Run: 2026-06-01-01KT1J6EBBZT9X6S9MK92EC2D9

Run Details

Duration:
28.8s
Cost:
$0.080575
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 rain hammered against the old mansion windows, drumming a relentless rhythm that nobody inside seemed willing to acknowledge. Inside the grand dining hall, seven nervous guests sat frozen around the table, staring at the body slumped across it. Lord Ashford had been alive just moments ago, laughing loudly while raising his crystal wine glass toward the flickering chandelier. Now his pale face lay pressed against the white tablecloth, a thin trickle of blood staining the embroidered linen crimson. Detective Mara Vance stepped forward slowly, removing her wet leather gloves while scanning each shocked face for hidden guilty secrets. Somebody sitting in this beautiful, candlelit room had committed murder, and she intended to discover exactly who before midnight arrived.
created_at"2026-06-01T12:23:04.304Z" 6/1/2026, 12:23:04 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3750
moderation_latency(null)
generation_time28818
tokens_prompt46
tokens_completion417
native_tokens_prompt60
native_tokens_completion3211
native_tokens_completion_images(null)
native_tokens_reasoning220
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"
usage0.080575
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_016UAH9cBERP6v861pFJa4KQ"
is_byokfalse
latency1154
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-1780316584-HQoRNz3bYq58x5FjpPip"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780316584-uiqCGERNeYoiFZhcVUgF"
upstream_id"msg_016UAH9cBERP6v861pFJa4KQ"
total_cost0.080575
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