AI Tool WatchCan ChatGPT Write and Edit Code?
Yes — available on the free plan
Canvas
Canvas is **being sunset**. OpenAI removed the split-screen Canvas interface from its GPT-5.5 flagship models (Instant and Thinking), replacing it with inline **writing blocks and code blocks** in the chat thread. Canvas **remains available by default in GPT-4o for all users including free**, and paid users can still reach it through legacy models—but that legacy path **ends when OpenAI o3 retires on August 26, 2026**.
| Plan | Available | Notes |
|---|---|---|
| Free | ✓ | |
| Go | ✓ | |
| Plus | ✓ | |
| Pro | ✓ | |
| Business | ✓ | |
| Enterprise | ✓ |
Available on: Windows macOS web
Verified: 2026-08-15
Sources: https://openai.com/index/introducing-canvas/, https://help.openai.com/en/articles/9624314-model-release-notes
Codex (Code Agent)
Codex is ChatGPT's coding agent that can write, run, and debug code autonomously. **Available on every plan including Free**, but usage is quota-gated—Free and Go get limited runs, while **Plus ($20/mo) and above** get the usable allowances. Available via **web, desktop apps, and CLI** (`npm i -g @openai/codex`) on macOS, Linux, and Windows (WSL).
| Plan | Available | Notes |
|---|---|---|
| Free | ✓ | |
| Go | ✓ | |
| Plus | ✓ | |
| Pro | ✓ | |
| Business | ✓ | |
| Enterprise | ✓ |
Available on: Windows macOS Linux iOS Android web terminal API
Verified: 2026-08-15
Sources: https://chatgpt.com/pricing, https://github.com/openai/codex, https://developers.openai.com/codex/cli/
Codex Security
Codex Security is OpenAI's AI security agent—it connects to your GitHub repos, builds a codebase-specific threat model, validates vulnerabilities in sandboxed environments, and generates fix PRs. **Requires Pro ($200/mo), Enterprise, Business, or Edu**—not available on Plus or lower. Launched March 6, 2026 as a research preview with free usage for the first month.
| Plan | Available | Notes |
|---|---|---|
| Free | ✗ | |
| Go | ✗ | |
| Plus | ✗ | |
| Pro | ✓ | |
| Business | ✓ | |
| Enterprise | ✓ | |
| Edu | ✓ |
Available on: Windows macOS web
Verified: 2026-08-15
Sources: https://openai.com/index/codex-security-now-in-research-preview/, https://help.openai.com/en/articles/20001107-codex-security
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