API pricing · 29 models
OpenAI API pricing
What every OpenAI model costs per 1M tokens through the API, with the extra charges and discounts that change the bill.
Prices from OpenAI's pricing page as of
Prices per 1M tokens
US dollars, standard processing. The last column is what one request with 1,000 input and 500 output tokens costs; try your own volumes in the cost calculator.
| Model | Input | Cached input | Cache write | Output | 1K in + 500 out |
|---|---|---|---|---|---|
| GPT-6 | |||||
| GPT-6 Astragpt-6-astra | $10.00 | $1.00 | $12.50 | $50.00 | $0.035 |
| GPT-5.6 | |||||
| GPT-5.6 Solpromo pricegpt-5.6-sol | $4.00 | $0.40 | $5.00 | $20.00 | $0.014 |
| GPT-5.6 Terragpt-5.6-terra | $2.00 | $0.20 | $2.50 | $12.00 | $0.008 |
| GPT-5.6 Lunagpt-5.6-luna | $0.20 | $0.02 | $0.25 | $1.20 | $0.0008 |
| GPT-5.5 | |||||
| GPT-5.5gpt-5.5 | $5.00 | $0.50 | — | $30.00 | $0.02 |
| GPT-5.5 Progpt-5.5-pro | $30.00 | — | — | $180.00 | $0.12 |
| GPT-5.4 | |||||
| GPT-5.4gpt-5.4 | $2.50 | $0.25 | — | $15.00 | $0.01 |
| GPT-5.4 Progpt-5.4-pro | $30.00 | — | — | $180.00 | $0.12 |
| GPT-5.4 minigpt-5.4-mini | $0.75 | $0.075 | — | $4.50 | $0.003 |
| GPT-5.4 nanogpt-5.4-nano | $0.20 | $0.02 | — | $1.25 | $0.00083 |
| GPT-5.3 and 5.2 | |||||
| GPT-5.3 Codexgpt-5.3-codex | $1.75 | $0.175 | — | $14.00 | $0.0088 |
| GPT-5.2gpt-5.2 | $1.75 | $0.175 | — | $14.00 | $0.0088 |
| GPT-5.2 Progpt-5.2-pro | $21.00 | — | — | $168.00 | $0.11 |
| GPT-5.1 and 5 | |||||
| GPT-5.1gpt-5.1 | $1.25 | $0.125 | — | $10.00 | $0.0063 |
| GPT-5gpt-5 | $1.25 | $0.125 | — | $10.00 | $0.0063 |
| GPT-5 Progpt-5-pro | $15.00 | — | — | $120.00 | $0.075 |
| GPT-5 minigpt-5-mini | $0.25 | $0.025 | — | $2.00 | $0.0013 |
| GPT-5 nanogpt-5-nano | $0.05 | $0.005 | — | $0.40 | $0.00025 |
| GPT-4.1 and GPT-4o | |||||
| GPT-4.1gpt-4.1 | $2.00 | $0.50 | — | $8.00 | $0.006 |
| GPT-4.1 minigpt-4.1-mini | $0.40 | $0.10 | — | $1.60 | $0.0012 |
| GPT-4.1 nanogpt-4.1-nano | $0.10 | $0.025 | — | $0.40 | $0.0003 |
| GPT-4ogpt-4o | $2.50 | $1.25 | — | $10.00 | $0.0075 |
| GPT-4o minigpt-4o-mini | $0.15 | $0.075 | — | $0.60 | $0.00045 |
| o-series reasoning | |||||
| o3o3 | $2.00 | $0.50 | — | $8.00 | $0.006 |
| o3-proo3-pro | $20.00 | — | — | $80.00 | $0.06 |
| o3-minio3-mini | $1.10 | $0.55 | — | $4.40 | $0.0033 |
| o4-minio4-mini | $1.10 | $0.275 | — | $4.40 | $0.0033 |
| o1o1 | $15.00 | $7.50 | — | $60.00 | $0.045 |
| o1-proo1-pro | $150.00 | — | — | $600.00 | $0.45 |
Long-context prices
Rates that apply once a request passes the threshold, per 1M tokens.
| Model | Applies above | Input | Cached input | Output |
|---|---|---|---|---|
| GPT-6 Astra | 272K | $20.00 | $2.00 | $75.00 |
| GPT-5.6 Sol | 272K | $8.00 | $0.80 | $30.00 |
| GPT-5.6 Terra | 272K | $4.00 | $0.40 | $18.00 |
| GPT-5.6 Luna | 272K | $0.40 | $0.04 | $1.80 |
| GPT-5.5 | 272K | $10.00 | $1.00 | $45.00 |
| GPT-5.4 | 272K | $5.00 | $0.50 | $22.50 |
When promotional prices end
These models are on launch or promotional pricing. The table shows the current rate next to the rate OpenAI has announced for afterwards.
| Model | Current price until | Input now → later | Output now → later |
|---|---|---|---|
| GPT-5.6 Sol | at least Nov 21, 2026 | $4.00 → not announced | $20.00 → not announced |
Recent OpenAI changes
Model launches, price changes and retirements, newest first.
GPT-5.5 to leave ChatGPT, ChatGPT Work and Codex on October 14
Announced by OpenAI's @ChatGPT account. The OpenAI API is not affected: the deprecations page lists no shutdown for gpt-5.5.
Read the storyindependentGizmochina, citing @ChatGPT
gpt-5.4-cyber deprecated, removal on October 1, 2026
Replacement: gpt-5.6-cyber.
vendorOpenAI deprecations
GPT-6 Astra released at $10 / $50 per 1M tokens
$20 / $75 above 272K input tokens. Batch and Flex at half price, Fast mode at double.
GPT-5.6 Sol cut to $4 / $20 on a promotion
20% lower input and 33% lower output. The promotional price runs at least through November 21, 2026.
GPT-5.6 Luna 80% cheaper, Terra 20% cheaper; Fast mode replaces Priority
Luna now costs $0.20 / $1.20 and Terra $2 / $12. Fast mode costs twice the standard rate.
vendorOpenAI API changelog
Billing rules that change the price
- GPT-5.6 Sol's $4 / $20 price is promotional and available at least through November 21, 2026. OpenAI cut it on August 21, 2026, by 20% on input and 33% on output, and has not said what it will cost after the promotion.
- Batch API: 50% off both input and output. Flex processing is priced like Batch on select models.
- Fast mode costs 2x the standard rate. It is the new name for Priority processing since July 30, 2026, and requests tagged priority still work.
- Cache writes are listed for GPT-6 Astra and the GPT-5.6 family at 1.25x the input price.
- Regional processing (data residency) endpoints add 10% for eligible models released on or after March 5, 2026.
- GPT-6 Astra, the GPT-5.6 family, GPT-5.5 and GPT-5.4 switch to long-context rates once a prompt exceeds 272K input tokens.
- Pro models have no cached-input discount.
- The gpt-5.6 alias routes requests to gpt-5.6-sol.
Questions
How much does the OpenAI API cost?
OpenAI lists 29 models. Input costs from $0.05 (GPT-5 nano) to $150.00 (o1-pro) per 1M tokens, and output from $0.40 (GPT-5 nano) to $600.00 (o1-pro). A request with 1,000 input and 500 output tokens costs between $0.00025 and $0.45.
What is the cheapest OpenAI API model?
By the cost of a 1,000-input, 500-output request, GPT-5 nano is the cheapest: $0.05 input and $0.40 output per 1M tokens, about $0.00025 per request.
Does the OpenAI API have a batch discount?
Yes. The Batch API costs 50% less than standard rates, for both input and output.
Related
Where these numbers come from
Prices are copied from the vendor's own pages; the vendor page is the authority on what you are billed. Per-request costs are our arithmetic.
| Field | Source | Observed |
|---|---|---|
| API prices per 1M tokens, all models | vendorOpenAI API pricing | Sep 16, 2026 |
| Shutdown schedule | vendorOpenAI deprecations | Sep 16, 2026 |
| Cost of 1,000 input + 500 output tokens | derivedCalculated from the prices above | Sep 16, 2026 |