Run: 2026-10-08-01M4DYNXVJJ3PCYFK2JG688TP6

Run Details

Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
9.7s
Cost:
$0.000841
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The rain had fallen on Ashford Manor for three relentless days, and nobody inside the old house slept soundly anymore. Detective Inspector Harold Vance arrived at dawn that morning, carrying his worn leather case and a cup of cold tea. Lord Edmund Thorne lay face down in the library, a silver letter opener protruding from his bloodied back last night. Every guest in the house had a motive, and Vance intended to find out which one of them was lying.
created_at"2026-10-08T14:29:06.044Z" 10/8/2026, 2:29:06 PM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2896
moderation_latency(null)
generation_time9706
tokens_prompt46
tokens_completion306
native_tokens_prompt62
native_tokens_completion1670
native_tokens_completion_images(null)
native_tokens_reasoning1514
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"
usage0.0008412
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791469746-BTTfYUWn2jmU55bp5mDg"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791469746-ThgK8TxGlJbycAyBUdVL"
upstream_id"msg_011CfpvpV5jJnAETC2rXLtHM"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpvpV5jJnAETC2rXLtHM"
is_byokfalse
latency1096
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0008412
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
sentences4
wordCounts
020
120
220
320