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.
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View sourceGPT-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 source