Run: 2026-06-01-01KT1G4YD9Z0MT83YTC7Z1WEM1

Run Details

Duration:
36.4s
Cost:
$0.040925
Provider:
Anthropic

Evaluation summary

Score Evaluator
Details Link
100.00% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The rain fell hard against the old mansion's tall windows. Detective Sarah Cole arrived just before the midnight hour struck. Inside the grand hall, a body lay cold and still. Dark blood pooled slowly across the polished marble floor below. The victim was Charles Ashworth, the wealthy old estate owner. Five nervous guests remained inside, each hiding their dark secrets. Sarah studied the silent room, noting every suspicious small detail. Someone inside this very house was a cold, calculating killer. The raging storm ensured nobody could leave until early morning. Sarah took a deep breath and slowly began her investigation.
created_at"2026-06-01T11:47:18.069Z" 6/1/2026, 11:47:18 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4014
moderation_latency(null)
generation_time36371
tokens_prompt46
tokens_completion268
native_tokens_prompt60
native_tokens_completion1625
native_tokens_completion_images(null)
native_tokens_reasoning94
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"end_turn"
service_tier"default"
usage0.040925
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01E2TY4424GvjaWWTvKQkePM"
is_byokfalse
latency1230
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer(null)
request_id"req-1780314438-DHW2l5MvFZjtqpHrG7Ny"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780314438-apKlU88mOGfZ8H9RCO2V"
upstream_id"msg_01E2TY4424GvjaWWTvKQkePM"
total_cost0.040925
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
010
110
210
310
410
510
610
710
810
910