NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-05-31-01KSYXNS114GJQWDQMGFMXNGR7
Run Details
Model:
Claude Opus 4.8 (Reasoning, High)
Test:
Dialogue tags
Scenario:
Write 500 words with 50% dialogue
Duration:
18.9s
Cost:
$0.027315
Provider:
Anthropic
Evaluation summary
Score
Evaluator
Details Link
98.71%
Matches word count
(details)
0.00%
Dialogue to Total Word Ratio
(details)
49.3562%
Overall
Model input
User/Human
You are a author of comedic heist books. Please write a 500 word scene that has 50% words of dialogue between two thieves named Molly and Bill who are planning to break into a children's party to steal all the presents. Only include the prose of the scene without any markdown or commentary.
Model response
Messages
Meta
AI
Molly spread the blueprint across the table, smoothing out the crayon-stained edges. It wasn't a blueprint, exactly. It was a placemat from a pizza restaurant with a maze on it. "This is our intel?" Bill picked it up and squinted. "Molly, this is a cartoon mouse trying to find cheese." "Look past the mouse, Bill. The mouse is irrelevant. Focus on the layout of the house I drew on the back." He flipped it over. "You drew the house on a napkin and taped it to the mouse maze." "I'm resourceful," Molly said, snatching it back. "Now pay attention. The party starts at two. Little Timmy Henderson is turning seven, which means premium loot. We're talking action figures, gift cards, possibly a bicycle." "A bicycle." Bill leaned back, intrigued despite himself. "I've always wanted a bicycle." "You're forty-three." "And I've never owned a bicycle. That's tragic, Molly. That's the real crime here." She ignored him. "The presents will be stacked in the living room. Our window is during the magician's act. Every kid will be staring at the guy pulling rabbits out of a hat." "What's our cover?" Molly grinned and pulled two costumes from a duffel bag. She tossed one to Bill. He held it up, his face falling. "A clown. You want me to be a clown." "Birthday parties love clowns. We walk in, nobody questions a clown. We do a few balloon animals, we case the joint, then we load the gifts into our oversized clown van." "We don't have a clown van." "We have a Honda Civic with a clown sticker I'm going to apply this afternoon." Bill set the costume down with the reverence of a man surrendering. "Molly, I have a question, and I want you to really think about it before you answer." "Shoot." "Are we stealing presents from a seven-year-old?" There was a pause. Molly chewed her lip. "When you say it like that, it sounds bad." "There's no good way to say it. It's children's presents. We're going to ruin a child's birthday." "Okay, but consider this." Molly held up a finger. "The presents are insured under his parents' homeowner policy. Probably. So really we're stealing from an insurance company, and everybody hates insurance companies." "That's not how insurance works." "Do you know how insurance works?" Bill opened his mouth, then closed it. "No. But I feel like that's not how it works." "Exactly. Uncertainty. The thief's greatest ally." She began stuffing a red foam nose into her pocket. "Look, we hit the party, we grab the loot, and within the hour you're riding a brand-new bicycle into the sunset. Tell me that doesn't sound beautiful." Bill considered it. He pictured the wind in his hair, the spokes spinning, a freedom he'd never known. "Fine," he said quietly. "But I'm keeping the bicycle." "Obviously. I don't want a child's bicycle. I have standards." "You're robbing his birthday." "Standards within reason, Bill." She tossed him the wig. "Now put on the nose. We've got a magician to outsmart."
created_at
"2026-05-31T11:45:57.806Z"
5/31/2026, 11:45:57 AM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1051
moderation_latency
46
generation_time
18806
tokens_prompt
77
tokens_completion
783
native_tokens_prompt
93
native_tokens_completion
1074
native_tokens_completion_images
(null)
native_tokens_reasoning
0
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
0.027315
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_019XLmjw5fR347pFAQjP2N16"
is_byok
false
latency
1051
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-1780227957-AhFYkBdWAJbxv8YdZsQk"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1780227957-a6NUmbXDcWD60qCGAPn0"
upstream_id
"msg_019XLmjw5fR347pFAQjP2N16"
total_cost
0.027315
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
98.71%
Matches word count
n/a
neededClean
false
words
506
0.00%
Dialogue to Total Word Ratio
Ratio: 71.62%, Deviation: 21.62%
neededClean
false
wordsTotal
511
wordsDialogue
366
49.3562%