Run: 2026-03-18-01KM0AV72YE8S8V4BQ8CE8C6PD

Run Details

Model:
GPT-5.4 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.3s
Cost:
$0.000141
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
46.93% 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
Night settled over Marrowgate Manor, where guests laughed softly while rain tapped stained glass above the dining hall. Sudden silence fell when Sir Alden Winters collapsed, clutching his chest, as candles flickered and shadows stretched across polished floors. Detective Leona Crowe arrived at dawn, noting the locked doors, the fragrant poison, and the startled servants’ trembling hands. The doctor pronounced him dead, then found a torn letter missing from Alden’s pocket, stained with fresh ink.
created_at"2026-03-18T11:21:11.018Z" 3/18/2026, 11:21:11 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency437
moderation_latency(null)
generation_time1163
tokens_prompt46
tokens_completion131
native_tokens_prompt41
native_tokens_completion106
native_tokens_completion_images0
native_tokens_reasoning0
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"
usage0.0001407
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_0f3133f47dbb4bcc0169ba8aa7138c81938a5dd2a4f19743a8"
is_byokfalse
latency178
model_permaslug"openai/gpt-5.4-nano-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-1773832871-hs51vtIfbIfeJPUha55S"
upstream_id"resp_0f3133f47dbb4bcc0169ba8aa7138c81938a5dd2a4f19743a8"
total_cost0.0001407
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
46.93% Matches word count n/a
neededCleanfalse
sentences4
wordCounts
018
120
219
318