GPT-5.3 Codex
Optional online serviceOpenAI · Feb 2026
OpenAI's dedicated agentic coding model - state-of-the-art software engineering.
- Context
- 391K tokens
- Input
- $2.27/M
- Output
- $18/M
- Vision
- Text only
Pricing
| Input / M tokens | Output / M tokens | Cached input / M | Per-request fee |
|---|---|---|---|
| $2.27 | $18 | $0.23 | None |
An optional paid service: sign in with your Flowsta Identity to use it. Billed by actual tokens used, against your allowance and metered rates - the app shows the cost of every conversation as you go.
What would a month cost?
An optional paid service, billed per use - no subscriptions, no provider accounts. You sign in with your Flowsta Identity.
Estimate only, assuming 3 input tokens per output token, at the catalog's current per-million-token rates.
Output price, compared
Privacy
Online models see only what you choose to send. You sign in with your Flowsta Identity - created by you, kept in your own Flowsta Vault, 24 words as the key - so there is no provider account behind your requests: they reach the provider with no identity attached. Your Own AI keeps your conversation history, memory, and documents on your device, and attachments only go online with your explicit consent - the app asks. License: Proprietary (API service).
Frequently asked questions
- How do I use GPT-5.3 Codex without a OpenAI account?
- Through Your Own AI: online models are an optional paid service you sign in to with your Flowsta Identity - one identity, created and kept by you, covers every model in the catalog. You pay per use; no provider subscriptions, no separate keys.
- What does GPT-5.3 Codex cost?
- $2.27 per million input tokens and $18 per million output tokens, with cached input at $0.23. The cost explorer on this page turns that into a monthly figure for your usage.
- How much context does GPT-5.3 Codex support?
- 391K tokens of context.
- Is my data used to train GPT-5.3 Codex?
- You sign in with a Flowsta Identity you hold yourself, so there is no provider profile to train against: requests reach the provider with no account or identifier attached, and Your Own AI keeps your history on your device. Attachments only go online with your explicit consent.
Use GPT-5.3 Codex the private way
Download the app, then sign in with a Flowsta Identity - yours to create, yours to keep - to add the online service. Pay per use, everything local stays local. No one in control but you.