TokenAtlasWhat GPT-4o actually costs
GPT-4o is billed per token. As of 2026, OpenAI charges approximately $2.50 per million input tokens and $10.00 per million output tokens. That sounds tiny — until you multiply by a million calls a month. The TokenAtlas GPT-4o calculator turns those numbers into a real monthly bill so finance and engineering see the same picture.
How to estimate GPT-4o spend
Work it through with one concrete scenario. A 1,000-token prompt with a 500-token reply on GPT-4o costs $0.0075 per call at OpenAI's $2.50 input / $10.00 output per-million rates. Run that 1,000 times a day and you are at roughly $7.50 a day, or about $225.00 a month. Change any of the three inputs — average input tokens, average output tokens, calls per day — and the GPT-4o projection updates with it, so you can size the workload before you commit to it.
Context window: 128K tokens
GPT-4o ships with a 128K tokens context window. Longer prompts mean more input tokens on every call. If you're running RAG with large retrieved chunks, this calculator shows you exactly how much that retrieval is costing per request.
Best fit: multimodal reasoning at production scale
GPT-4o is strongest at multimodal reasoning at production scale. If your workload doesn't match that profile, swap it for a cheaper or faster model — the calculator's compare view runs the same scenario across every major provider.
What the calculator outputs
For GPT-4o the calculator returns cost per call, daily, monthly and annual burn, and cost per active user at the volume you enter. Because output tokens are priced at $10.00 per million against $2.50 for input, the output-length slider moves the total more than prompt size does on this model — the breakdown shows that split explicitly. The compare view then re-runs the identical scenario on GPT-4o mini or DeepSeek V3 so you can see, in dollars, what GPT-4o costs you above the cheaper option for multimodal reasoning at scale.
Frequently asked questions
- Is the GPT-4o pricing data up to date?
- Yes — TokenAtlas tracks OpenAI's pricing page and ships updates within 24 hours of any change.
- Does this include image, audio or fine-tuned model pricing?
- Text in/out is covered for GPT-4o. Multimodal and fine-tuned variants are tracked separately.
- Can I save scenarios?
- Free accounts can save up to 5 scenarios. Pro and Team plans get unlimited saved calculations and exports.
- How accurate are the estimates?
- Within ~3% of your real bill assuming consistent token counts.