Run: 2026-09-23-01M37Q9ZAVH9H0KDVEHFK709PH

Run Details

Duration:
18.7s
Cost:
$0.038808
Provider:
Claude Platform on AWS

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 storm arrived at Blackwood Manor just after midnight struck. Lightning split the sky above the old stone chapel roof. Inside, eight guests sat waiting in the dimly lit library. Their host, Lord Edmund Ashford, had not appeared for dinner. The butler, Graves, stood silently beside the crackling marble fireplace. Margaret Ashford checked her pearl watch for the third time. "Something is wrong," she whispered to no one in particular. Then a single scream echoed down from the east wing. Everyone froze, glasses halfway to their lips, eyes wide open. Graves was the first to reach the heavy oak staircase. The others followed, their footsteps thundering against the polished floorboards. At the study door, a young maid stood trembling violently. Her white apron was stained with something dark and wet. Beyond her, Lord Ashford lay slumped across his mahogany desk. A silver letter opener protruded from between his shoulder blades. The window was locked, and the only key was missing. Margaret turned slowly, studying each pale face in the corridor. One of them had killed him, and she knew it.
created_at"2026-09-23T18:09:05.904Z" 9/23/2026, 6:09:05 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4933
moderation_latency(null)
generation_time18597
tokens_prompt46
tokens_completion467
native_tokens_prompt62
native_tokens_completion1928
native_tokens_completion_images(null)
native_tokens_reasoning1556
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"
usage0.038808
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790186945-dzlF4Ghm5lpSSos9Hxxs"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790186945-EwCSbxb5zSxSApCBi62v"
upstream_id"msg_011CfLpTkFAF8cERcD3nLwWe"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLpTkFAF8cERcD3nLwWe"
is_byokfalse
latency1160
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.038808
cache_discount(null)
upstream_inference_cost0
provider_name"Claude Platform on AWS"
response_cache_source_id(null)
data_region"global"
workspace_id"97e315e5-d303-487d-83c1-83180e8a13d4"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences18
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1210
1310
1410
1510
1610
1710