You can get very close results to GPT 5. 5 by using GPT 5. 4 with a highly detailed prompt .
Source: [Dev.to](https://dev.to/tomerbendavid/codex-54-vs-55-pricing-and-quality-3a1n)
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A new layer is consolidating in the agent stack, and it has a name now: pre-action authorization. The idea is clean. Before an agent executes a tool call, a deterministic policy engine intercepts it, checks it against declarative rules, and signs an audit record.
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