Run: 2026-03-18-01KM0AA76PAZ8A6SDCZPSTZJ86

Run Details

Model:
GPT-5.4 Nano (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
3.7s
Cost:
$0.000592
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 tapped windows as Detective Mara arrived at Silverton Manor. Inside, guests whispered, pretending they hadn't heard the scream earlier. The butler guided her past velvet curtains to the library. A body lay sprawled beside scorched books, face turned downward. On the desk, a broken pocketwatch still ticked ominously softly. Mara noted ink stains and a missing letter opener nearby.
created_at"2026-03-18T11:11:54.082Z" 3/18/2026, 11:11:54 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3298
moderation_latency(null)
generation_time3627
tokens_prompt46
tokens_completion103
native_tokens_prompt41
native_tokens_completion467
native_tokens_completion_images0
native_tokens_reasoning378
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"
usage0.00059195
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_097efa306921d6eb0169ba887a22bc819586fc61d28561ae3a"
is_byokfalse
latency286
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-1773832314-2pzoHjxabjnViYFhDE7r"
upstream_id"resp_097efa306921d6eb0169ba887a22bc819586fc61d28561ae3a"
total_cost0.00059195
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