Run: 2026-04-24-01KQ0NWJAQB1N9Y3G3W15TQH6S

Run Details

Model:
GPT-5.5
Duration:
4.5s
Cost:
$0.003865
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
41.81% 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 lines across Blackthorn Hall’s windows as Inspector Vale arrived, finding the butler dead beneath the chandelier’s trembling crystals. The household gathered silently, each face pale with secrets, while the grandfather clock struck midnight thirteen times without explanation. On the marble floor, a crimson playing card rested near the body, bearing Lady Blackthorn’s missing sapphire brooch. Vale removed his gloves, studied the impossible scene, and noticed wet footprints leading upward toward the locked nursery door. Behind that door, a child’s music box began playing softly, though every servant swore the room stood empty.
created_at"2026-04-24T21:21:15.104Z" 4/24/2026, 9:21:15 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency643
moderation_latency(null)
generation_time4399
tokens_prompt46
tokens_completion169
native_tokens_prompt41
native_tokens_completion122
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"
usage0.003865
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_024ecb47a8abf4da0169ebdecb313c81938daaadbaded0f694"
is_byokfalse
latency261
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-1777065675-bV4evUUlPS80kg6orLe2"
session_id(null)
api_type"completions"
id"gen-1777065675-4SMOCBuHdh4wV0rTBMUC"
upstream_id"resp_024ecb47a8abf4da0169ebdecb313c81938daaadbaded0f694"
total_cost0.003865
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
41.81% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
021
119
218
319
418