Run: 2026-09-23-01M37P1CHJRZH6A8MX5A5DKB2G

Run Details

Duration:
15.8s
Cost:
$0.030128
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
Rain hammered the windows of Blackwood Manor all night long. Inside, the grandfather clock struck midnight with a hollow groan. Eleanor Hart descended the staircase, clutching a flickering silver candle. She had heard a scream, sharp and sudden, then silence. The study door stood ajar, spilling pale light into darkness. Her uncle Reginald lay slumped across his mahogany writing desk. A thin ribbon of blood trickled down his pale temple. His fountain pen still rested between his cold, stiff fingers. Eleanor noticed the window was firmly locked from the inside. Yet the fireplace poker lay gleaming wetly upon the rug. Behind her, footsteps creaked softly across the old oak floorboards. She turned slowly, and the candle flame suddenly went out. "Nobody leaves this house tonight," whispered a voice she recognized.
created_at"2026-09-23T17:46:55.939Z" 9/23/2026, 5:46:55 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4631
moderation_latency(null)
generation_time15791
tokens_prompt46
tokens_completion415
native_tokens_prompt62
native_tokens_completion1494
native_tokens_completion_images(null)
native_tokens_reasoning1198
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"
usage0.030128
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790185615-PksskbATJNXQGgSUG2pI"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790185615-WtB8sDh9EzblmJjovLWr"
upstream_id"msg_011CfLnmiC9ZjX9mk4VigGuo"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLnmiC9ZjX9mk4VigGuo"
is_byokfalse
latency1343
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.030128
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
sentences13
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1210