Run: 2026-05-29-01KSSK9X0FW1VM330GR347TSSQ

Run Details

Duration:
20.5s
Cost:
$0.052650
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 hammered against the old manor windows as Detective Sarah Cole stepped from her car into the October chill. Inside the grand foyer, a body lay sprawled across the cold marble floor, with crimson pooling slowly beneath the chandelier. The victim, wealthy industrialist Charles Pemberton, stared lifelessly upward, his expensive silk tie loosened and his pale fingers strangely curled. Around him gathered seven nervous guests, each clutching a secret, each watching Sarah approach with thinly veiled and growing dread. Thunder cracked overhead as she crouched beside him, noting the shattered wine glass glinting amid the scattered playing cards nearby. She rose slowly, her sharp gaze sweeping across the faces, searching each expression for guilt, fear, or carefully practiced innocence. Someone in this opulent room had committed murder tonight, and Sarah intended to unmask them before the storm finally passed.
created_at"2026-05-29T10:08:30.742Z" 5/29/2026, 10:08:30 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3808
moderation_latency(null)
generation_time20461
tokens_prompt46
tokens_completion457
native_tokens_prompt60
native_tokens_completion2094
native_tokens_completion_images(null)
native_tokens_reasoning226
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"
usage0.05265
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01J2jd3xF2YDNjKoGoDqWvqa"
is_byokfalse
latency920
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-1780049310-GgF4G0mVFKCw34hZYzxp"
session_id(null)
api_type"completions"
id"gen-1780049310-JtgEeFzJPOF7sQxVwaTC"
upstream_id"msg_01J2jd3xF2YDNjKoGoDqWvqa"
total_cost0.05265
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