Run: 2026-05-31-01KSYXNSZS71HW8Q50B5WE9AMZ

Run Details

Duration:
16.4s
Cost:
$0.044800
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 grand mansion's windows. Detective Sarah Mills arrived just before the clock struck midnight. A single body lay sprawled across the cold marble floor. Dark blood pooled slowly beneath the wealthy old man's head. Sarah knelt down and carefully studied the lifeless pale face. Someone had clearly wanted this rich man dead very badly. The tall grandfather clock ticked loudly in the silent room. Five frightened guests waited nervously upstairs, each hiding dark secrets. Sarah slowly stood up, knowing one of them was guilty. The long, dark night of questions had only just begun.
created_at"2026-05-31T11:45:58.79Z" 5/31/2026, 11:45:58 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3581
moderation_latency(null)
generation_time16359
tokens_prompt46
tokens_completion277
native_tokens_prompt60
native_tokens_completion1780
native_tokens_completion_images(null)
native_tokens_reasoning123
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"
usage0.0448
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_017qKndDsFkfpNVbsBSC1G5v"
is_byokfalse
latency992
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-1780227958-wqiyh77whw6Yk02PSPxU"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227958-uKZunUFtnBQy6uxJgHZF"
upstream_id"msg_017qKndDsFkfpNVbsBSC1G5v"
total_cost0.0448
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