Run: 2026-03-18-01KM0ASK1NVWRT0Z2NEB6R4680

Run Details

Duration:
10.6s
Cost:
$0.001016
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
85.59% 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, rain stitched the manor windows, and Detective Lark arrived to investigate a silent, crimson-scarred corpse in its study. The housekeeper whispered that Sir Alden never entertained strangers, yet the front door showed fresh bootmarks leading inward, then vanishing. Inside, lanternlight pooled around a shattered clock, stopped precisely when the alarm bell finally rang for the third floor study. Lark noted dried rosewater on the victim's cuffs, and a wax seal bearing unfamiliar initials underneath the overturned leather blotter. Suspects gathered in the corridor—maid, nephew, accountant—each reciting alibis with practiced, anxious smiles while stormwind worried tapestries and candles flickered. When Lark lifted the seal, a faint scent of smoke rose, implying someone burned documents nearby to erase last proof.
created_at"2026-03-18T11:20:17.729Z" 3/18/2026, 11:20:17 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency9993
moderation_latency(null)
generation_time10115
tokens_prompt46
tokens_completion715
native_tokens_prompt41
native_tokens_completion806
native_tokens_completion_images0
native_tokens_reasoning631
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.0010157
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_0e5a9418918446780169ba8a71c678819585c3022977e883b0"
is_byokfalse
latency169
model_permaslug"openai/gpt-5.4-nano-20260317"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer(null)
api_type"completions"
id"gen-1773832817-pIzHvchR4P8bYsKEhkJX"
upstream_id"resp_0e5a9418918446780169ba8a71c678819585c3022977e883b0"
total_cost0.0010157
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
85.59% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
020
120
220
320
422
520