Run: 2026-04-24-01KQ0P3TJE6CE5KXB17VE19K9D

Run Details

Model:
GPT-5.5
Duration:
5.7s
Cost:
$0.004285
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
41.58% 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 Hall while Inspector Vale counted thirteen guests reflected in the dining room mirrors tonight. At midnight, the grandfather clock stopped, and Lady Marrow screamed from the library with astonishing theatrical precision for everyone. We found Lord Marrow beneath the atlas table, his white gloves soaked crimson, one finger pointing toward nothing. No one touched the body, except the wind, which entered through broken glass and fluttered accusation across his papers. Then the lights returned, revealing a silver chess knight clutched tightly in the dead man’s left hand. Someone whispered that dinner had hidden sharper knives, and every face suddenly remembered a private reason for silence.
created_at"2026-04-24T21:25:12.92Z" 4/24/2026, 9:25:12 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency830
moderation_latency(null)
generation_time5651
tokens_prompt46
tokens_completion193
native_tokens_prompt41
native_tokens_completion136
native_tokens_completion_images0
native_tokens_reasoning0
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"
usage0.004285
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0877ec0e3b91473e0169ebdfb93c748195a35f70e4bf80a33b"
is_byokfalse
latency486
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-1777065912-dOmniXVLeJDwVCeUXKo1"
session_id(null)
api_type"completions"
id"gen-1777065912-GTBUjcx9Mc6mxmLf3uo5"
upstream_id"resp_0877ec0e3b91473e0169ebdfb93c748195a35f70e4bf80a33b"
total_cost0.004285
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
41.58% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
020
119
218
319
417
518