Run: 2026-04-24-01KQ0P59S2APD7EX8K9BD58VJJ

Run Details

Duration:
19.4s
Cost:
$0.038665
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

AI
Rain worried the windows of Blackthorn Manor while seven guests waited for midnight and pretended not to hear thunder outside. In the library, candles trembled beside portraits whose painted eyes seemed freshly accused by every violent flash of lightning outside. Detective Mara Vale arrived late, her coat dripping dark water onto the tiles like evidence refusing to dry before morning. Lord Ashcombe's chair stood empty at the head of dinner, though his wineglass still held a single ruby mouthful untouched. No one mentioned the locked study upstairs, or the bell that had rung twice after servants withdrew for the night. Mara noticed mud on the Persian carpet, shaped by a boot too large for any lady present in the room. Sir Julian laughed first, too loudly, and asked whether detectives usually counted footprints before greeting their hosts at dinner parties. Before Mara answered, a scream unfurled above them, long and silver, from behind the study door on the landing overhead. They found Lord Ashcombe seated at his desk, smiling faintly, with an ivory letter opener in his throat before dawn. On the blotter, in drying ink, he had written only one word: forgive, underlined with blood and an unmistakable flourish.
created_at"2026-04-24T21:26:01.259Z" 4/24/2026, 9:26:01 PM
model"openai/gpt-5.5-20260423"
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external_user(null)
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latency17984
moderation_latency(null)
generation_time18720
tokens_prompt46
tokens_completion831
native_tokens_prompt41
native_tokens_completion1282
native_tokens_completion_images0
native_tokens_reasoning1034
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
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origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.038665
router(null)
provider_responses
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endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
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is_byokfalse
latency248
model_permaslug"openai/gpt-5.5-20260423"
provider_name"OpenAI"
status200
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request_id"req-1777065961-aylOybD8OH7vH7mB2IDK"
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api_type"completions"
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total_cost0.038665
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
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Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
020
120
220
320
420
520
620
720
820
920