GPT-5 Nano API Cost Calculator
Estimate your monthly API costs for GPT-5 Nano 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-4.1 Nano Openai | $0.1000 | $0.4000 |
| gpt-oss-safeguard-20b Openai | $0.0750 | $0.3000 |
| GPT-REALTIME-MINI Openai | $0.6000 | $0.0600 |
| gpt-oss-120b Openai | $0.0390 | $0.1900 |
| gpt-oss-20b Openai | $0.0300 | $0.1400 |
Frequently Asked Questions
How much does GPT-5 Nano cost per token?
GPT-5 Nano is priced at $0.0500 per 1M input tokens and $0.4000 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-5 Nano?
GPT-5 Nano has a context window of 400K tokens (400,000 tokens). The maximum output length is 128K tokens.
Does GPT-5 Nano support image inputs (vision)?
Yes, GPT-5 Nano supports vision/image inputs. You can send images as part of your prompts.
Does GPT-5 Nano support function calling (tool use)?
Yes, GPT-5 Nano 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-5 Nano compare to similar models?
GPT-5 Nano costs $0.0500 input and $0.4000 output per 1M tokens. gpt-oss-20b is less expensive at $0.0300 input and $0.1400 output per 1M tokens. See the "Compare with Similar Models" table above, or visit the gpt-oss-20b page at /tools/cost-calculator/openai/gpt-oss-20b.