OpenAI: GPT-4o API Pricing
OpenAI: GPT-4o costs $2.50 per 1M input tokens and $10.00 per 1M output tokens (cache reads: $1.25). Context window: 128K. Prices verified 2026-10-21 · source
Alternatives to consider
Cheapest openai model — 99% less per month
Rebuilt daily from our snapshot archive — the chart appears once a model has 5+ snapshots of history.
From our own daily snapshot archive — independent of provider announcements.
Token economics
| Token type | Price | vs base input |
|---|---|---|
| Standard input | $2.50 | — |
| Cache read | $1.25 | −50% |
| Output | $10.00 | — |
Prompt caching stores repeated context server-side: reads cost far less, but writes carry a one-time premium.
Training data ends here — newer events require retrieval or web search.
What would OpenAI: GPT-4o cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $60.00 |
| Coding agent | 5,000 | 8,000 / 2,000 | $200.00 |
| RAG pipeline | 30,000 | 4,000 / 500 | $450.00 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $120.00 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About OpenAI: GPT-4o
GPT-4o ("o" for "omni") is OpenAI's latest AI model, supporting both text and image inputs with text outputs. It maintains the intelligence level of [GPT-4 Turbo](/models/openai/gpt-4-turbo) while being twice as...
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Frequently asked questions
How much does OpenAI: GPT-4o cost?
OpenAI: GPT-4o costs $2.50 per 1M input tokens and $10.00 per 1M output tokens; cached input tokens cost $1.25 per 1M. Verified 2026-10-21 — provider source.
What is the context window?
128K tokens, with up to 16K output tokens per response. That's roughly 160 pages of text in a single request.
Does it support prompt caching?
Yes — cached input is $1.25/1M, about 50% cheaper than standard input. Agents and RAG workloads with repeated context benefit most.
What's a cheaper alternative?
ScaleDown: Summarize saves about 99% on a typical workload with comparable quality.
Official resources
- OpenAI: GPT-4o on OpenRouter — live endpoint, pricing source of record.
- Artificial Analysis leaderboard → — independent intelligence and performance rankings.
- OpenAI pricing → — first-party pricing and billing details.
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