Run: 2026-04-24-01KQ0NCQQQCYXF8NB7Y8E8XEKJ

Run Details

Duration:
13.9s
Cost:
$0.026125
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 hammered Blackthorn Manor as Inspector Vale arrived, finding every window lit and every servant whispering behind gloved hands nervously. In the library, Lord Ashcombe lay beneath the chandelier, a crimson letter opener buried deep in his throat, still gleaming. His daughter Eleanor stood beside the fireplace, dry-eyed, while her pearl necklace trembled against her black dress in candlelight nearby. The butler claimed the doors were locked, though muddy footprints crossed the Persian rug toward the terrace and vanished outside. Vale noticed a half-burned photograph curling in the grate, showing Ashcombe with a woman nobody named or dared remember aloud. Before anyone could speak, the grandfather clock struck midnight, and somewhere upstairs a young man screamed once, then fell silent. Vale closed the library door, pocketed the only key, and asked who had wished Lord Ashcombe dead so badly tonight.
created_at"2026-04-24T21:12:36.351Z" 4/24/2026, 9:12:36 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency12538
moderation_latency(null)
generation_time13627
tokens_prompt46
tokens_completion240
native_tokens_prompt41
native_tokens_completion864
native_tokens_completion_images0
native_tokens_reasoning682
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.026125
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_02d0d4254c4719890169ebdcc475fc8190b52c7092b8d79970"
is_byokfalse
latency297
model_permaslug"openai/gpt-5.5-20260423"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777065156-cOc3ph2O2gSNCoHe0bXu"
session_id(null)
api_type"completions"
id"gen-1777065156-A4Fg7o2iKxuFMRvvb7kX"
upstream_id"resp_02d0d4254c4719890169ebdcc475fc8190b52c7092b8d79970"
total_cost0.026125
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
020
120
220
320
420
520
620