Run: 2026-05-31-01KSYXJM31B2108RZ309Q18GS6

Run Details

Duration:
45.4s
Cost:
$0.117450
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 manor windows as Detective Sarah Cole stepped slowly across the creaking wooden floor. A single lifeless body lay sprawled beneath the grand staircase, blood pooling darkly across the priceless antique Persian carpet below. The wealthy old victim, Lord Edmund Harrington, had hosted twelve dinner guests tonight, and each one was a prime suspect. Sarah crouched down low beside the corpse and noticed something glinting faintly within the dead man's tightly clenched right hand. She carefully pried the cold stiff fingers apart and discovered a small silver locket engraved with two unfamiliar golden initials. Outside, thunder cracked violently overhead as the manor's heavy front door suddenly burst open, revealing a soaked, trembling young figure. Sarah rose slowly to her feet, her hand instinctively reaching toward her holster, knowing this terrible night had just begun.
created_at"2026-05-31T11:44:14.444Z" 5/31/2026, 11:44:14 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3933
moderation_latency(null)
generation_time45334
tokens_prompt46
tokens_completion648
native_tokens_prompt60
native_tokens_completion4686
native_tokens_completion_images(null)
native_tokens_reasoning408
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"
usage0.11745
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_019diXyXkjLPdYooGoTCxLTk"
is_byokfalse
latency1238
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-1780227854-DF2byAhpqFHAKC23ZrKx"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227854-Mrm408hleYW1UsjWT8jF"
upstream_id"msg_019diXyXkjLPdYooGoTCxLTk"
total_cost0.11745
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
sentences7
wordCounts
020
120
220
320
420
520
620