Run: 2026-05-29-01KSSK9VJNF3NDPK71F620XVAB

Run Details

Duration:
23.9s
Cost:
$0.065000
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 windows of the old mansion, drowning out every sound except the wind's mournful howling. Detective Marlowe stepped slowly inside, removing his soaked hat while quietly studying the grand foyer with its flickering chandelier above. The lifeless body lay sprawled across the marble staircase, one arm reaching upward as though pleading for someone's desperate help. Around the cold corpse, five guests stood frozen, their pale faces betraying secrets that the storm could never wash away. Marlowe knelt down beside the lifeless victim, noting the thin blade buried deep within the chest, glinting under dim light. He glanced slowly upward, scanning each suspect carefully, knowing that one among them had committed this terrible, calculated, bloody crime.
created_at"2026-05-29T10:08:29.28Z" 5/29/2026, 10:08:29 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3557
moderation_latency(null)
generation_time23517
tokens_prompt46
tokens_completion349
native_tokens_prompt60
native_tokens_completion2588
native_tokens_completion_images(null)
native_tokens_reasoning153
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"
usage0.065
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01S8iv6PXW3W7v1HsBsasMYb"
is_byokfalse
latency1021
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-1780049309-4IIPYLPgwQ8ymTuNRqb0"
session_id(null)
api_type"completions"
id"gen-1780049309-3n0vHFN62pAD09c22ow4"
upstream_id"msg_01S8iv6PXW3W7v1HsBsasMYb"
total_cost0.065
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