Run: 2026-03-18-01KM09B4C6ERB7KF5M2GVVK1HN

Run Details

Model:
GPT-5.4 Mini (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
6.9s
Cost:
$0.001786
Provider:
OpenAI

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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain stitched the town square as midnight bells began tolling. Inspector Vale arrived, coat soaked, eyes fixed on the fountain. Something pale floated beside it, turning the black water silver. A scream had ended earlier, leaving only whispers and footprints. Vale noticed three sets, though the body lay untouched nearby. Someone was lying, and everyone in town practiced the habit.
created_at"2026-03-18T10:54:55.38Z" 3/18/2026, 10:54:55 AM
model"openai/gpt-5.4-mini-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency6531
moderation_latency(null)
generation_time6652
tokens_prompt46
tokens_completion387
native_tokens_prompt41
native_tokens_completion390
native_tokens_completion_images0
native_tokens_reasoning306
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.00178575
router(null)
provider_responses
0
endpoint_id"9ee065b2-3d1c-43bc-bdd7-28af3b148282"
id"resp_097a6972ff3adf3f0169ba847f6eb88193acc19c040b9b8238"
is_byokfalse
latency183
model_permaslug"openai/gpt-5.4-mini-20260317"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer(null)
api_type"completions"
id"gen-1773831295-jq8dDqOs3Ue5mIglAn2B"
upstream_id"resp_097a6972ff3adf3f0169ba847f6eb88193acc19c040b9b8238"
total_cost0.00178575
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
010
110
210
310
410
510