Run: 2026-05-29-01KSSJHKCSSEPHQRSSVE5S9DFJ

Run Details

Duration:
45.9s
Cost:
$0.128925
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 fell heavily against the old mansion windows as Detective Sarah Mills stepped onto the creaking wooden porch. Inside the dimly lit study, the body of the wealthy businessman Charles Harrington lay sprawled across the ornate Persian rug. A single bullet wound had marked the victim's chest, and shattered glass glittered ominously beneath the flickering antique chandelier above. Sarah knelt down beside the lifeless body very carefully, her trained eyes scanning every detail of the gruesome bloody scene. The mansion belonged to a powerful family with countless secrets, and tonight one of those dangerous secrets had finally surfaced. Outside, thunder rumbled loudly across the darkened sky as five nervous guests waited anxiously inside the grand drawing room together. Each one of them had a clear motive, a hidden grudge, and absolutely no convincing alibi for this terrible night. Sarah took a deep, steadying breath, knowing that catching this clever killer would test every skill she had ever learned.
created_at"2026-05-29T09:55:14.468Z" 5/29/2026, 9:55:14 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3835
moderation_latency(null)
generation_time45876
tokens_prompt46
tokens_completion571
native_tokens_prompt60
native_tokens_completion5145
native_tokens_completion_images(null)
native_tokens_reasoning303
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"
usage0.128925
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01Vehcequ1bsGLvGhkfgmaem"
is_byokfalse
latency1017
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-1780048514-ynYttMT9946n3cQM6D3j"
session_id(null)
api_type"completions"
id"gen-1780048514-o1EzAPa80UPG1lSVBL7Q"
upstream_id"msg_01Vehcequ1bsGLvGhkfgmaem"
total_cost0.128925
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
sentences8
wordCounts
020
120
220
320
420
520
620
720