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GPT-5.3-Codex

GPT-5.3-Codex
DeveloperOpenAI
ReleaseFebruary 5, 2026; 6 months ago (2026-02-05)
Type
LicenseProprietary
Websiteopenai.com/index/introducing-gpt-5-3-codex/

GPT-5.3-Codex (Generative Pre-trained Transformer 5.3 Codex) is a large language model (LLM) announced and released by OpenAI on February 5, 2026.[1]

It is made as a competitor to Claude's Opus 4.6, focusing on code generation, speed and the ability to search repositories, run terminal commands and at the same time, debug code.[citation needed] In technical benchmarks, it is reported that GPT-5.3 Codex is 25% faster than Opus 4.6.[2]

GPT-5.3 Codex is available in the Codex app and on the web; access via API is also planned.[3]

According to OpenAI, GPT-5.3-Codex is the company's "first model that was instrumental in creating itself."[4][5]

On February 12, 2026, GPT-5.3-Codex-Spark was released in a research preview, which is a smaller version of GPT-5.3-Codex which supports text-only input. As of February 2026, GPT-5.3-Codex is only available for ChatGPT Pro ($200/month) subscribers.[6]

References

  1. ^ Axon, Samuel (February 5, 2026). "With GPT-5.3-Codex, OpenAI pitches Codex for more than just writing code". Ars Technica. Retrieved April 3, 2026.
  2. ^ "GPT-5.3 Codex: From Coding Assistant to General Work Agent". www.datacamp.com. Retrieved March 27, 2026.
  3. ^ "OpenAI's new GPT-5.3-Codex is 25% faster and goes way beyond coding now - what's new". ZDNET. Retrieved April 3, 2026.
  4. ^ Werth, Timothy Beck (February 5, 2026). "OpenAI: New coding model GPT-5.3-Codex helped build itself". Mashable. Retrieved April 3, 2026.
  5. ^ Peckham, James; Albanesius, Chloe (February 6, 2026). "OpenAI's Newest GPT Model Helped to Build Itself". PCMag. Retrieved April 8, 2026.
  6. ^ Viswanathan, Pradeep (February 12, 2026). "OpenAI introduces GPT‑5.3‑Codex‑Spark, an ultra-fast coding model powered by Cerebras". Neowin. Retrieved April 8, 2026.
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