Codex App: inline LaTeX using `$...$` does not render in conversations or Markdown preview

What version of the Codex App are you using?

Observed on Windows with:

• App package: OpenAI.Codex_26.513.4821.0_x64__2p2nqsd0c76g0
• Codex App product version shown by the running process: 26.513.40821
• bundled codex.exe: 0.131.0-alpha.9

What platform is your computer?

Windows x64.

What issue are you seeing?

Inline LaTeX written with single-dollar delimiters does not render in the Codex App UI.

This appears in at least two places:

1. Assistant conversation output in the Codex App.
2. Markdown files opened/previewed inside the Codex App.

For example, this remains raw text instead of rendering as inline math:

$x+1=2$

However, the parenthesized LaTeX delimiter does render correctly:

\(x+1=2\)

Display math appears to render correctly in the same environment:

$$
\int_0^1 x^2\,dx = \frac{1}{3}
$$

and:

\[
\int_0^1 x^2\,dx = \frac{1}{3}
\]

Steps to reproduce

1. Open Codex App.
2. Ask the assistant to output the following Markdown:

Inline dollar: $x+1=2$
Inline parens: \(x+1=2\)

$$
\int_0^1 x^2\,dx = \frac{1}{3}
$$

1. Observe that \(x+1=2\) renders as inline math, while $x+1=2$ remains unrendered/raw.
2. Open or preview a Markdown file in Codex App containing $x+1=2$ and observe the same incompatibility.

Expected behavior

Codex App should either:

• render $...$ as inline math by default, matching common Markdown math behavior in tools such as ChatGPT, GitHub-flavored math Markdown, Typora, Obsidian, and many documentation workflows; or
• provide a compatibility setting to enable single-dollar inline math rendering.

Why this matters

Many existing Markdown notes, course materials, technical documents, and generated homework/report files use $...$ for inline math and $$...$$ for display math. Requiring \(...\) only for Codex App compatibility makes these documents less portable and creates friction when working with math-heavy projects.

The current workaround is to write inline math as \(...\), but that requires changing existing Markdown conventions or project instructions even though $...$ is widely used.

Related issues

• #10715 requested rendered LaTeX support in Codex App and was marked completed.
• #22821 reports a related but different block-math parsing issue with \[...\] after normal text.

This issue is specifically about single-dollar inline math $...$ not rendering in Codex App conversations and Markdown preview/opened files.