GPT-5.3 Codex
GPT-5.3 Codex is OpenAI's specialized coding model, offered through the OpenAI API alongside general-purpose GPT models. It's priced at $1.75 per million input tokens and $14.00 per million output tokens in standard mode, with a faster mode available at higher per-token rates.
Facts checked on against the sources listed at the end of this page.
- Pricing
- Pay as you goPaid from $1.75 per million input tokens (standard mode)
- Open source
- NoProprietary
A good fit for
- Developer tools and IDE integrations needing a coding-specialized model rather than a general-purpose chat model
- Teams wanting to choose between cost-optimized and low-latency modes depending on the task
- Projects already using OpenAI's API ecosystem that want a dedicated coding model option
Not a good fit for
- General-purpose conversational tasks, where OpenAI's flagship chat models are a better fit
- Budget-conscious projects with very high token volume, given the per-token cost relative to some competing coding models
- Users wanting a free tier for API-based access
GPT-5.3 Codex pricing
Standard mode costs $1.75 per million input tokens and $14.00 per million output tokens. Fast mode costs $3.50 per million input tokens and $28.00 per million output tokens, roughly double the standard rate in exchange for lower latency.
| Plan | Price | What you get |
|---|---|---|
| Standard mode | $1.75/M input, $14.00/M output | Cost-optimized coding model access. |
| Fast mode | $3.50/M input, $28.00/M output | Lower-latency responses at roughly double the standard per-token rate. |
Prices in USD, checked on 27 September 2026. Current prices on developers.openai.com.
Main features
- Specialized for coding
- Built and priced separately from OpenAI's general-purpose chat models, optimized for code tasks.
- Standard and fast modes
- A cost-optimized standard mode and a faster mode at a higher per-token rate.
- API access
- Available to developers through the OpenAI API for integration into coding tools.
About GPT-5.3 Codex
GPT-5.3 Codex is part of OpenAI's specialized model lineup, built specifically for code generation and software development tasks rather than general-purpose conversation, sitting alongside OpenAI's flagship chat models.
It's offered in a standard mode and a faster mode, trading off cost against latency: the faster mode costs roughly double the standard mode's per-token rate in exchange for quicker responses.
As a specialized coding model, it's commonly used by developer tools and IDE integrations that need strong code generation and understanding, distinct from OpenAI's broader chat-oriented GPT model family.
- Made by
- OpenAI
- Free plan
- No free tier for API access; usable through ChatGPT plans with usage limits
- Available on
- API, ChatGPT, Coding tools and IDE integrations
GPT-5.3 Codex alternatives
Questions about GPT-5.3 Codex
How much does GPT-5.3 Codex cost?
Standard mode is $1.75 per million input tokens and $14.00 per million output tokens; fast mode roughly doubles both rates for lower latency.
Is GPT-5.3 Codex the same as OpenAI's general chat models?
No, it's a specialized model built and priced separately for code generation and software development tasks.
What's the difference between standard and fast mode?
Fast mode costs about double the per-token rate in exchange for quicker response times.
Sources and links
Work on GPT-5.3 Codex? Claim this listing. Something wrong or out of date? Suggest a correction. Stats come from the public GitHub and npm APIs and update every day.