# GPT-5.3 Chat API prices

GPT-5.3 Chat (gpt) — 400k context, 128k max output.
5 metered per-token offers from 5 provider(s), in USD per 1M tokens.

| Provider | Input $/1M | Output $/1M | Cache read $/1M | Context |
| --- | --- | --- | --- | --- |
| 302.AI | $1.75 | $14 | — | 128k |
| Abacus | $1.75 | $14 | — | 400k |
| Merge Gateway | $1.75 | $14 | $0.175 | 128k |
| Opper | $1.75 | $14 | $0.175 | 128k |
| ZenMux | $1.75 | $14 | — | 128k |

## Summary

- Cheapest input: $1.75 per 1M tokens (302.AI)
- Cheapest output: $14 per 1M tokens (302.AI)
- First-party: not listed separately
- Free offers: none
- Subscription plans (not per-token): none
- Released: 2026-03-03
- Inputs: image, pdf, text

HTML page: https://llmprice.gitlab.io/models/gpt-5-3-chat/
Full dataset: https://llmprice.gitlab.io/data/catalog.json