Run: 2026-05-31-01KSYX8107A6EFJTHVBQXAZDKR

Run Details

Duration:
32.0s
Cost:
$0.087800
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 cold rain hammered against the old mansion windows as Detective Sarah Cole stepped through the heavy oak front door. Inside, the lifeless body of wealthy businessman Charles Whitmore lay sprawled across the library floor near the cold marble fireplace. Dark blood pooled slowly beneath his head, staining the expensive Persian rug that had once cost him a small fortune. Sarah slowly knelt beside the corpse, careful not to disturb anything, and studied the strange wound on his pale neck. Whoever had killed poor Charles Whitmore did it quickly, silently, and with the precision of a truly experienced professional killer. Outside the violent storm raged even louder now, and somewhere in the vast house a frightened guest began to scream.
created_at"2026-05-31T11:38:27.431Z" 5/31/2026, 11:38:27 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3577
moderation_latency(null)
generation_time31734
tokens_prompt46
tokens_completion475
native_tokens_prompt60
native_tokens_completion3500
native_tokens_completion_images(null)
native_tokens_reasoning289
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"
usage0.0878
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01Wmu54xFBWA1cppX41pqt21"
is_byokfalse
latency1013
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-1780227507-QqoilQ90WpOU6foH49Lp"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227507-L2iMiTcaFYhim1vChxzl"
upstream_id"msg_01Wmu54xFBWA1cppX41pqt21"
total_cost0.0878
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