I love building with this model; it feels like more of a step forward than the benchmarks suggest.
Also you can choose "pragmatic" or "friendly" for its personality; people have strong preferences one way or the other!

GPT-5.3-Codex is here!
*Best coding performance (57% SWE-Bench Pro, 76% TerminalBench 2.0, 64% OSWorld).
*Mid-task steerability and live updates during tasks.
*Faster! Less than half the tokens of 5.2-Codex for same tasks, and >25% faster per token!
*Good computer use.

Sam Altman

Twitter

Monthly stablecoin volume reached $7.2 trillion in February 2026, surpassing the Automated Clearing House (ACH) network for the first time, which had $6.8 trillion.
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XRP 's 30-day liquidation index on Binance has fallen to a record low, near zero. Trading volume has plummeted from over $200 billion in January 2025 to virtually nothing.
The...

XRP liquidation drops on Binance – How will the price react?

It was amazing to watch how much faster we were able to ship 5.3-Codex by using 5.3-Codex, and fore sure this is a sign of things to come.