Run: 2026-05-31-01KSYXD93F0MF0RTK0HG29QK6N

Run Details

Duration:
26.1s
Cost:
$0.069875
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The rain fell heavily against the old manor windows, blurring the dim glow of the streetlamps lining the gravel drive. Detective Sarah Mills stepped out from her car, pulling her thin coat tighter against the cold, unforgiving wind howling outside. Inside the grand hall, the body of the wealthy patriarch Charles Whitmore lay sprawled across the cold marble floor, lifeless. A single crystal goblet rested beside his outstretched hand, its dark contents spilled and staining the expensive Persian rug nearby. Five nervous guests huddled together near the fireplace, their faces pale with shock, none daring to speak the obvious truth. Sarah knelt down beside the corpse, examining the faint blue tinge around his lips, certain this death was no accident. Someone inside this very room had carefully planned and executed a cold murder, and she intended to expose them tonight.
created_at"2026-05-31T11:41:19.357Z" 5/31/2026, 11:41:19 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3624
moderation_latency(null)
generation_time26058
tokens_prompt46
tokens_completion398
native_tokens_prompt60
native_tokens_completion2783
native_tokens_completion_images(null)
native_tokens_reasoning168
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"
usage0.069875
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01L2T5p5C76xqh23eGD8Bhtq"
is_byokfalse
latency1157
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-1780227679-IxxnmipioZkyLtLCi2AH"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227679-JUReBb3SX1NxV9Kfwdzi"
upstream_id"msg_01L2T5p5C76xqh23eGD8Bhtq"
total_cost0.069875
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
sentences7
wordCounts
020
120
220
320
420
520
620