# GPT-5.3-Codex-Spark

GPT-5.3-Codex-Spark is an AI model released by OpenAI on Feb 12 2026. It has a 128k context window.

## Facts

| Field | Value |
| --- | --- |
| Model | GPT-5.3-Codex-Spark |
| Developer | OpenAI |
| Release date | Thursday, Feb 12 2026 |
| Licensing | Closed |
| Context window | 128k |

## Questions and answers

### When was GPT-5.3-Codex-Spark released?

GPT-5.3-Codex-Spark was released by OpenAI on Thursday, Feb 12 2026.

### Who made GPT-5.3-Codex-Spark?

GPT-5.3-Codex-Spark was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.

### What is the context window of GPT-5.3-Codex-Spark?

GPT-5.3-Codex-Spark has a context window of 128k. That is the maximum amount of input plus output the model can hold in a single request.

### Is GPT-5.3-Codex-Spark open source?

No. GPT-5.3-Codex-Spark is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after GPT-5.3-Codex-Spark?

OpenAI's previous tracked release was GPT-5.3-Codex on Feb 5 2026, 7 days earlier. It was followed by GPT-5.4 on Mar 5 2026.


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Canonical page: https://aireleasetracker.com/model/openai/gpt-5.3-codex-spark
Site index: https://aireleasetracker.com/llms.txt
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.