Run: 2026-09-29-01M3P2BAD321G6XBHJ4QM5EZKZ

Run Details

Model:
Claude Sonnet 5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
11.9s
Cost:
$0.013794
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
93.75% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered the manor windows. Detective Voss shook her umbrella. The butler opened the door. His hands were trembling badly. Where is the body, Finch? He whispered, "The library, madam." She climbed the creaking stairs. Painted ancestors watched her pass. Ashworth lay across the desk. A dagger pierced his chest. The window was locked tight. Voss knelt and studied him. He clutched a torn ribbon. Behind her, the clock stopped. Someone in this house lied. Voss smiled without any warmth. "Nobody leaves tonight," she said.
created_at"2026-09-29T07:51:26.377Z" 9/29/2026, 7:51:26 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency11896
moderation_latency(null)
generation_time11896
tokens_prompt46
tokens_completion313
native_tokens_prompt62
native_tokens_completion1367
native_tokens_completion_images(null)
native_tokens_reasoning1172
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"
usage0.013794
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668286-DQqUOsMPjFDK4XRhp90C"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668286-BIWk6ZSWsQEXir01WGIn"
upstream_id"msg_011CfXNDRPi3ahD17aWdDa4u"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNDRPi3ahD17aWdDa4u"
is_byokfalse
latency679
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.013794
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
93.75% Matches word count n/a
neededCleanfalse
sentences16
wordCounts
05
15
25
35
45
510
65
75
85
95
105
115
125
135
145
155