Run: 2026-09-23-01M37NYMCEQYE7PWPK3B708C7R

Run Details

Duration:
18.3s
Cost:
$0.035888
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
93.75% 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, the guests had gathered near the dying library fire. Nobody noticed when Lord Ashford quietly slipped away from them. The grandfather clock in the hallway chimed a single time. Then a scream echoed through the long corridors of stone. Margaret, the housekeeper, stood trembling at the open study door. Her candle shook, casting wild shadows across the paneled walls. Lord Ashford lay sprawled beside his desk, eyes staring upward. A silver letter opener protruded cleanly from his motionless chest. Detective Eleanor Graves pushed past the gasping guests without hesitation. She knelt beside the body and studied the strange wound. The window was locked, and the fireplace held only ash. Whoever killed him had walked in through the only door. Eleanor rose slowly and turned to face the frightened crowd. "One of you," she said quietly, "is a cold murderer." Outside, the storm raged on, sealing them all inside together.
created_at"2026-09-23T17:45:25.662Z" 9/23/2026, 5:45:25 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4958
moderation_latency(null)
generation_time18254
tokens_prompt46
tokens_completion486
native_tokens_prompt62
native_tokens_completion1782
native_tokens_completion_images(null)
native_tokens_reasoning1420
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"
usage0.035888
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790185525-iRyZxmcHmOzcc8dNdVsn"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790185525-W0gPHsUwk9cVXVIdBKel"
upstream_id"msg_011CfLnf4teoJimBJZxpX9f6"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLnf4teoJimBJZxpX9f6"
is_byokfalse
latency1459
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.035888
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
93.75% Matches word count n/a
neededCleanfalse
sentences16
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1210
1310
1410
1520