Run: 2026-05-31-01KSYXCYAF3T9X4EQQ16BQJNMW

Run Details

Duration:
12.1s
Cost:
$0.027575
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 10 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 old mansion's tall windows. Detective Sarah Morgan stepped slowly through the creaking front door. The body lay sprawled across the cold marble floor below. Blood pooled darkly beneath the wealthy banker's lifeless, pale hand. Candlelight flickered weakly, casting long shadows across the silent room. Sarah knelt beside him, studying the strange wound quite carefully. Outside, thunder rolled across the dark sky like distant warning. Five guests waited nervously upstairs, unaware of the grim discovery. Each one harbored secrets worth killing for that stormy night. Someone among them had committed this cold, calculated, brutal murder.
created_at"2026-05-31T11:41:08.318Z" 5/31/2026, 11:41:08 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4080
moderation_latency(null)
generation_time12029
tokens_prompt46
tokens_completion279
native_tokens_prompt60
native_tokens_completion1091
native_tokens_completion_images(null)
native_tokens_reasoning111
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"
usage0.027575
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_011HzR61WWz1VcSPzgugibFR"
is_byokfalse
latency1520
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-1780227668-gODlLGQcQor4hheuiwvK"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227668-FRXDFoD0cg47Qf9LAOEW"
upstream_id"msg_011HzR61WWz1VcSPzgugibFR"
total_cost0.027575
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
sentences10
wordCounts
010
110
210
310
410
510
610
710
810
910