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Run: 2026-03-09-01KKAC8P9GGMZHF7WN1KBNCCXT
Run Details
Model:
GPT-5.4 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
15.9s
Cost:
$0.016287
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain worried the windows of Blackthorn Hall as guests arrived dripping, unaware the evening would end with one chair empty. At precisely eight, Lady Vale welcomed them smiling, her pearls luminous against mourning silk, while thunder rehearsed beyond the cliffs. Detective Elias Ward attended reluctantly, summoned for dinner not duty, yet noting every handshake, hesitation, and glance toward locked doors. The host, Professor Bell, raised a crystal glass to absent friends, though his gaze lingered longest on the returned widow. Candles bent in sudden drafts, silver chimed softly, and somewhere above them a floorboard creaked like a cautious confession overhead. When the lamps failed, darkness entered eagerly, and a single gunshot cracked the room apart like splitting winter ice cleanly. Light returned to reveal Professor Bell collapsed beside the fireplace, his glass shattered, his shirtfront blossoming with impossible red blood. Nobody moved until Ward stooped beside the body, then looked up grimly, certain everyone present had already begun lying beautifully.
created_at
"2026-03-09T22:42:43.641Z"
3/9/2026, 10:42:43 PM
model
"openai/gpt-5.4-20260305"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
14394
moderation_latency
(null)
generation_time
15788
tokens_prompt
46
tokens_completion
554
native_tokens_prompt
41
native_tokens_completion
1079
native_tokens_completion_images
0
native_tokens_reasoning
865
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
0.0162875
router
(null)
provider_responses
0
endpoint_id
"9ff5625c-403f-4d7f-b895-58ac7295062c"
id
"resp_0c3c927724be735b0169af4ce3b7088194a3588beb06a0923c"
is_byok
false
latency
223
model_permaslug
"openai/gpt-5.4-20260305"
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-1773096163-jOYnxe5j4gPuePz9Jwk7"
upstream_id
"resp_0c3c927724be735b0169af4ce3b7088194a3588beb06a0923c"
total_cost
0.0162875
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20