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Run: 2026-06-01-01KT1J9D3PQDYYR42Z6AS2CE16
Run Details
Model:
Claude Opus 4.8 (Reasoning, Low)
Test:
Tool usage within Novelcrafter
Scenario:
Create alternate prose sections
Duration:
15.5s
Cost:
$0.025875
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="Version 1: A Stern Welcome" data-color="red"> As I dismounted near the stables, a tall figure stepped from the shadows of the doorway. Sir Roland was every bit the legendary knight I had heard tales of—broad-shouldered, with a scar running down his weathered cheek and eyes that seemed to measure my worth in a single glance. "So, you're the new squire," he said, his voice gruff as gravel. He circled Thunder, inspecting the beast with a practiced eye. "A fine horse. Let us hope its rider proves equally worthy. Training begins at dawn, boy, and I have little patience for the lazy or the weak." I swallowed hard and stood as straight as I could manage. "I won't disappoint you, Sir Roland." "We shall see," he replied, turning on his heel. "We shall see." </nc-section> <nc-section data-title="Version 2: An Unexpected Kindness" data-color="green"> I had barely swung down from the saddle when a warm voice called out across the courtyard. "You must be Frederick! We've been expecting you." Sir Roland emerged from the stables, wiping his hands on a cloth, a genuine smile spreading across his bearded face. He was younger than I had imagined, with kind eyes that crinkled at the corners. "Sir Roland?" I asked, hardly believing that this friendly man was the famous knight. "The very same. Come, let me help you with Thunder here." He stroked the stallion's nose, and the horse nickered softly in approval. "A good horse knows a good heart. I think you and I shall get along just fine, young squire. Now, let's get you settled before supper. You must be famished after such a long ride." </nc-section> <nc-section data-title="Version 3: A Mysterious Encounter" data-color="blue"> A cold wind suddenly stirred the air as I led Thunder toward the stables. From within the dim interior, a figure detached itself from the darkness—Sir Roland, though he was not as I had pictured him. He wore his armor even now, at dusk, as though he never removed it. His gaze was distant, troubled, fixed on some horizon only he could see. "You arrive at a strange hour, Frederick," he said quietly, not bothering with formalities. "There are things stirring in this kingdom that no squire should have to face. And yet, here you are." He finally looked at me, and I saw something flicker in his eyes—fear, perhaps, or warning. "Tell me, boy. Did you see anything unusual on the road? Anything... watching you?" I felt a chill crawl up my spine. "No, sir. Only the open fields." "Good," he murmured. "Let us hope it stays that way." </nc-section>
created_at
"2026-06-01T12:24:41.339Z"
6/1/2026, 12:24:41 PM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2195
moderation_latency
(null)
generation_time
15478
tokens_prompt
318
tokens_completion
707
native_tokens_prompt
435
native_tokens_completion
948
native_tokens_completion_images
(null)
native_tokens_reasoning
40
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
0.025875
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_01FxvJbgFrVp59ddLpzCLRRo"
is_byok
false
latency
958
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-1780316681-blZP8yeiix7MPg2xdmfc"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1780316681-8Mwn6cg9trRIcfbcKQ88"
upstream_id
"msg_01FxvJbgFrVp59ddLpzCLRRo"
total_cost
0.025875
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