4.6K views · 22 likes · 1 reposts (at collection)
OpenAI extends prompt caching for the API, Codex, and Work
What happened
Baoyu relays @thsottiaux’s announcement that API caching now lasts 12h, while logged in Codex and Work users retain caches forever and are guaranteed cache hits when returning to old conversations or resuming after a few hours. Baoyu interprets the stated lack of a penalty as avoiding cache expiration charges and speculates that caches are saved to disk.
Why it matters
The update distinguishes API cache retention from logged in session retention, clarifying how returning to older conversations is treated across the two access paths.
Keep reading
Latest daily · Issue 28Mistral AI releases Voxtral 3 speech models and a voice agent SDKTrending now
- 1Mistral Releases Voxtral 3 Speech Models, Voice Agents API and LiveKit-Based SDK
- 2DeepSeek Open-Sources DeepInfer and API Components, With Model and Hardware Limits
- 3OpenAI Acquires Orchestra Bio to Expand AI Tools for Drug Development
- 4Google Rolls Out Gemini Personal Intelligence to Android Auto, With Google Built-In Cars to Follow
Tomorrow at 08:00, a briefing like this arrives in your inbox.
The same kind of briefing as the one above: a few stories worth reading. Free. Mail starts after you confirm, and every letter has a one-click unsubscribe. Read a past issue · 2026-10-21