Run: 2026-10-08-01M4DA0DF7XJKD3R51TC5H5A5F

Run Details

Duration:
2.3s
Cost:
$0.000130
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
59.97% 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 rain had not stopped for three days. Detective Mara Voss stood alone outside the manor. Yellow tape fluttered across the iron gate like tired ribbons. Inside, the housekeeper sobbed quietly into a damp handkerchief. Someone had left the library window open all night. Mara noticed muddy footprints leading toward the carriage house. Each print pointed away from the body, not toward it. Her partner, Detective Jonas Reed, arrived with two steaming coffees. He handed one to her without speaking. Together they climbed the wide, creaking staircase slowly. At the top, a single candle still burned. Its flame bent toward an open bedroom door. Beyond that door lay Lord Ashworth, motionless upon the rug.
created_at"2026-10-08T08:27:49.614Z" 10/8/2026, 8:27:49 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency719
moderation_latency(null)
generation_time2291
tokens_prompt46
tokens_completion177
native_tokens_prompt62
native_tokens_completion247
native_tokens_completion_images(null)
native_tokens_reasoning0
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"
usage0.0001297
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448069-aMuQXHgkt1hiQV1ibETS"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448069-qhTWRSFO4QTIivUdXNJw"
upstream_id"msg_011CfpTGbvhsBCGZsR7qwZfq"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTGbvhsBCGZsR7qwZfq"
is_byokfalse
latency719
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0001297
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
59.97% Matches word count n/a
neededCleanfalse
sentences13
wordCounts
08
18
210
39
49
59
610
710
87
98
108
118
1210