Run: 2026-05-29-01KSSK3484T1BZ1NZY46QHCAGY

Run Details

Duration:
29.0s
Cost:
$0.075975
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 fell heavily against the old manor windows as Detective Sarah Croft stepped across the marble entrance hall. A lifeless body lay sprawled beneath the grand staircase, surrounded by shattered glass and a slowly spreading pool of blood. The murdered victim, wealthy patriarch Edmund Blackwood, had hosted a dinner party for seven guests just hours before his death. Now those frightened guests waited nervously in the drawing room, each one harboring secrets that might explain this terrible crime. Sarah knelt beside the cold corpse, noting the strange silver dagger embedded deep within Edmund Blackwood's once proud beating chest. Outside, the violent storm intensified further, trapping everyone inside the isolated estate until the morning, with no escape from justice.
created_at"2026-05-29T10:04:48.782Z" 5/29/2026, 10:04:48 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3554
moderation_latency(null)
generation_time28938
tokens_prompt46
tokens_completion480
native_tokens_prompt60
native_tokens_completion3027
native_tokens_completion_images(null)
native_tokens_reasoning274
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"
usage0.075975
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01Xrm2sRRu5vPrvhaEJaxHij"
is_byokfalse
latency1046
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-1780049088-l6hUsur6W0ZFhaRWM3cx"
session_id(null)
api_type"completions"
id"gen-1780049088-paHDUq4dccj8L5qdn7tk"
upstream_id"msg_01Xrm2sRRu5vPrvhaEJaxHij"
total_cost0.075975
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