Run: 2026-05-29-01KSSJMWGBVERH9JY5TABFAWC4

Run Details

Duration:
15.9s
Cost:
$0.038425
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
Rain hammered against the old mansion windows all night long. Detective Harlow arrived just before the old clock struck midnight. The butler greeted him with a pale and trembling face. Inside the grand study lay the body of Lord Ashford. Dark blood pooled slowly across the polished mahogany wooden floor. A silver letter opener protruded from his cold still chest. Five frightened guests remained trapped inside by the relentless storm. Each one of them harbored secrets worth killing a man. Harlow knelt beside the cold corpse and studied every detail. Someone inside this house was certainly a cold-blooded ruthless murderer.
created_at"2026-05-29T09:57:02.1Z" 5/29/2026, 9:57:02 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3839
moderation_latency(null)
generation_time15825
tokens_prompt46
tokens_completion290
native_tokens_prompt60
native_tokens_completion1525
native_tokens_completion_images(null)
native_tokens_reasoning126
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"
usage0.038425
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01WchxEsRc4RokZoiFtSsro3"
is_byokfalse
latency1078
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-1780048622-egDiUtoJR3DKwAKvXSKc"
session_id(null)
api_type"completions"
id"gen-1780048622-ef95HDr6kYTOxWlofdYb"
upstream_id"msg_01WchxEsRc4RokZoiFtSsro3"
total_cost0.038425
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