GPT-5.3 Chat vs GPT-5.3-Codex
Both have similar output pricing, while GPT-5.3-Codex offers a larger context window. Choose GPT-5.3 Chat or GPT-5.3-Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5.3 Chat | GPT-5.3-Codex |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input / 1M tokens | $1.75 | $1.75 |
| Output / 1M tokens | $14.00 | $14.00 |
| Context window | 128K | 400K |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Feb 2026 |
| LMArena (Chatbot Arena) Elo score | 1389 | — |
| LiveBench score | — | 73.2 |
| Epoch Capabilities Index score | — | 157 |
| LMArena WebDev Elo score | — | 1406 |
FAQ
Is GPT-5.3 Chat or GPT-5.3-Codex cheaper?
GPT-5.3 Chat and GPT-5.3-Codex have comparable output pricing.
Which has the larger context window, GPT-5.3 Chat or GPT-5.3-Codex?
GPT-5.3-Codex has the larger context window (400K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.