GPT-4 API Cost Calculator
Estimate your monthly API costs for GPT-4 from Openai.
Pricing per 1M tokens
Pricing last verified: Mar 21, 2026
30-Day Price History
Solid line: input price · Dashed line: output price
Estimate Your Costs
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Cost Breakdown
Compare with Similar Models
| Model | Input/1M | Output/1M |
|---|---|---|
| GPT-4 (older v0314) Openai | $30.00 | $60.00 |
| o3 Pro Openai | $20.00 | $80.00 |
| o1 Openai | $15.00 | $60.00 |
| o3 Deep Research Openai | $10.00 | $40.00 |
| GPT-5 Pro Openai | $15.00 | $120.00 |
Frequently Asked Questions
How much does GPT-4 cost per token?
GPT-4 is priced at $30.00 per 1M input tokens and $60.00 per 1M output tokens. Use the calculator above to estimate your monthly costs based on your usage volume.
What is the context window for GPT-4?
GPT-4 has a context window of 8.2K tokens (8,191 tokens). The maximum output length is 4.1K tokens.
Does GPT-4 support function calling (tool use)?
Yes, GPT-4 supports function calling (also called tool use). You can define custom functions that the model can invoke as part of its responses.
How does GPT-4 compare to similar models?
GPT-4 costs $30.00 input and $60.00 output per 1M tokens. o3 Deep Research is less expensive at $10.00 input and $40.00 output per 1M tokens. See the "Compare with Similar Models" table above, or visit the o3 Deep Research page at /tools/cost-calculator/openai/o3-deep-research.