Run: 2026-03-18-01KM0A3HP5G0QR4JASEMZ5K1QZ

Run Details

Model:
GPT-5.4 Nano (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
4.5s
Cost:
$0.000637
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
Detective Mara Quinn arrived at Silvermere Manor before sunrise today. The housekeeper whispered that Lord Edrin vanished during the gala. Footprints circled the fountain, ending abruptly near his study door. Inside, a single candle burned beside a broken champagne glass. Mara noticed fresh rain on stairs leading upward silently again. When she touched the seal, it crumbled like ash quietly. Servants watched nervously, each alibi rehearsed for the police already.
created_at"2026-03-18T11:08:15.44Z" 3/18/2026, 11:08:15 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4282
moderation_latency(null)
generation_time4400
tokens_prompt46
tokens_completion254
native_tokens_prompt41
native_tokens_completion503
native_tokens_completion_images0
native_tokens_reasoning397
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"
usage0.00063695
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_0fbeb604c6b253410169ba879f816c81978292ea12c2cf1565"
is_byokfalse
latency201
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-1773832095-kE9ZtnPJ6bA0aFamfRio"
upstream_id"resp_0fbeb604c6b253410169ba879f816c81978292ea12c2cf1565"
total_cost0.00063695
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
010
110
210
310
410
510
610