Run: 2026-09-23-01M37P9GBCANWT5AEK2GAEWT83

Run Details

Duration:
18.1s
Cost:
$0.036248
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 gathered nervously around the dying fireplace embers. Nobody had seen Lord Ashford since dinner ended hours ago. His wife, Margaret, insisted that he had simply gone walking. But no sane man would walk through such violent rain. The butler, Graves, stood silently beside the tall library door. His gloved hands trembled slightly, though his face remained calm. Then a scream echoed down from the east wing corridor. Everyone rushed upstairs, candles flickering wildly in the cold draft. The young maid, Elsie, pointed toward the open study door. Lord Ashford lay sprawled across his desk, his eyes open. A silver letter opener protruded from beneath his left shoulder. Margaret did not scream; she only whispered one strange word. Somewhere below, the grandfather clock began to chime three times. And every guest realized the killer was standing among them.
created_at"2026-09-23T17:51:21.98Z" 9/23/2026, 5:51:21 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4158
moderation_latency(null)
generation_time18098
tokens_prompt46
tokens_completion504
native_tokens_prompt62
native_tokens_completion1800
native_tokens_completion_images(null)
native_tokens_reasoning1461
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"
usage0.036248
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790185881-q4HKDQOdbLO9TkQ8klc6"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790185881-SWL3GCiZdI2hFYkIUSfT"
upstream_id"msg_011CfLo7KTiso75EXj4QguWU"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLo7KTiso75EXj4QguWU"
is_byokfalse
latency1270
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.036248
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
sentences16
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1210
1310
1410
1510