Run: 2026-03-18-01KM09A58864J18MAJ9A03A061

Run Details

Model:
GPT-5.4 Nano (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
2.8s
Cost:
$0.000644
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Harbor fog hid everything tonight. Body surfaced near pier tonight. Detective Mara found bloodied footprints. Led past silent warehouse doors. Lena Walsh watched officers work. Mara asked about missing watch. The timepiece stopped at midnight. Outside, gulls screamed like witnesses. Chief Varron called it careless. Mara sensed something darker brewing.
created_at"2026-03-18T10:54:23.51Z" 3/18/2026, 10:54:23 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2557
moderation_latency(null)
generation_time2692
tokens_prompt46
tokens_completion100
native_tokens_prompt41
native_tokens_completion509
native_tokens_completion_images0
native_tokens_reasoning423
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"
usage0.00064445
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_04e5f4dd9a9c8d5b0169ba845f91b48193aa61c6d9276f277b"
is_byokfalse
latency200
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-1773831263-5Il1IDO2JZZeQAywbtRT"
upstream_id"resp_04e5f4dd9a9c8d5b0169ba845f91b48193aa61c6d9276f277b"
total_cost0.00064445
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
05
15
25
35
45
55
65
75
85
95