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OpenAI · Text and chat

GPT-5.3 Codex

GPT for developers

400k tokenssees photosreads files
5 gen / requestAvailable from plan Premium
Try GPT-5.3 Codex
Overview

What it can do GPT-5.3 Codex

GPT-5.3 Codex — OpenAI model for developers: writes code, finds bugs, explains external code, writes tests.

Best suited for

Code
  • ✓Writes and fixes code
  • ✓Explains errors
How to write prompts

Formula for a good prompt for GPT-5.3 Codex

  1. Rolerole for the model
  2. Taskwhat to do
  3. Contextwho it is for and why
  4. Formatlist, table, length
  5. Limitswhat to avoid

Tips specifically for this model

  • Attach the full error text.
✕ Bad

write about marketing

✓ OK

You are a marketer. Write 5 promo ideas for a flower shop for March 8, budget up to 20,000 ₽. Format: a list, one sentence per idea.

Examples

Ready-made prompts for high quality results

Copy the prompt, insert your details — and get an answer matching the sample.

01

Find a bug

This Python code crashes with KeyError on line 12. Find the root cause and suggest a fix with an explanation: [code]
Result: Cause and fix Try it →
02

Write a function

Write a TypeScript function that takes an array of orders {id, total, date} and returns the sum by month. With types and three tests in Vitest.
Result: Ready-made function with tests Try it →
What not to do

Mistakes that ruin the result

With GPT-5.3 Codex

  • Do not include API keys and passwords from code in your prompt.

General rules for text and chat

  • Do not ask a vague question without context.
  • Do not send passwords, card numbers, or passport details.
  • Do not accept numbers, laws, or medical advice without fact-checking.
  • Do not paste large text without explaining what to do with it.
Specifications

GPT-5.3 Codex in numbers

Section
Text and chat
Developer
OpenAI
Context
400k tokens
Understands
text, photos, files
Price
5 gen / request
Available from plan
Premium
Status
works on the website and in the bot
Price

How many costs

5 gen / request
PlanPriceEnough for
Freefree—
Premium450 ★ · 1 monthup to 90 requests
Premium1 200 ★ · 3 monthsup to 270 requests
Premium2 250 ★ · 6 monthsup to 540 requests
Premium4 200 ★ · 12 monthsup to 1 080 requests
All plans →

Questions about GPT-5.3 Codex

Did not find an answer? Message us, real people reply.

Contact support
How much does GPT-5.3 Codex cost?

5 generations per request. Generations are AskMeAI internal currency: included with Premium subscription and sold in one-off packs.

Can I try GPT-5.3 Codex for free?

GPT-5.3 Codex is available with a Premium subscription and one-time generation packs. You can try photo effects and chat with free models for free.

How to get the best result in GPT-5.3 Codex?

Include the full error message. Rely on the formula: role → task → context → format → constraints.

Where does GPT-5.3 Codex work?

On the askmeai.ru website studio and in the @GPT5Telegbot Telegram bot — shared balance.

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