NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-05-29-01KSSK75JP4Q2XZEDQT4266TH1
Run Details
Model:
Claude Opus 4.8 (Reasoning)
Test:
Dialogue tags
Scenario:
Write 200 words with 90% dialogue
Duration:
10.8s
Cost:
$0.012940
Provider:
Anthropic
Evaluation summary
Score
Evaluator
Details Link
100.00%
Matches word count
(details)
93.94%
Dialogue to Total Word Ratio
(details)
96.9702%
Overall
Model input
User/Human
You are a author of comedic heist books. Please write a 200 word scene that has 90% 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
"So we're really doing this?" Molly asked. "Stealing from children? Absolutely." "Bill, that's monstrous." "They're rich children, Molly. Their presents are basically tiny investments." "How do we get in?" "I've got two clown costumes." "You hate clowns." "I despise clowns. But sacrifices must be made for art." "This isn't art. This is grand theft toy." "Same energy," Bill said. "Now, the party starts at two. Cake at three. Present-opening at four." "And we strike when?" "During musical chairs. Pure chaos. Nobody watches the gift table when there's a chair shortage." "What about the parents?" "Distracted. Filming everything. Half of them will be drunk on box wine." "At a children's party?" "You've clearly never met suburban parents." Molly frowned. "What's our exit?" "The bouncy castle out back. We toss the bags over the fence, slide down the inflatable slide, gone in sixty seconds." "That's ridiculous." "That's genius." "What if a kid recognizes us?" "Children can't testify, Molly. They still believe in the tooth fairy." "You're a terrible person." "I'm a professional," Bill corrected. "Now put on the wig." "It smells like sadness." "That's the smell of money." "Fine," Molly sighed. "But I'm keeping the dinosaur one." "Obviously. That dinosaur's mine."
created_at
"2026-05-29T10:07:01.214Z"
5/29/2026, 10:07:01 AM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1324
moderation_latency
(null)
generation_time
10628
tokens_prompt
77
tokens_completion
366
native_tokens_prompt
93
native_tokens_completion
499
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
0.01294
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
is_byok
false
latency
188
model_permaslug
"anthropic/claude-4.8-opus-20260528"
provider_name
"Anthropic"
status
429
1
endpoint_id
"dfc0e5bd-d703-4fe2-a7bb-655eb95d5441"
id
"msg_0168muLgPRTWiooMEWvr9Rfs"
is_byok
false
latency
1324
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-1780049221-n1jGNkZY8ozua2YgM3mh"
session_id
(null)
api_type
"completions"
id
"gen-1780049221-DiE1RKMvg0vCNDPHIIsq"
upstream_id
"msg_0168muLgPRTWiooMEWvr9Rfs"
total_cost
0.01294
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
words
199
93.94%
Dialogue to Total Word Ratio
Ratio: 95.00%, Deviation: 5.00%
neededClean
false
wordsTotal
200
wordsDialogue
190
96.9702%