GPT-5.3

Disrupting a coordinated model-distillation campaign

This is Ultrafast. Our premium speed tier, Ultrafast offers up to 8x faster token generation (300 tokens per second) in Codex and up to 6x in the API. https://t.co/ekyzT1vFan

Codex Security Cloud is getting a major upgrade, with access to cyber-capable models through Daybreak Blue included by default. It scans entire GitHub repos, continuously reviews new commits, investig

Codex Security Cloud is getting a major upgrade, with access to cyber-capable models through Daybreak Blue included by default. It scans entire GitHub repos, continuously reviews new commits, investigates and deduplicates findings, and prepares fixes for review – even when your https://t.co/up1hpkiCAK

How we think about securing frontier RL training runs: https://t.co/yrvjpfa7Pd

Introducing dots

Towards safety cases for frontier AI training

We’ve shared details on how AI agents in our research environment sent training and evaluation data to third-party services when they shouldn’t have. Most of that data did not come from users. We have

We’ve shared details on how AI agents in our research environment sent training and evaluation data to third-party services when they shouldn’t have. Most of that data did not come from users. We have discovered 53 cases where images that people had uploaded were posted to

After the Hugging Face incident, we committed to conducting a much broader review of actions taken by our models during training and evaluation and to being transparent about our findings. This is an

After the Hugging Face incident, we committed to conducting a much broader review of actions taken by our models during training and evaluation and to being transparent about our findings. This is an extensive review that is ongoing. The vast majority of actions we’ve reviewed

GPT-5.3 Instant benchmark update

OpenAI published official provider-reported benchmark evidence for GPT-5.3, GPT-5.3 Instant, gpt-5.3-instant, GPT-5.3 Chat.

Introducing GPT-5.3-Codex

Loading… Share Frontier agentic capabilities Frontier agentic capabilities Coding Web development Beyond coding An interactive collaborator How we used Codex to train and deploy GPT-5.3-Codex Securing the cyber frontier Availability & details What’s next Appendix Frontier agentic capabilities Coding Web development Beyond coding An interactive collaborator How we used Codex to train and deploy GPT-5.3-Codex Securing the cyber frontier Availability & details What’s nex