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The GPT API Cost Calculator estimates your monthly OpenAI API expense based on model selection, token usage, and call volume. It covers GPT-4o, GPT-4-turbo, GPT-4, GPT-3.5-turbo, and o1 models with separate input and output token pricing.

Công thức

Monthly Cost = (Input Tokens × Input Price/1K) + (Output Tokens × Output Price/1K)

T_in: Input Tokens (tokens/request) — Average tokens sent per API call (prompt + system message)
T_out: Output Tokens (tokens/request) — Average tokens generated per API response
N: Monthly API Calls (calls/month) — Total number of API requests per month
P_in: Input Price ($/1M tokens) — Price per million input tokens for selected model
P_out: Output Price ($/1M tokens) — Price per million output tokens for selected model

Hướng dẫn từng bước

1Select the OpenAI model (GPT-4o, GPT-4-turbo, GPT-3.5-turbo, o1, etc.)
2Enter your average input tokens per request and output tokens per response
3Specify the number of API calls per day or month
4View the total monthly cost with a breakdown of input vs. output expenses

Ví dụ có lời giải

đầu vào

GPT-4o: 1,000 input tokens, 500 output tokens per call, 10,000 calls/month

Kết quả

Input: 10M tokens × $2.50/1M = $25.00. Output: 5M tokens × $10.00/1M = $50.00. Total: $75.00/month.

đầu vào

GPT-4-turbo: 2,000 input + 1,000 output per call, 50,000 calls/month

Kết quả

Input: 100M tokens × $10.00/1M = $1,000. Output: 50M tokens × $30.00/1M = $1,500. Total: $2,500/month.

Lỗi thường gặp cần tránh

✕Using the same price for input and output tokens — output tokens are typically 2-4x more expensive than input tokens
✕Not accounting for system prompt tokens that are sent with every API call, adding significant hidden cost at scale
✕Ignoring token overhead from conversation history in chat-based applications, which grows with each turn

Câu hỏi thường gặp

How much does GPT-4o cost per message?

A typical GPT-4o conversation message costs $0.003-$0.01 (about a third of a cent to one cent). With 500 input tokens and 300 output tokens: ($2.50 × 500 + $10.00 × 300) / 1,000,000 = $0.0043 per message. At scale, this adds up quickly — 1 million messages would cost approximately $4,300.

Is GPT-4o cheaper than GPT-4-turbo?

Yes, significantly. GPT-4o input tokens cost $2.50/1M vs. GPT-4-turbo at $10.00/1M (75% cheaper input), and output tokens cost $10.00/1M vs. $30.00/1M (67% cheaper output). GPT-4o also offers faster response times, making it the better choice for most production workloads.

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