Project AURIONAI Use-Cases Research & Innovation
code

GPT-5.2-Codex

Upgraded version of GPT-5.2 optimised for agentic coding tasks in Codex or similar environments, with low to xhigh reasoning effort settings.

OpenAIOpenAIUSAGPT-5Family
OpenAI
Levelvariant
Classcode
Parametersnot in the notes
Context400,000
Releasednot in the notes
Opennessproprietary
Runs onnot in the notes
Statusactive

Lineage

successorfinetune
GPT-5.2 to GPT-5.4: successor, medium confidenceGPT-5.2 to GPT-5.2-Codex: finetune, medium confidenceGPT-5.2GPT-5.2OpenAIGPT-5.2-CodexGPT-5.2-CodexOpenAIGPT-5.4GPT-5.4OpenAI
OpenAIGPT-5.2 is the parent (finetune)medium confidencemodel card
Where this comes from
Parent and child relations from model cards, Hugging Face base_model fields and the genealogy tables of the research notes. The tree shows two generations each way, 3 models. Confidence and evidence are the notes' own.

R&D Topics

Agentic software engineeringproduced byCode language modelsproduced by

Identity

Developer
OpenAI
Family
GPT-5
Released
– sources
Weights published
–
Record checked
12 Oct 2026
Where this comes from
Developer and dates from the research notes. Release date is the vendor's public announcement; weights date is when open weights were published.

Architecture and Size

Architecture
not in the notes
Total parameters
– sources
Active parameters
–
Checkpoint parameters
–
Context length
400,000 tokens
Input
text, image
Output
text
Where this comes from
Parameter counts as the developer states them. Where the checkpoint holds a different total, both are shown (register A16).

Openness and Access

Openness
proprietary
Licence
Proprietary sources
Access routes
API
Where this comes from
The licence file governs over registry tags and aggregator labels.

Deployment

Runs on
not in the notes
Footprint
not in the notes
Runtimes
not in the notes
Where this comes from
Deployment tiers and runtimes as named in the notes. Footprint is the notes' figure, not a measurement by AURION.

Indonesia

Indonesian support
not stated
Regional languages
not in the notes
Jakarta hosting
unknown
Languages
not in the notes
Where this comes from
Indonesia fields are carried on every model; unknown is an allowed value.

Benchmark Results

The notes record no benchmark result for this model.

Industry Use Cases

No industry use case links this model.

Sources

  1. platform.openai.com/docs/models/gpt-5.2-codex https://platform.openai.com/docs/models/gpt-5.2-codex
  2. learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/m... https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure

To cite this page: Project AURION, AI Use-Cases Research & Innovation, "GPT-5.2-Codex", https://aurion.semai.id/models/openai-gpt-5-2-codex/, records of October 2026.