Run: 2026-05-29-01KSSJZB1DC4NCNJX30R215MY1

Run Details

Duration:
41.2s
Cost:
$0.118100
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 cold heavy rain fell hard against the old mansion windows while Detective Sarah Collins slowly approached the front door. Inside the grand entrance hall, the lifeless body of wealthy patriarch George Whitmore lay sprawled across the cold marble floor. A single heavy silver candlestick rested beside him, its smooth base darkened with the unmistakable crimson stain of dried blood. Detective Collins knelt beside the cooling corpse, studying the deep wound while the heavy storm outside grew louder and angrier. Five frightened guests waited nervously inside the adjoining drawing room, each one harboring dark secrets that someone killed to protect. She rose slowly to her feet, turned toward the trembling crowd, and quietly knew one among them was the murderer.
created_at"2026-05-29T10:02:44.664Z" 5/29/2026, 10:02:44 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3754
moderation_latency(null)
generation_time41164
tokens_prompt46
tokens_completion677
native_tokens_prompt60
native_tokens_completion4712
native_tokens_completion_images(null)
native_tokens_reasoning485
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"
usage0.1181
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_018KytXJFQ2DA4Gk27nV8gqe"
is_byokfalse
latency1147
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-1780048964-ezXB2QNtA2gR0tOHTclv"
session_id(null)
api_type"completions"
id"gen-1780048964-NzIRQUBp5qO5tUCCEogh"
upstream_id"msg_018KytXJFQ2DA4Gk27nV8gqe"
total_cost0.1181
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
sentences6
wordCounts
020
120
220
320
420
520