LLM WORLD

GPT-5.3-Codex

OpenAI · · 56 days after GPT-5.2

Partially verified

1 of 2 published values traced to a source1 primary source, 2 archived1 not disclosed by the lab1 not researched yet

Why this status

Cited to official documentation. Not verified because the release date and the context window could not be found in any cited primary source — the value may be correct, but this dataset cannot yet show where it came from. Modalities read from OpenAI's own model documentation, which states: “Modalities Text Input and output Image Input only Audio Not supported Video Not supported.” The snapshot cited was moved from 2026-02-16 to 2026-02-26: the earlier capture caught only the page shell before its content rendered, so it evidenced nothing it was cited for. Capabilities evidenced from the primary sources: vision: “Modalities Text Input and output Image Input only Audio Not supported Video Not supported”.

What these states mean · How records are judged · Has this record changed?

A coding-specialised model able to search repositories, run terminal commands and debug, positioned against Claude Opus 4.6.

agenticvisionmultimodallong-context

Details

ReleasedFebruary 5, 2026
CompanyOpenAI
FamilyGPT
EraAgentic systems
TypeLanguage model · LLM
ModalitiesText + Image → Text
CapabilitiesAgentic, Vision
WeightsProprietary
LicenceNot applicable — proprietary
Context window400K tokens
stated in developers.openai.com

GPT-5.3-Codex supports a context window of 400,000 tokens.

ParametersNot disclosed

Pricing

The price a lab's own page showed on the day that page was captured. That is what a snapshot can prove; it is not necessarily the launch price, and prices are often cut later. Citing the live pricing page instead would give a number with no date at all.

Input $1.75 per million tokens observed February 26, 2026 · archived snapshot (2026-02-26)
Output $14 per million tokens observed February 26, 2026 · archived snapshot (2026-02-26)

Current information, elsewhere

This record is a historical one: every figure above is traced to a dated primary source. For what is true today — live pricing, current rankings, availability — these are better maintained than anything here could be.

Sources

Record status: partly verified · confidence 60/100 · 1 of 2 primary

Cited to official documentation. Not verified because the release date and the context window could not be found in any cited primary source — the value may be correct, but this dataset cannot yet show where it came from. Modalities read from OpenAI's own model documentation, which states: “Modalities Text Input and output Image Input only Audio Not supported Video Not supported.” The snapshot cited was moved from 2026-02-16 to 2026-02-26: the earlier capture caught only the page shell before its content rendered, so it evidenced nothing it was cited for. Capabilities evidenced from the primary sources: vision: “Modalities Text Input and output Image Input only Audio Not supported Video Not supported”.

Primary means published by the organisation that made the model. Verified records require at least one.

GPT family

  1. GPT-4 March 14, 2023
  2. GPT-4o May 13, 2024
  3. GPT-4.5 February 27, 2025
  4. GPT-5 August 7, 2025
  5. GPT-5.1 November 12, 2025
  6. GPT-5.2 December 11, 2025
  7. GPT-5.3-Codex February 5, 2026
  8. GPT-5.4 March 5, 2026
  9. GPT-5.5 April 23, 2026
  10. GPT-5.6 Sol July 9, 2026
  11. GPT-5.6 Luna July 9, 2026
  12. GPT-5.6 Terra July 9, 2026
  13. GPT-5.6-Cyber August 10, 2026
  14. GPT-6 Astra September 3, 2026
  15. GPT-Rosalind September 8, 2026
  16. GPT-6 Sol September 22, 2026
  17. GPT-6 Luna September 22, 2026
  18. GPT-6.1 Sol September 29, 2026

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