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Run: 2026-05-31-01KSYXSBS89JQ341118JEA0CWW
Run Details
Model:
Claude Opus 4.8 (Reasoning, High)
Test:
Dialogue tags
Scenario:
Write 200 words with 10% dialogue
Duration:
10.4s
Cost:
$0.013015
Provider:
Anthropic
Evaluation summary
Score
Evaluator
Details Link
90.48%
Matches word count
(details)
99.90%
Dialogue to Total Word Ratio
(details)
95.1916%
Overall
Model input
User/Human
You are a author of comedic heist books. Please write a 200 word scene that has 10% 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 crouched behind the bouncy castle, binoculars pressed to her face, watching the chaos of forty sugar-crazed children swarming the backyard like tiny, frosting-covered locusts. "The presents are by the gazebo," she whispered, adjusting her ridiculous clown disguise. "Stacked higher than last year's bank job." Bill, squeezed into a foam dinosaur costume that smelled faintly of someone else's regret, nodded grimly. He'd lost a rock-paper-scissors match for this, and the indignity stung worse than the polyester chafing his thighs. The plan was elegant in its simplicity. Molly would distract the parents with a balloon-animal demonstration so spectacularly incompetent that no responsible adult could look away. Meanwhile, Bill would waddle toward the gift mountain, scoop the booty into his hollowed-out dinosaur belly, and lumber to the getaway minivan parked suspiciously close to the swing set. What they hadn't accounted for was Timmy, the birthday boy, a seven-year-old with the dead-eyed stare of a seasoned interrogator and an unsettling knowledge of his present inventory. Bill reached for a glittery gift bag. Timmy materialized beside him, arms crossed. "That's not a real dinosaur," the child announced with cold certainty. Bill froze, sweat pooling in his foam snout, his entire criminal career flashing before his eyes, undone by a boy in a paper hat.
created_at
"2026-05-31T11:47:55.317Z"
5/31/2026, 11:47:55 AM
model
"anthropic/claude-4.8-opus-20260528"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1054
moderation_latency
(null)
generation_time
10400
tokens_prompt
77
tokens_completion
356
native_tokens_prompt
93
native_tokens_completion
502
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
0.013015
router
(null)
provider_responses
0
endpoint_id
"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id
"msg_01FjGqDVgsdnYrzTcxgGoVgy"
is_byok
false
latency
1054
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-1780228075-Xxss1vw7KNqKq78vRO3I"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1780228075-dfBtjcspNKAInR10IQft"
upstream_id
"msg_01FjGqDVgsdnYrzTcxgGoVgy"
total_cost
0.013015
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
90.48%
Matches word count
n/a
neededClean
false
words
210
99.90%
Dialogue to Total Word Ratio
Ratio: 8.22%, Deviation: 1.78%
neededClean
false
wordsTotal
219
wordsDialogue
18
95.1916%