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Run: 2026-03-18-01KM09DPH58J4T1NRATKD86DDB
Run Details
Model:
GPT-5.4 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.4s
Cost:
$0.000778
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
86.88%
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
Rain stitched the manor windows shut as twelve guests gathered beneath chandeliers, each pretending not to notice the bloodstained key. Inspector Vale arrived at midnight, carrying a telegram, a lantern, and the unsettling certainty that someone here had already vanished. In the library, a portrait of the late Mr. Ashcroft watched them all, its painted eyes fixed on the closed door. When the clock struck one, the housekeeper screamed, because the study door opened inward, revealing his body beside the extinguished fire. No one moved until Vale noticed the knife missing from the breakfast table, the one every guest had touched tonight. Outside, thunder rolled over the marshes, and inside, the guests began lying, one by one, with remarkable and terrible confidence.
created_at
"2026-03-18T10:56:19.507Z"
3/18/2026, 10:56:19 AM
model
"openai/gpt-5.4-mini-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
395
moderation_latency
(null)
generation_time
1324
tokens_prompt
46
tokens_completion
200
native_tokens_prompt
41
native_tokens_completion
166
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
0.00077775
router
(null)
provider_responses
0
endpoint_id
"9ee065b2-3d1c-43bc-bdd7-28af3b148282"
id
"resp_0fc22bed2edebfb50169ba84d38fe88190bda43d6e32c1e393"
is_byok
false
latency
172
model_permaslug
"openai/gpt-5.4-mini-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-1773831379-Mcxk3CU54iiWSW6ZtzQ9"
upstream_id
"resp_0fc22bed2edebfb50169ba84d38fe88190bda43d6e32c1e393"
total_cost
0.00077775
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
86.88%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
20
1
20
2
21
3
21
4
20
5
20