXHR1QVWV3271VBKHX8NWY
Run Details
Model:
Claude Opus 4.8 (Reasoning, High)
Test:
Tool usage within Novelcrafter
Scenario:
Create alternate prose sections
Duration:
12.4s
Cost:
$0.020350
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: A Knight's Welcome" data-color="red"> As I dismounted, my boots sinking into the soft earth near the stables, a broad-shouldered man strode toward me. His armor gleamed dully in the fading light, etched with the scars of a hundred battles. "You must be Frederick," he said, his voice like gravel rolling down a mountainside. "I am Sir Roland. I've been expecting you." He clasped my forearm in a grip so firm I felt my bones protest. "Come, lad. There's much to learn, and little time to learn it." </nc-section> <nc-section data-title="Chapter 2: The Stables at Dusk" data-color="green"> I led Thunder toward the stables, where the comforting scent of hay and horse mingled in the cool evening air. A figure emerged from the shadows of the doorway—a knight, though older than I had imagined, with silver threading through his dark beard. "Easy now," he murmured, not to me but to Thunder, who had grown skittish. The stallion calmed at once beneath his weathered hand. "A fine animal," he said, finally meeting my eyes with a warm, knowing smile. "I am Sir Roland. And you, I think, are the squire we've awaited." </nc-section> <nc-section data-title="Chapter 2: An Unexpected Greeting" data-color="blue"> Before I could even tie Thunder's reins to the post, a voice rang out behind me, bright with amusement. "By the gods, they sent me a child!" I turned to find a knight leaning against the stable wall, arms crossed, a crooked grin splitting his face. He pushed himself upright and ambled over, looking me up and down with mock seriousness. "Sir Roland, at your service—though after seeing those skinny arms, I wonder if it shouldn't be the other way around." He laughed and ruffled my hair as though I were a kid brother. "Don't fret, lad. We'll make a knight of you yet." </nc-section>
created_at
"2026-05-31T11:43:45.731Z"
5/31/2026, 11:43:45 AM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2636
moderation_latency
(null)
generation_time
12384
tokens_prompt
318
tokens_completion
510
native_tokens_prompt
435
native_tokens_completion
727
native_tokens_completion_images
(null)
native_tokens_reasoning
44
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
0.02035
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_01HsRnmsA6MxdFpxCuQY2V3G"
is_byok
false
latency
1089
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-1780227825-0FUoumUiZNk06pUlMd96"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1780227825-92nZCTKNK5B8dn0sd8iv"
upstream_id
"msg_01HsRnmsA6MxdFpxCuQY2V3G"
total_cost
0.02035
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