AI model
OpenAI's GPT-5.3-Codex, a closed agentic coding model released in early 2026 for Codex and the API; its model ID is scheduled for API removal on April 1, 2027.
OpenAI will remove gpt-5.3-codex, gpt-5.1 and gpt-5.4-nano from its API on April 1, 2027, according to a dev.to migration guide. The guide treats that date as the end of a staged move that starts by finding every caller, including the ones grep cannot see.
Reality
The lab says Claude leads 26% of its model research and collaborates on about 90%, with both tiers defined by how closely a human directs each task, and it wants rival labs publishing the same measure.
Perspective Coverage
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Auto-review, shipped in Codex last week, hands escalation requests at the sandbox boundary to a separate GPT-5.4 Thinking call that approves about 99 percent of them and cuts human stops roughly 200-fold.
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California's transparency law makes a developer's own safety policy enforceable against it, and the Midas Project built its case entirely from OpenAI's Frontier Governance Framework and the system cards published after it.
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Deterministic checkers replaced the judge model, and the project instruction file finished below having no instruction file at all. The measurable part of context engineering turns out to be narrow.
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Z.ai says its 743B-parameter GLM-5.3 hits 34.5% on its own code bench using 22% fewer output tokens than GLM-5.2. The weights are still two weeks out.
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