API Cost Calculator
Data verifiedEnter your monthly call volume and message size to see exactly what every major AI API will cost you — from $0.30/mo to $1,500/mo depending on the model. Results update in real time and the URL is shareable.
AI API pricing is measured in cost per million tokens ($/1M). Each API call uses input tokens (your prompt) and output tokens (the model response). To calculate monthly cost: multiply your monthly call volume by tokens per call, then multiply by the model rate. For example, 10,000 calls with 500 input tokens and 1,000 output tokens using Claude Sonnet 4.6 at $3.00 input / $15.00 output = (5M × $3.00 + 10M × $15.00) / 1M = $15 + $150 = $165/month.
Enter your monthly API call volume and average message size (input + output tokens per call). The calculator multiplies your token usage by each model's published $/1M token rate and shows the monthly cost ranked from cheapest to most expensive.
For most workloads, Gemini Flash and DeepSeek V3 are the cheapest capable AI APIs — both under $0.30/1M tokens input. At 100K calls with medium-length messages, they cost under $20/month vs $250+ for GPT-5.4.
Claude Sonnet 4.6 costs $3.00/1M input tokens and $15.00/1M output tokens. At 10,000 medium-length calls per month (~500 input + 1,000 output tokens each), that's roughly $180/month. Use the calculator above to enter your specific volume.
GPT-5.4 costs $2.50/1M input tokens and $15.00/1M output tokens. At 10,000 medium calls per month, that's roughly $165/month. At 100K calls, approximately $1,650/month. DeepSeek V3 at the same volume costs around $30–40.
Roughly 1 token ≈ 4 characters ≈ 0.75 words. A typical email is 300–500 tokens. A 1,000-word article is ~1,300 tokens. Each API call has separate input tokens (your prompt) and output tokens (the model's response). Both are billed separately, usually with output costing 3–5× more than input.
Yes — all prices are sourced directly from provider API documentation and updated when providers change pricing. UseRightAI tracks price changes and logs them in the changes feed. Last verified prices are shown in the Data Verified badge.
