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Run: 2026-03-18-01KM07HJAGAWTBG76PKW2YHD61
Run Details
Model:
GPT-5.4 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.1s
Cost:
$0.000182
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
0.75%
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
Messages
Meta
AI
The mansion’s veranda glimmered with dawn light as Inspector Hale arrived to greet the grieving assembly below. Inside, the air smelled of roses, wax, and fear, while servants kept whispering about last night’s argument. Mrs. Ellery insisted her husband slept peacefully, yet a carriage clock stopped precisely at midnight. Dr. Rowan examined the study carefully, noting no forced entry, no missing keys, and one overturned chair. Then a scream cut through silence, and every guest turned toward the library door, locked from within. Hale stepped forward, lifting the brass latch, and found Albert Ellery sprawled beside his desk, lifeless.
created_at
"2026-03-18T10:23:29.116Z"
3/18/2026, 10:23:29 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
454
moderation_latency
(null)
generation_time
1018
tokens_prompt
46
tokens_completion
168
native_tokens_prompt
41
native_tokens_completion
139
native_tokens_completion_images
0
native_tokens_reasoning
0
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
usage
0.00018195
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_05fc2205c4cab2ef0169ba7d212c0481979090615ef7c07503"
is_byok
false
latency
192
model_permaslug
"openai/gpt-5.4-nano-20260317"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer
(null)
api_type
"completions"
id
"gen-1773829409-VMwQ2zRyRSvFRG2TGItO"
upstream_id
"resp_05fc2205c4cab2ef0169ba7d212c0481979090615ef7c07503"
total_cost
0.00018195
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
0.75%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
17
1
17
2
15
3
17
4
17
5
16