Run: 2026-04-24-01KQ0NYA4XS5ED3K0EPBP0Y5QS

Run Details

Model:
GPT-5.5
Duration:
4.4s
Cost:
$0.003775
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
17.99% 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 stitched silver threads across Blackmoor Station as Inspector Vale stepped from the train into fog smelling of coal. At midnight, the manor’s windows glowed ahead, though Lord Ashbury’s telegram had requested help tomorrow, not tonight. The butler met him by the gates, pale, gloved hands trembling around a lantern with cracked yellow glass. “Inspector,” he whispered, “forgive the hour, but someone has murdered Lady Ashbury inside the locked music room.” From the house came one piano note, soft and deliberate, though every servant stood waiting outside in terror.
created_at"2026-04-24T21:22:12.261Z" 4/24/2026, 9:22:12 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency615
moderation_latency(null)
generation_time4287
tokens_prompt46
tokens_completion155
native_tokens_prompt41
native_tokens_completion119
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"
usage0.003775
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_04d0e0f9337335e20169ebdf0460e081948f9db8c7665d36a9"
is_byokfalse
latency285
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-1777065732-o8L62Mv7GlZ7cGuXysG7"
session_id(null)
api_type"completions"
id"gen-1777065732-lnT98ZHFtHFIfScPE2XH"
upstream_id"resp_04d0e0f9337335e20169ebdf0460e081948f9db8c7665d36a9"
total_cost0.003775
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
17.99% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
019
117
218
317
418