10,000 researchers gain free access to frontier models for research Quickly scan repositories and track security issues Safety review of Hugging Face incident to share learnings via technical report Opus 5 now available on all paid plans and API Control your computer and agents with voice commands Securely link health records to understand symptom changes and test results in context Deploy trusted enterprise agents right away 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 See how Anthropic judges risky model misuse Easily automate multi-step daily tasks at lower cost Make Claude easier to deploy through AWS Keep research tools and analysis in one place Delegate more everyday coding work to Claude 10,000 researchers gain free access to frontier models for research Quickly scan repositories and track security issues Safety review of Hugging Face incident to share learnings via technical report Opus 5 now available on all paid plans and API Control your computer and agents with voice commands Securely link health records to understand symptom changes and test results in context Deploy trusted enterprise agents right away 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 See how Anthropic judges risky model misuse Easily automate multi-step daily tasks at lower cost Make Claude easier to deploy through AWS Keep research tools and analysis in one place Delegate more everyday coding work to Claude

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AI BriefingOpenAIFeature Updates23:57

AI summarized from verified sources

Responses API with reasoning retention and compaction triples benchmark scores

API developers can efficiently boost model performance with Responses API and reasoning retention settings.

SOURCE CHECK

2 sources

VERIFIED

Sources

Primary / x.com

Official X

Supporting / openai.com

Official X

Key Points

1Responses API enables retained reasoning
2Context compaction improves token efficiency
3Demonstrated 188% ARC-AGI-3 score improvement

OpenAI applied the Responses API with retained reasoning and context compaction to the ARC-AGI-3 benchmark. GPT-5.6 Sol's score rose 188% while using 6x fewer output tokens. The standard harness discarded reasoning after each move and dropped earlier actions as context filled, forcing restarts. Developers can now adopt these settings to improve real-world performance.

What happened

OpenAI switched the ARC-AGI-3 harness to the Responses API and enabled retained reasoning plus context compaction. This led to a major score improvement for GPT-5.6 Sol.

Impact

API users adopting these settings can expect better performance on long-running agent tasks and reduced token usage. It also highlights that benchmark results depend heavily on settings.