Run: 2026-09-29-01M3P2F1C4FYQWH1RGS6M0V1KF

Run Details

Duration:
14.2s
Cost:
$0.019074
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
83.33% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The fog rolled over Harrowgate Manor like a burial shroud, and somewhere inside, a clock struck midnight with grim finality. Inspector Lena Marsh stepped from her car, pulled her collar tight, and studied the crooked silhouette of the sleeping house. Constable Pike met her at the door, his face pale as candle wax beneath the dripping porch lamp's yellow glow. "Lord Aldous Harrowgate is dead, ma'am," he whispered, "found in the locked library with a silver dagger in his back." Lena frowned, because locked rooms rarely happened by accident, and murderers rarely trusted anyone else to keep their dark secrets. Inside the drawing room, six guests huddled near the dying fire, each one watching the others with glittering, suspicious eyes. One of them had killed tonight, Lena realized, and before the sun rose, she would surely learn exactly which one.
created_at"2026-09-29T07:53:28.204Z" 9/29/2026, 7:53:28 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3760
moderation_latency(null)
generation_time14204
tokens_prompt46
tokens_completion457
native_tokens_prompt62
native_tokens_completion1895
native_tokens_completion_images(null)
native_tokens_reasoning1592
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"
usage0.019074
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668408-iX0kruXigdamvOKAq4FR"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668408-Svp3fRcRDp5zD8BRcJB0"
upstream_id"msg_011CfXNNQBY96XfpgpweGNGh"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNNQBY96XfpgpweGNGh"
is_byokfalse
latency606
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.019074
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
83.33% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
020
120
220
340
420
520