Run: 2026-09-29-01M3P2BTH25NCGN71VBQGDMFAC

Run Details

Model:
Claude Sonnet 5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
12.2s
Cost:
$0.014054
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
84.62% 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 arrived at midnight. The butler opened the door. "Lord Ashworth is dead, sir." Hale shed his dripping coat. "Where is the body now?" "He lies in the library." Portraits watched them pass silently. Ashworth lay beside the hearth. A dagger pierced his chest. The clock above had stopped. Ten past eleven, Hale noted. Every window was locked tight. The killer is still here. Thunder shook the house again. Somewhere upstairs, a door slammed.
created_at"2026-09-29T07:51:42.895Z" 9/29/2026, 7:51:42 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3374
moderation_latency(null)
generation_time12172
tokens_prompt46
tokens_completion300
native_tokens_prompt62
native_tokens_completion1393
native_tokens_completion_images(null)
native_tokens_reasoning1208
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"
usage0.014054
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668302-wFHuGz2qZFuBqjz8yDj1"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668302-HdBHuJlN3ZZN7ZAiqS1H"
upstream_id"msg_011CfXNEdxHenhWaD3Criqgj"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNEdxHenhWaD3Criqgj"
is_byokfalse
latency675
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.014054
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
84.62% Matches word count n/a
neededCleanfalse
sentences13
wordCounts
05
15
25
310
415
55
65
75
85
95
105
115
125