Run: 2026-05-31-01KSYXC3SMTYKJ25WFMPPB7JCF

Run Details

Duration:
23.9s
Cost:
$0.060575
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 rain fell hard against the manor windows as Detective Sarah Mills stepped carefully across the slick stone threshold tonight. Inside the grand foyer, a single chandelier flickered dimly above the body sprawled awkwardly upon the cold marble floor below. Mr. Harold Pennington, the wealthy owner of this grand estate, lay quite motionless with dark crimson blood pooling beneath him. Sarah crouched low beside the corpse, her gloved fingers searching gently for any clue the killer had carelessly left behind. A grandfather clock chimed midnight while five frightened guests gathered nervously inside the adjoining parlor, awaiting her difficult questions now. Each of them possessed both a motive and an opportunity, yet only one among them had truly committed the murder.
created_at"2026-05-31T11:40:41.153Z" 5/31/2026, 11:40:41 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3912
moderation_latency(null)
generation_time23881
tokens_prompt46
tokens_completion317
native_tokens_prompt60
native_tokens_completion2411
native_tokens_completion_images(null)
native_tokens_reasoning123
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"
usage0.060575
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01TNL9Pn8oFxnw9NstJsK5Yb"
is_byokfalse
latency1406
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-1780227641-AwuKQG07HDu0VNE4H9Vc"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227641-wkLRW1uaVHgJddfmywev"
upstream_id"msg_01TNL9Pn8oFxnw9NstJsK5Yb"
total_cost0.060575
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