Run: 2026-05-29-01KSSK6KW5WZZVQ7MVW34MTJKR

Run Details

Duration:
15.3s
Cost:
$0.036075
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 cold rain hammered against the old mansion's tall windows. Detective Sarah Cole stepped slowly across the cold marble floor. A man's body lay sprawled near the foot of stairs. Blood pooled dark beneath his head on the red carpet. The frightened household staff gathered nervously in the grand hallway. Nobody dared to speak as Sarah carefully examined the scene. Outside, the thunder cracked and shook the trembling window panes. She knelt down low and studied the victim's pale face. Someone in this very house had committed a brutal murder. And Detective Sarah intended to find out who did it.
created_at"2026-05-29T10:06:43.084Z" 5/29/2026, 10:06:43 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3579
moderation_latency(null)
generation_time15224
tokens_prompt46
tokens_completion366
native_tokens_prompt60
native_tokens_completion1431
native_tokens_completion_images(null)
native_tokens_reasoning216
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"
usage0.036075
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01BqcaTWycpT8qcmDn7jSg7q"
is_byokfalse
latency1154
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-1780049203-47XUou5eiSBJfuGwE9kG"
session_id(null)
api_type"completions"
id"gen-1780049203-DJjgHKdaeqkZsUjzj6rh"
upstream_id"msg_01BqcaTWycpT8qcmDn7jSg7q"
total_cost0.036075
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