Run: 2026-06-01-01KT1HEWGVZX3SFNJG3FHKMWXR

Run Details

Duration:
23.6s
Cost:
$0.064025
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 hammered against the old mansion windows as Detective Sarah Cole stepped carefully across the cold bloodstained marble floor. The lifeless body of wealthy banker Harold Whitmore lay sprawled beneath the staircase, his eyes still wide open with terror. Three guests remained in the silent house, each clutching secrets they desperately hoped the detective would never manage to uncover. Sarah knelt down beside the corpse, carefully noticing a torn photograph clenched tightly within the dead man's stiff pale fingers. Outside, the thunder rolled across the darkened sky while the killer waited patiently, hidden somewhere inside the vast shadowy estate.
created_at"2026-06-01T12:10:12.384Z" 6/1/2026, 12:10:12 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3747
moderation_latency(null)
generation_time23572
tokens_prompt46
tokens_completion361
native_tokens_prompt60
native_tokens_completion2549
native_tokens_completion_images(null)
native_tokens_reasoning195
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"
usage0.064025
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01WhBWfU9Ppb6HByxz8jWmiD"
is_byokfalse
latency1018
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-1780315812-Mlf0u9CPuZWDyVB78eU3"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780315812-7WtQFQkc9g71wpDVNjVT"
upstream_id"msg_01WhBWfU9Ppb6HByxz8jWmiD"
total_cost0.064025
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
sentences5
wordCounts
020
120
220
320
420