Run: 2026-06-01-01KT1GVTVTJG5WTTBSZPJ267A3

Run Details

Duration:
42.2s
Cost:
$0.120900
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 steadily against the tall windows of Blackwood Manor as Detective Sarah Chen approached the heavy oak door. Inside the dimly lit study, the lifeless body of wealthy businessman Edward Hartwell lay sprawled across his elegant Persian rug. A single bullet wound had marred his broad chest, and his cold eyes stared blankly toward the crackling fireplace nearby. Sarah pulled on her leather gloves slowly, carefully scanning the entire room while three nervous guests watched from the hallway. The grieving widow, the business partner, and the estranged son each claimed they had never left the crowded dinner party. But someone hidden inside this isolated manor was clearly lying, and Sarah intended to uncover the deadly truth before midnight.
created_at"2026-06-01T11:59:48.102Z" 6/1/2026, 11:59:48 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3355
moderation_latency(null)
generation_time42219
tokens_prompt46
tokens_completion546
native_tokens_prompt60
native_tokens_completion4824
native_tokens_completion_images(null)
native_tokens_reasoning348
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"
usage0.1209
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01DXENBJnoGas8T5BkAc3qtq"
is_byokfalse
latency1211
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-1780315188-dsVHqGALE0ntRA09EVoe"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780315188-4cY90WYh8rVHLrb9rBxy"
upstream_id"msg_01DXENBJnoGas8T5BkAc3qtq"
total_cost0.1209
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