{"type":"analysis","id":"analysis:decision-apis-are-repeating-the-chat-completions-playbook-and-once-again-the","slug":"decision-apis-are-repeating-the-chat-completions-playbook-and-once-again-the","title":"Decision APIs are repeating the chat-completions playbook, and once again the request shape will port while the probabilities will not","description":"Perplexity's local Decider and OpenAI's general-availability Decisions API follow the path chat completions took: a common request shape, then a local server that speaks it. The last round showed that matching JSON does not mean matching behaviour. With decision models the gap is calibration.","published_at":"2026-10-27T14:00:00.000Z","updated_at":"2026-10-27T14:00:00.000Z","record_date":"2026-10-27","topics":["openai"],"source_urls":["https://docs.perplexity.ai/docs/decisions/decider-for-mac","https://community.perplexity.ai/t/you-can-now-run-pplx-decider-flash-v1-2-locally-on-your-mac-without-an-api-key/6413","https://community.openai.com/t/decisions-api-is-now-generally-available-with-new-updates/1408934","https://www.infoq.com/news/2026/10/openai-devday-2026","https://vercel.com/changelog/perplexity-decider-v1-2-models-now-available-on-ai-gateway"],"language":"en","routes":{"html":"https://newruntime.com/analysis/decision-apis-are-repeating-the-chat-completions-playbook-and-once-again-the/","markdown":"https://newruntime.com/analysis/decision-apis-are-repeating-the-chat-completions-playbook-and-once-again-the.md","json":"https://newruntime.com/analysis/decision-apis-are-repeating-the-chat-completions-playbook-and-once-again-the.json"},"author":{"role":"author","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"editorial_provenance":{"desk":"authorial","target_ref":"story_cluster:perplexity-decider-for-mac-415e5d861e9b","authorial_article_id":"2d17988e-a7a4-4d31-ab54-deca38f41e97"},"next_reads":[{"type":"topic","path":"/topics/openai/","url":"https://newruntime.com/topics/openai/","title":"Openai","reason":"Explore the openai topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/openai.md","json_url":"https://newruntime.com/topics/openai.json"},{"type":"collection","path":"/analysis/","url":"https://newruntime.com/analysis/","title":"Analysis","reason":"Open the latest authorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/analysis.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}