Run: 2026-05-29-01KSSJHX47XGSVVMKN9EBQYAW9

Run Details

Duration:
14.2s
Cost:
$0.035075
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 Marlowe arrived just before midnight, soaked and very tired. A single body lay sprawled across the cold marble floor. Blood pooled slowly beneath the dead victim's pale, lifeless hand. The frightened guests huddled together near the grand stone staircase. Nobody dared speak a word as Marlowe slowly studied them. Somewhere among them hid a cold and ruthless, calculating killer. Marlowe removed his wet hat and prepared to find them.
created_at"2026-05-29T09:55:24.436Z" 5/29/2026, 9:55:24 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3446
moderation_latency(null)
generation_time14105
tokens_prompt46
tokens_completion226
native_tokens_prompt60
native_tokens_completion1391
native_tokens_completion_images(null)
native_tokens_reasoning95
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"
usage0.035075
router(null)
provider_responses
0
endpoint_id"dfc0e5bd-d703-4fe2-a7bb-655eb95d5441"
id"msg_01Bhe66zoQdiWduBL6MS8AFM"
is_byokfalse
latency990
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-1780048524-5faBHltp5q6bdQEK7YXM"
session_id(null)
api_type"completions"
id"gen-1780048524-d01eFq2JY0delEqfsyno"
upstream_id"msg_01Bhe66zoQdiWduBL6MS8AFM"
total_cost0.035075
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