OpenAI API
GPT-5.6 Sol API Pricing 2026 — Cost per 1 Million Tokens
Current GPT-5.6 Sol API pricing from OpenAI per 1 million tokens, including input, output and cached-token rates when available.
| Model | Rate | Price / 1M tokens |
|---|---|---|
| GPT-5.6 Sol OpenAI's flagship GPT-5.6 model for complex professional work, reasoning and coding. 1.05M context · 128K max output · text/image input · reasoning and tools. Promotional API pricing is $4 input, $0.40 cached input and $20 output per 1M tokens, available at least through November 21, 2026. Requests above 272K input tokens cost 2x input and 1.5x output for the full request; cache writes cost 1.25x uncached input. | Input — promotional pricing | $4 |
| GPT-5.6 Sol | Cached input — promotional pricing | $0.4 |
| GPT-5.6 Sol | Output — promotional pricing | $20 |
How API token cost is calculated
Multiply the number of tokens by the provider rate, then divide by 1,000,000.
cost = tokens × price per 1M ÷ 1,000,000
Example: 250,000 input tokens at $2 / 1M = $0.50.
AI Price History
- GPT-5.6 Sol — Input — promotional pricing $5 → $4
- GPT-5.6 Sol — Cached input — promotional pricing $0.5 → $0.4
- GPT-5.6 Sol — Output — promotional pricing $30 → $20