OpenAI
OpenAI API Pricing 2026
Current API prices per 1 million tokens.
Model
| Model | Rate | Price / 1M tokens |
|---|---|---|
| GPT-6 Astra OpenAI's most capable model for complex reasoning, coding, computer use, research and end-to-end professional work. 1,050,000 context · 128,000 max output · Apr 30, 2026 knowledge cutoff · text/image input · reasoning effort: low, medium, high, xhigh, max. Standard pricing is $10 input, $1 cached input, $12.50 cache write and $50 output per 1M tokens. Requests with more than 272K input tokens are billed at 2x input/cache rates and 1.5x output for the full request. Batch and Flex are 50% of Standard; Fast mode is 2x. Astra is rolling out first to limited organizations, with broader API and paid ChatGPT access over the coming days. | Input — Standard | $10 |
| GPT-6 Astra | Cached input — Standard | $1 |
| GPT-6 Astra | Cache write — Standard | $12.5 |
| GPT-6 Astra | Output — Standard | $50 |
| GPT-6.1 Sol OpenAI reasoning model with near-Astra performance for complex coding, computer use and professional work at a lower cost. 1.05M context · 128K max output · text/image input · reasoning low/medium/high/xhigh/max. Standard pricing. Requests with more than 272K input tokens are billed at 2x input/cache rates and 1.5x output for the full request. Batch and Flex are 50% lower than Standard; Fast mode is 2x. | Input — Standard, ≤272K input | $2 |
| GPT-6.1 Sol | Cached input — Standard, ≤272K | $0.1 |
| GPT-6.1 Sol | Cache write — Standard, ≤272K | $2.5 |
| GPT-6.1 Sol | Output — Standard, ≤272K input | $10 |
| GPT-6.1 Sol | Input — Standard, >272K input | $4 |
| GPT-6.1 Sol | Cached input — Standard, >272K | $0.2 |
| GPT-6.1 Sol | Cache write — Standard, >272K | $5 |
| GPT-6.1 Sol | Output — Standard, >272K input | $15 |
| GPT-6 Sol OpenAI reasoning model for complex coding and agentic workflows. 1.05M context · 128K max output · text/image input · reasoning none/low/medium/high/xhigh/max. Standard pricing. OpenAI applies the long-context tier above 272K input tokens. | Input — Standard, ≤272K input | $2 |
| GPT-6 Sol | Cached input — Standard, ≤272K | $0.2 |
| GPT-6 Sol | Cache write — Standard, ≤272K | $2.5 |
| GPT-6 Sol | Output — Standard, ≤272K input | $10 |
| GPT-6 Sol | Input — Standard, >272K input | $4 |
| GPT-6 Sol | Cached input — Standard, >272K | $0.4 |
| GPT-6 Sol | Cache write — Standard, >272K | $5 |
| GPT-6 Sol | Output — Standard, >272K input | $15 |
| GPT-6 Luna OpenAI's efficient GPT-6 model for focused, high-volume tasks. 1.05M context · 128K max output · text/image input · reasoning none/low/medium/high/xhigh/max. Standard pricing. OpenAI applies the long-context tier above 272K input tokens. | Input — Standard, ≤272K input | $0.1 |
| GPT-6 Luna | Cached input — Standard, ≤272K | $0.01 |
| GPT-6 Luna | Cache write — Standard, ≤272K | $0.125 |
| GPT-6 Luna | Output — Standard, ≤272K input | $0.5 |
| GPT-6 Luna | Input — Standard, >272K input | $0.2 |
| GPT-6 Luna | Cached input — Standard, >272K | $0.02 |
| GPT-6 Luna | Cache write — Standard, >272K | $0.25 |
| GPT-6 Luna | Output — Standard, >272K input | $0.75 |
| 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 |
| GPT-5.6 Terra Balanced GPT-5.6 tier for strong intelligence at lower cost than Sol. 1.05M context · 128K max output · text/image input · reasoning and tools. Requests above 272K input tokens cost 2x input and 1.5x output for the full request; cache writes cost 1.25x uncached input. | Input | $2 |
| GPT-5.6 Terra | Cached input | $0.2 |
| GPT-5.6 Terra | Output | $12 |
| GPT-5.6 Luna Cost-optimized GPT-5.6 tier for high-volume workloads. 1.05M context · 128K max output · text/image input · reasoning and tools. Requests above 272K input tokens cost 2x input and 1.5x output for the full request; cache writes cost 1.25x uncached input. | Input | $0.2 |
| GPT-5.6 Luna | Cached input | $0.02 |
| GPT-5.6 Luna | Output | $1.2 |
| GPT-5.5 Previous flagship generation retained for comparison and existing integrations. Previous-generation GPT model; prefer GPT-5.6 for new integrations. | Input | $5 |
| GPT-5.5 | Cached input | $0.5 |
| GPT-5.5 | Output | $30 |
| GPT-5.4 Earlier lower-cost GPT tier retained for price history and compatibility. Previous-generation model; compare with GPT-5.6 Terra for new workloads. | Input | $2.5 |
| GPT-5.4 | Cached input | $0.25 |
| GPT-5.4 | Output | $15 |
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