GPT-5.3

GPT-5.3 is a large language model first observed on February 26, 2026, catalogued under multiple concurrent aliases including GPT-5.2, GPT-5.4, Vortex, and Zenith. It achieves a GPQA score of 92.0 and an SWE-bench Pro score of 56.8, with pricing set at $1.75 per million input tokens and $14.00 per million output tokens. No official release notes, parent entity confirmation, or version lineage documentation accompanied its appearance, leaving its generation placement and relationship to prior or subsequent models unverified. The model series includes specialized variants such as GPT-5.3-Codex, its most capable agentic model for autonomous software development. GPT-5.3 matters now because its benchmark and pricing coordinates, fixed to a 2026-02-26 observation date, provide a verifiable reference point for evaluating cost-capability trade-offs, while its unresolved naming multiplicity presents a documented case for model identity tracking and procurement verification.

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