Run: 2026-05-31-01KSYXHHESV34RGX2K86A1XEZX

Run Details

Duration:
9.3s
Cost:
$0.007525
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered the old mansion. Detective Cole arrived after midnight. The front door stood open. Inside, silence felt unnervingly heavy. A single lamp cast shadows. Blood pooled near the staircase. The victim lay face down. His expensive suit was ruined. Cole knelt beside the body. Cold fingers clutched a note. "They know" read the message. Footsteps echoed from upstairs somewhere. Cole reached for his weapon. The lights suddenly went dark. Something moved within the shadows. His heart pounded against ribs. A floorboard creaked behind him. He spun around too late. Three suspects waited that night. One of them was lying.
created_at"2026-05-31T11:43:38.981Z" 5/31/2026, 11:43:38 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5805
moderation_latency(null)
generation_time9226
tokens_prompt46
tokens_completion232
native_tokens_prompt60
native_tokens_completion289
native_tokens_completion_images(null)
native_tokens_reasoning42
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"
usage0.007525
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01AFmMmygsdDyNZ7VT7axQTq"
is_byokfalse
latency4763
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-1780227818-l1AOh6UzUWp7MgCDE575"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227818-aco28suKJqGJ2FB123SV"
upstream_id"msg_01AFmMmygsdDyNZ7VT7axQTq"
total_cost0.007525
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
sentences20
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195