OpenAI API pricing, checked nightly.
Every price below is read from OpenAI’s official pricing page each night and stored in an append-only history. No estimates, no smoothing: if a price changes, the change and its date are on record.
Current prices
| Model | Input / 1M | Output / 1M | Context | The Hobbit* |
|---|---|---|---|---|
| GPT-5.6 Luna · Lite | $0.2 | $1.20 | 1M | $0.1526 |
| GPT-5.6 Terra · Mid | $2.00 | $12.00 | 1M | $1.53 |
| GPT-5.6 Sol · Pro | $5.00 | $30.00 | 1M | $3.81 |
Scroll the table sideways to see every column.
* Cost to generate The Hobbit (95,356 words ≈ 127,141 tokens) as output. Word count verified against Project Gutenberg.
All tracked OpenAI models
| Model | Input / 1M | Output / 1M | Context |
|---|---|---|---|
| GPT-5.6 Sol Current flagship, generally available since 9 Jul 2026 | $5.00 | $30.00 | 1M |
| GPT-5.6 Terra Lower rate effective 30 Jul, verified by TokenScale 12 Aug | $2.00 | $12.00 | 1M |
| GPT-5.6 Luna Lower rate effective 30 Jul, verified by TokenScale 12 Aug | $0.2 | $1.20 | 1M |
| GPT-5.5 Previous flagship, still on the price list | $5.00 | $30.00 | 1M |
| GPT-5.4 Previous generation, still on the price list | $2.50 | $15.00 | 128K |
| GPT-5.4 mini Previous generation, cheapest OpenAI text model still sold | $0.75 | $4.50 | 128K |
| o3 Reasoning model, post May 2026 cut | $2.00 | $8.00 | 200K |
| o4 mini Fast reasoning, lower cost | $1.10 | $4.40 | 128K |
Scroll the table sideways to see every column.
Recent list-price changes
| Date | Tier | Was (in / out) | Now (in / out) |
|---|---|---|---|
| 2026-07-30 verified 2026-08-12 | GPT-5.6 Luna (tier) | $1.00 / $6.00 | $0.2 / $1.20 |
| 2026-07-30 verified 2026-08-12 | GPT-5.6 Terra (tier) | $2.50 / $15.00 | $2.00 / $12.00 |
| 2026-07-28 | GPT-5.6 Luna (tier) | $0.75 / $4.50 | $1.00 / $6.00 |
| 2026-05-15 | GPT-5.6 Luna (tier) | $0.15 / $0.6 | $0.75 / $4.50 |
| 2026-05-15 | GPT-5.6 Terra (tier) | $2.50 / $10.00 | $2.50 / $15.00 |
| 2026-05-15 | GPT-5.6 Sol (tier) | $2.00 / $8.00 | $5.00 / $30.00 |
Scroll the table sideways to see every column.
Changes are recorded the night they appear on the official pricing page, unless corrected to an earlier confirmed effective date. A date shown with a quieter verified line beneath it is when this repricing actually took effect at the provider; TokenScale's nightly check confirmed it later, on the verified date. The tier label shows the model currently in that slot; historical rows are never rewritten. Full history: the charts.
About these numbers. Prices are checked nightly against the official pricing page and recorded in an append-only history (data through 2026-08-21). Last hand-verified 2026-08-21. List prices only: promotions and limited-time discounts never enter the history. If a number is wrong, the correction is published, not buried: see the methodology.