# OpenAI: GPT-5.3-Codex

- Model id: `openai/gpt-5.3-codex`
- Served by: -
- List price per 1M tokens, input / output, from: -, with 0% platform fee. A request is billed at the list price of the host that served it.
- Context: 400K, max output 128K
- Prices read 2026-11-15 09:33 UTC
- Page: https://plaingateway.com/models/openai/gpt-5.3-codex

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...

## Hosts

| Host | Endpoint | In / out /M | Cache read /M | Context | Served |
|---|---|---|---|---|---|
| Azure | `azure` | $1.75 / $14.00 | $0.175 | 400K | no |
| OpenAI | `openai` | $1.75 / $14.00 | $0.175 | 400K | no |
| OpenAI | `openai/fast` | $3.50 / $28.00 | $0.35 | 400K | no |

## First request

```sh
curl https://api.plaingateway.com/api/v1/chat/completions \
  -H "Authorization: Bearer $PLAINGATEWAY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/gpt-5.3-codex", "messages": [{"role": "user", "content": "Say hello in five words."}]}'
```

Sign up at https://plaingateway.com/signup (no card), create a key, send a test call, and add credits when you want more. New accounts may get a small starting credit. The whole bootstrap for agents: https://plaingateway.com/llms.txt