OpenAI
GPT API pricing
7 GPT models on OpenAI's standard API tier. The cheapest is GPT-5 nano at $0.05 per million input tokens. Source: OpenAI's pricing page, checked 1 Nov 2026.
| Model | Input / 1M | Cached input / 1M | Output / 1M | Notes |
|---|---|---|---|---|
| GPT-5 nano | $0.05 | $0.005 | $0.40 | |
| GPT-6 Luna | $0.10 | $0.01 | $0.50 | Above 272,000 prompt tokens: $0.20 in, $0.75 out. |
| GPT-5.4 mini | $0.75 | $0.075 | $4.50 | |
| GPT-6.1 Terra | $1 | $0.05 | $5 | Above 272,000 prompt tokens: $2 in, $7.50 out. |
| GPT-6.1 Sol | $2 | $0.10 | $10 | Above 272,000 prompt tokens: $4 in, $15 out. |
| GPT-5.5 | $5 | $0.50 | $30 | Above 272,000 prompt tokens: $10 in, $45 out. |
| GPT-6 Astra | $10 | $1 | $50 | Above 272,000 prompt tokens: $20 in, $75 out. |