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Run: 2026-06-01-01KT1G89Y15QT915YNNJB8FWPB
Run Details
Model:
Claude Opus 4.8 (Reasoning, Low)
Test:
Tool usage within Novelcrafter
Scenario:
Create alternate prose sections
Duration:
13.9s
Cost:
$0.023650
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 I dismounted near the stables, a towering figure emerged from the shadows. Sir Roland, the castle's most renowned knight, strode toward me with measured steps. His armor gleamed despite the fading light, and a weathered scar traced a line down his cheek. "So, you're the new squire," he said, his voice deep and commanding. He looked Thunder over with an appraising eye. "A fine beast. Let us see if the rider matches the mount." I straightened my back, determined to prove myself worthy. "Frederick, sir. At your service." Sir Roland's stern expression softened, just slightly. "We shall make a knight of you yet, boy. Come, the training begins at dawn." </nc-section> <nc-section data-title="Chapter 2: An Unexpected Greeting" data-color="green"> I had barely tied Thunder to the post when a hearty laugh boomed across the stable yard. A burly man with a russet beard and twinkling eyes approached, wiping his hands on a cloth. "Ah, you must be Frederick!" Sir Roland clapped a heavy hand on my shoulder, nearly buckling my knees. "We've been expecting you for days. The roads have been treacherous, no?" "Quite, Sir Roland," I managed, surprised by the warmth of his welcome. I had expected a cold reception, not this jovial knight. "Nonsense with the formalities tonight," he chuckled, leading me toward the keep. "First, we feast. Tomorrow, we sweat. A squire fights better on a full stomach, I always say." </nc-section> <nc-section data-title="Chapter 2: A Shadow at the Stables" data-color="blue"> A cold mist had begun to settle as I led Thunder into the stables. The air felt heavy, expectant. Then I sensed him before I saw him—a presence in the darkness near the far stall. "You ride well," came a quiet voice. Sir Roland stepped into the lantern light, his face unreadable, his hand resting on the pommel of his sword. "But riding is the least of what you will need here." I swallowed hard. There was something in his eyes—a warning, perhaps, or a secret he was not yet ready to share. "These are dangerous times, Frederick," he continued, his gaze drifting toward the mountains beyond the walls. "Dragons stir in the north. And you arrive at a strange hour indeed." </nc-section>
created_at
"2026-06-01T11:49:08.171Z"
6/1/2026, 11:49:08 AM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2157
moderation_latency
(null)
generation_time
13824
tokens_prompt
318
tokens_completion
636
native_tokens_prompt
435
native_tokens_completion
859
native_tokens_completion_images
(null)
native_tokens_reasoning
43
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
0.02365
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_01MxRbuwJrx78ywycbZmNKwa"
is_byok
false
latency
1045
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-1780314548-MWM76esAPSCuE6pRL4QG"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1780314548-ql0nUcRtxj2I63rv2hcj"
upstream_id
"msg_01MxRbuwJrx78ywycbZmNKwa"
total_cost
0.02365
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