Run: 2026-05-29-01KSSK0JKCYZSK41C6V6VGZXT5

Run Details

Duration:
16.5s
Cost:
$0.042550
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
The rain fell hard against the old mansion windows tonight. Detective Marlowe stepped inside, shaking cold water off his coat. The body lay sprawled across the library's polished wooden floor. Lord Ashworth had clearly been dead for several long hours. A single silver candle flickered upon the nearby oak desk. Marlowe knelt beside the corpse and studied the bloody wound. Someone had struck him hard from behind, without any warning. Outside, the storm grew louder as thunder shook the walls. Five guests remained trapped inside the estate that fateful night. One of them, Marlowe knew, had surely committed this murder.
created_at"2026-05-29T10:03:25.174Z" 5/29/2026, 10:03:25 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4112
moderation_latency(null)
generation_time16494
tokens_prompt46
tokens_completion314
native_tokens_prompt60
native_tokens_completion1690
native_tokens_completion_images(null)
native_tokens_reasoning151
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"
usage0.04255
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01U8izKiUVSxRu4PPSZ2HAmk"
is_byokfalse
latency1134
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-1780049005-kcWJu10mcweBqpU1e4j0"
session_id(null)
api_type"completions"
id"gen-1780049005-8nhsxdegLOHNt72Lptmy"
upstream_id"msg_01U8izKiUVSxRu4PPSZ2HAmk"
total_cost0.04255
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
sentences10
wordCounts
010
110
210
310
410
510
610
710
810
910