Run: 2026-05-29-01KSSK4XA4TT6YF1XATHRAHYFN

Run Details

Duration:
12.9s
Cost:
$0.029500
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered against the old mansion windows late that night. Detective Sarah Coyle arrived just as the violent storm worsened. The body lay sprawled across the cold polished marble floor. Blood pooled slowly beneath the man's head, dark and thick. Nobody in the gathered, frightened crowd dared speak first now. Sarah studied each pale, anxious face for signs of guilt. Outside, the thunder cracked like a warning from the heavens. Someone here had killed tonight, and that someone was watching.
created_at"2026-05-29T10:05:47.212Z" 5/29/2026, 10:05:47 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3640
moderation_latency(null)
generation_time12853
tokens_prompt46
tokens_completion278
native_tokens_prompt60
native_tokens_completion1168
native_tokens_completion_images(null)
native_tokens_reasoning148
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"
usage0.0295
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01WwE89w7mfxvFdYRuapibJ4"
is_byokfalse
latency1012
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-1780049147-w76YQ3MtXsd8BDfl8fgB"
session_id(null)
api_type"completions"
id"gen-1780049147-kCghz3KOQRofFPZfgvMR"
upstream_id"msg_01WwE89w7mfxvFdYRuapibJ4"
total_cost0.0295
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
010
110
210
310
410
510
610
710