NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-09-23-01M37P7C2906ZQT0WY89WW6YWB
Run Details
Model:
Claude Opus 5.5 (Reasoning)
Test:
Dialogue tags
Scenario:
Write 500 words with 50% dialogue
Duration:
26.6s
Cost:
$0.043760
Provider:
Claude Platform on AWS
Evaluation summary
Score
Evaluator
Details Link
75.16%
Matches word count
(details)
32.93%
Dialogue to Total Word Ratio
(details)
54.0447%
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
Bill spread the blueprint across the dashboard of the van and weighed the corners down with four juice boxes. Molly squinted at it. "That's a placemat, Bill." "It's a placemat of the house. I drew it during brunch. Look. Front door, back door, bouncy castle." "Why is the bouncy castle bigger than the house?" "Because it's the threat, Molly. Forty kids in a sugar frenzy. You go in there without a plan, you come out with no eyebrows." Molly rubbed her temples. She had robbed a museum in Vienna. She had once stolen a racehorse by convincing it she was its mother. Now she was sitting in a stolen ice cream van across the street from Timmy Pendleton's seventh birthday party, because Bill had heard the Pendletons were rich and had "a gift situation." "Walk me through it," she said. "Right. At two o'clock, the magician arrives. That's me." Bill produced a top hat from under the seat. A dove fell out of it, looked around, and left through the window. "Was that planned?" "Nothing about Gerald is planned. Anyway, I do the show. For the big finale, I ask for a volunteer to help me make all the presents disappear." "And they just vanish." "Into my cape. Forty-two pockets. I sewed them myself." Molly lifted the cape. Several pockets were sewn shut. One contained a sandwich. "And me?" "You're the clown. The diversion. You make balloon animals until everybody's looking at you." "I can't make balloon animals." "Nobody can make balloon animals. You twist the balloon and tell them it's a giraffe. Kids respect confidence." Outside, a small girl in a tiara pressed her face against the van window and stared at them without blinking. Bill lowered his voice. "Avoid that one. That's Priya. She's security." "She's six." "She's six and she bit the last magician. The Pendletons didn't even fire her. They gave her a raise. Extra cake." Molly looked at the tiara girl. The tiara girl looked at Molly. Somewhere in the backyard, very faintly, a kazoo played something ominous. "Bill, what exactly is in these presents? What are we fencing?" He hesitated. "Mostly Lego. Some slime. There's a rumor of an electric scooter." "A rumor." "A strong rumor. The grandmother mentioned it on Facebook." "You're telling me I came out of a quiet retirement of crossword puzzles to steal slime from a first grader." "Premium slime, Molly. Glitter slime. It glows in the dark." He leaned in, eyes shining. "Do you know what that goes for on the playground market?" Molly sighed, reached into the glovebox, and pulled out a red rubber nose. She stared at it for a long, sad moment, the way a knight might stare at a sword he'd sworn never to lift again. Then she snapped it on. "If Priya bites me, I'm taking the scooter." "Deal," said Bill, and tipped his hat, and a second dove fell out.
created_at
"2026-09-23T17:50:12.06Z"
9/23/2026, 5:50:12 PM
model
"anthropic/claude-opus-5.5-20260921"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5242
moderation_latency
(null)
generation_time
26579
tokens_prompt
75
tokens_completion
923
native_tokens_prompt
95
native_tokens_completion
2169
native_tokens_completion_images
(null)
native_tokens_reasoning
1132
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
0.04376
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer
(null)
request_id
"req-1790185812-rGwGShQ1H8j4tdVy1ZDT"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1790185812-rliesl5iJHlXEDjyXYA3"
upstream_id
"msg_011CfLo2AaJ5RpycGFuVv6N5"
provider_responses
0
endpoint_id
"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id
"msg_011CfLo2AaJ5RpycGFuVv6N5"
is_byok
false
latency
1845
model_permaslug
"anthropic/claude-opus-5.5-20260921"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.04376
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Claude Platform on AWS"
response_cache_source_id
(null)
data_region
"global"
workspace_id
"97e315e5-d303-487d-83c1-83180e8a13d4"
Evaluation details
Result
Evaluator
Details
Meta Data
75.16%
Matches word count
n/a
neededClean
false
words
487
32.93%
Dialogue to Total Word Ratio
Ratio: 54.71%, Deviation: 4.71%
neededClean
false
wordsTotal
488
wordsDialogue
267
54.0447%