GPT-5.6 Sol API and credit pricing cut by over 20%Claude Security now scans GitHub repos with Mythos 5 Zero Data Retention continues with Private Safety Processing preview for stronger safety Claude can now send Gmail emails and manage Google Drive files Strengthen monitoring for high-risk training and pause RL runs Approved defenders can advance advanced vulnerability research with GPT-5.6-Cyber Cyclone forecasts now provide over a day of extra lead time Talk while reasoning or using tools without conversation breaks AI delivers new results on 10 long-standing math problems with proofs released GPT-5.6 Luna and Terra prices drop 80% and 20%, with faster Sol option added Opus 5 now available on all paid plans and API Securely link health records to understand symptom changes and test results in context Run code inside notes for deeper analysis GPT-Red boosts prompt injection resistance significantly Cut lesson prep time with AI You can move from conversation to documents faster Run AI inference in the browser and cut wait time Review how you use Claude and cut waste Long tasks can move from draft to presentation more easily Track the latest safety rules for bigger models GPT-5.6 Sol API and credit pricing cut by over 20%Claude Security now scans GitHub repos with Mythos 5 Zero Data Retention continues with Private Safety Processing preview for stronger safety Claude can now send Gmail emails and manage Google Drive files Strengthen monitoring for high-risk training and pause RL runs Approved defenders can advance advanced vulnerability research with GPT-5.6-Cyber Cyclone forecasts now provide over a day of extra lead time Talk while reasoning or using tools without conversation breaks AI delivers new results on 10 long-standing math problems with proofs released GPT-5.6 Luna and Terra prices drop 80% and 20%, with faster Sol option added Opus 5 now available on all paid plans and API Securely link health records to understand symptom changes and test results in context Run code inside notes for deeper analysis GPT-Red boosts prompt injection resistance significantly Cut lesson prep time with AI You can move from conversation to documents faster Run AI inference in the browser and cut wait time Review how you use Claude and cut waste Long tasks can move from draft to presentation more easily Track the latest safety rules for bigger models

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OpenAI Updates Guide on Optimizing Prompt Caching

Acceleration and cost savings become easier when reusing repeated instructions in API calls.

SOURCE CHECK

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Sources

Primary / platform.openai.com

Official Docs

Key Points

1Prefix matching is key to effective caching
2Automatically enabled for prompts over 1024 tokens
3Place fixed instructions upfront, variable info at the end

OpenAI has updated its guide explaining the mechanics and best practices for Prompt caching, which reuses common prompt prefixes to speed up responses. Placing fixed instructions at the start and variable content at the end improves cache hit rates. This quick optimization lowers latency and cost in apps that repeatedly use the same initial prompts.

Key point

OpenAI has updated its guide explaining the mechanics and best practices for Prompt caching, which reuses common prompt prefixes to speed up responses. Placing fixed instructions at the start and variable content at the end improves cache hit rates. This quick optimization lowers latency and cost in apps that repeatedly use the same initial prompts.

Impact

Acceleration and cost savings become easier when reusing repeated instructions in API calls. Key checks: Prefix matching is key to effective caching / Automatically enabled for prompts over 1024 tokens / Place fixed instructions upfront, variable info at the end.