OpenAI bills per token, split into input (your prompt) and output (the model's reply), priced per million tokens. Across the 8 models tracked here, output runs from GPT-5.4 mini at $4.5 per 1M output tokens up to GPT-Realtime-2 audio at $64. Input is cheaper, and cached input cheaper still. The table below has every model's exact rates, verified June 14, 2026.
| Model | Input / 1M | Output / 1M |
|---|---|---|
| GPT-5.5 | $5 | $30 |
| GPT-5.4 | $2.5 | $15 |
| GPT-5.4 mini | $0.75 | $4.5 |
| GPT-Realtime-2 audio | $32 | $64 |
| GPT-Realtime-2 text | $4 | $24 |
| GPT-Realtime-2 image | $5 | — |
| GPT-Image-2 image | $8 | $30 |
| GPT-Image-2 text | $5 | — |
Per-token billed across models in this catalog. Cached input typically 50-90% discount off standard input. The live page now features GPT-5.5, GPT-5.4, GPT-5.4 mini, and multimodal/realtime models. Previous GPT-4x, o1, o3, GPT-5, etc. models are no longer listed on this page.
Source: openai.com · Catalog 2026-06-14.2. Confirm the live rate before you commit.
The rates above are per unit. Your bill is those rates times how hard your code leans on OpenAI, plus everything around it. PrePrice scans your project, finds where you call OpenAI, and computes your real cost per user and what to charge.
Find your real cost — freeBy output-token price, GPT-5.4 mini is currently the cheapest OpenAI model at $4.5 per 1M output tokens and $0.75 per 1M input. The cheapest model per token is not always the cheapest per finished task, since a weaker model can need more retries or longer prompts.
OpenAI is pay-as-you-go and billed per token: you pay for input tokens (your prompt and context) and output tokens (the response) separately, priced per million tokens. There is no monthly base fee for the API itself.
The per-unit rate is only one of the four numbers that set your bill. The others are how much your app uses OpenAI, how often, and across how many users. Long prompts, retries, multi-step agents, and uncached repeated context all multiply the rate. PrePrice models that usage from your code so the number is real, not a guess.
From OpenAI's official pricing page (openai.com), verified June 14, 2026 and re-checked on a schedule. Pricing changes often, so confirm the live rate before you commit.
See the full AI Cost Index or estimate your monthly bill.