Run: 2026-09-29-01M3P2H63EXFC4GPAWYQ8SSD6V

Run Details

Model:
Claude Sonnet 5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
9.8s
Cost:
$0.011814
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered the manor's windows. Inspector Hale shook his coat. The butler waited in silence. Lord Ashworth lay dead upstairs. Someone had stabbed him once. Hale climbed the creaking stairs. Nobody spoke as he passed. The study door hung open. A single candle still burned. Ashworth sprawled beside the desk. Blood darkened the Persian rug. Hale knelt and studied him. The dagger was nowhere visible. Yet the window was locked. Every door was bolted inside. Then the killer remained here. Hale turned toward the doorway. Six frightened faces stared back. One of them was lying.
created_at"2026-09-29T07:54:38.579Z" 9/29/2026, 7:54:38 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2826
moderation_latency(null)
generation_time9826
tokens_prompt46
tokens_completion327
native_tokens_prompt62
native_tokens_completion1169
native_tokens_completion_images(null)
native_tokens_reasoning950
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"
usage0.011814
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668478-lZKAKwsXVJkR7NAPfS1A"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668478-UzPegpRQvWCjmQKL41QL"
upstream_id"msg_011CfXNTayoqf6C64F3ynSxT"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNTayoqf6C64F3ynSxT"
is_byokfalse
latency605
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.011814
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
sentences19
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185