GPT-5.3 Chat
Updated Sep 11, 2026
gpt400k context128k max outputreleased Mar 3, 2026ReasoningTool calling
Official
—
output per 1M tokens
Providers
5
offering this model
Spread
1.0×
max / min output
Offers
Metered per-token prices. Cheapest input and output are highlighted; † marks a context-tier surcharge.
| Provider | 1M input | 1M output | 1M cache read | 1M cache write | Context |
|---|---|---|---|---|---|
| 302.AI | Cheapest$1.75 | Cheapest$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 |
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