GPT-5.3 Codex is OpenAI's flagship coding model. It leads Terminal-Bench by a wide margin and performs on par with Opus 4.6 on our internal benchmarks, at roughly one-third the price. Much faster than previous GPT generations. A strong default for most coding tasks.

## Strengths

- Leads Terminal-Bench by a wide margin. Competitive with Opus 4.6 on our internal benchmarks.
- About one-third the price of Opus with comparable quality on most tasks. Good for daily coding, long debugging sessions, and cost-conscious teams.
- Grinds through complex, multi-step problems and deep debugging sessions.

## Limitations

- Code style is less polished than Opus on architecture-heavy tasks.
- Terminal-Bench skews toward general reasoning; real-world coding gains may differ.

## Tools

GPT-5.3 Codex has access to all agent tools when used with Cursor including:

Learn more about [how tools work](https://cursor.com/docs/agent/overview.md#tools) and [tool calling fundamentals](https://cursor.com/learn/tool-calling.md).

## Pricing

Cursor [plans](https://cursor.com/docs/models-and-pricing.md) include two usage pools. GPT-5.3 Codex draws from the **API** pool, which charges at the rates below. Individual plans include at least $20 of API usage each month (more on higher tiers). All prices are per million tokens.

A high reasoning effort variant (`gpt-5.3-codex-high`) is available for tasks that need deeper analysis.


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## Sitemap

[Overview of all docs pages](/llms.txt)