OpenAI API pricing, verified 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-5.4 mini · Lite | $0.75 | $4.50 | 128K | $0.5721 |
| GPT-5.4 · Mid | $2.50 | $15.00 | 128K | $1.91 |
| GPT-5.5 · Pro | $5.00 | $30.00 | 1M | $3.81 |
* 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-5.4 mini Best value for high-volume tasks | $0.75 | $4.50 | 128K |
| GPT-5.4 Flagship multimodal model | $2.50 | $15.00 | 128K |
| GPT-5.5 Current GA reasoning flagship | $5.00 | $30.00 | 1M |
| GPT-5.6 Luna GPT-5.6 (preview) — fastest, lowest cost | $1.00 | $6.00 | 1M |
| GPT-5.6 Terra GPT-5.6 (preview) — GPT-5.5-class quality at half cost | $2.50 | $15.00 | 1M |
| GPT-5.6 Sol GPT-5.6 (preview) — flagship, limited access | $5.00 | $30.00 | 1M |
| o3 Reasoning model — post May 2026 cut | $2.00 | $8.00 | 200K |
| o4 mini Fast reasoning, lower cost | $1.10 | $4.40 | 128K |
Recent list-price changes
| Date | Tier | Was (in / out) | Now (in / out) |
|---|---|---|---|
| 2026-05-15 | GPT-5.4 mini (tier) | $0.15 / $0.6 | $0.75 / $4.50 |
| 2026-05-15 | GPT-5.4 (tier) | $2.50 / $10.00 | $2.50 / $15.00 |
| 2026-05-15 | GPT-5.5 (tier) | $2.00 / $8.00 | $5.00 / $30.00 |
| 2026-05-12 | GPT-5.4 (tier) | $5.00 / $20.00 | $2.50 / $10.00 |
| 2026-05-12 | GPT-5.5 (tier) | $10.00 / $40.00 | $2.00 / $8.00 |
Changes are recorded the night they appear on the official pricing page. 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 2026-07-07). Last hand-verified 2026-07-06. 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.