GPT-5.3-Codex
READER SUMMARYA broadly capable long-running computer-work agent with High cyber classification and layered access safeguards.
Why this model scores 84.4
Strong coding, research, tool use, computer use, and professional-work breadth support high capability and autonomy; initial paid distribution and layered cyber safeguards temper deployment and control difficulty.
News tied to GPT-5.3-Codex
The model score of 84.4 rates this model's risk profile. The overall Doom Index of 62.1 measures the recalibrated complete evidence corpus. These values answer different questions.
Each article's leave-one-out Doom Index contribution is divided equally among the exact models named on that article. This prevents multi-model evidence from being claimed in full on several model pages. Model risk scores are recalculated from their technical profile and related news, but never feed back into the overall index.
OpenAI releases GPT-5.3-Codex with high cyber classification
OpenAI released GPT-5.3-Codex for long-running computer work after using early versions in its own training and deployment process, while treating it as High cyber capability.
- Full item contribution
- +0.13
- GPT-5.3-Codex equal share
- +0.13
Model score history
- R2Doom Score 84.4
Full-corpus evidence recalculated after run intensive-backfill-20260811-191225 under bounded-corpus-v2.
11 Aug 2026 - R1Doom Score 85.6
New source-verified exact model absent from durable context.
11 Aug 2026