OpenAI
Refined GPT-5 family release focused on chat quality, coding reliability, and better instruction-following in production use.
25.3
Quality Score
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Arena ELO
Undisclosed
Parameters
256K
Context
Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.
This model has normalized benchmark rows, so scores here are directly comparable across benchmark sources.
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Feb 2026
Released
These are recent benchmark or leaderboard claims from official provider sources. They are useful for freshness and context, but they are not treated the same as normalized independent benchmark rows.
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.
View sourceIntroducing GPT-5.3-Codex
Introducing GPT-5.3-Codex | OpenAI Skip to main content Research Products Business Developers Company Foundation (opens in a new window) Log in Try ChatGPT (opens in a new window) Research Products Business Developers Company Foundation (opens in a new window) Try ChatGPT (opens in a new window) Login OpenAI Table of contents Frontier agentic capabilities An interactive collaborator How we used Codex to train and deploy GPT-5.3-Codex Securing the cyber frontier Availability &
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