Run: 2026-04-24-01KQ0MR5YTN4GBY6NKC6DQK7YA

Run Details

Duration:
16.5s
Cost:
$0.037165
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
At midnight, the grandfather clock stopped, and every guest in Blackthorn Hall turned toward the library doors in sudden silence. Behind them, rain hammered the windows, hiding the scrape of something heavy dragged across the marble floor outside the study. Inspector Vale arrived late, coat dripping, eyes fixed on the single bloody fingerprint staining the silver handle before anyone spoke. No one admitted hearing the shot, though Lord Blackthorn lay dead beside a pistol still warm on the carpet there. His daughter clutched a torn invitation, while the vicar whispered prayers that sounded suspiciously like apologies for old sins tonight. In the hearth, a charred letter curled inward, protecting one name from the flames as if alive and ashamed there. Vale noticed mud on the duchess's shoes, fresh grave soil, though she claimed never leaving dinner during the storm alone. Then the corpse's pocket watch chimed once, and someone hidden behind the curtains began to laugh very softly at last.
created_at"2026-04-24T21:01:22.792Z" 4/24/2026, 9:01:22 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency15233
moderation_latency(null)
generation_time16237
tokens_prompt46
tokens_completion550
native_tokens_prompt41
native_tokens_completion1232
native_tokens_completion_images0
native_tokens_reasoning1034
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"
usage0.037165
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0bcf7f663b0b0f5a0169ebda22e7b481958bcd148ec085d852"
is_byokfalse
latency258
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-1777064482-EyrQe68lZ0jHQvhQI8Py"
session_id(null)
api_type"completions"
id"gen-1777064482-CMxcIB7Ii25MXtxscq5H"
upstream_id"resp_0bcf7f663b0b0f5a0169ebda22e7b481958bcd148ec085d852"
total_cost0.037165
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
sentences8
wordCounts
020
120
220
320
420
520
620
720