Run: 2026-05-31-01KSYXRQGZJ8QJSQB3ZRX8V6A8

Run Details

Duration:
12.3s
Cost:
$0.029025
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's tall windows. Detective Sarah Cole arrived just before the clock struck midnight. The butler opened the heavy door without saying a word. Inside, the guests stood frozen around the cold marble staircase. A body lay sprawled upon the floor, blood still warm. The wealthy host, Mister Albert Crane, was clearly quite dead. Sarah knelt down slowly, examining the wound with sharp eyes. Someone here tonight had committed this terrible, calculated, brutal murder. Every face revealed a secret hidden behind a nervous smile. The killer remained among them, watching, waiting, breathing very calmly.
created_at"2026-05-31T11:47:34.573Z" 5/31/2026, 11:47:34 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3059
moderation_latency(null)
generation_time12196
tokens_prompt46
tokens_completion282
native_tokens_prompt60
native_tokens_completion1149
native_tokens_completion_images(null)
native_tokens_reasoning122
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"
usage0.029025
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01Vrq5A6RUYDveShadYHvGva"
is_byokfalse
latency1027
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-1780228054-y3cBmsORmmaUsljRiJTH"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780228054-WOLX0BpQYY1jHlRRyiaG"
upstream_id"msg_01Vrq5A6RUYDveShadYHvGva"
total_cost0.029025
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