AI API Pricing Calculator
Compare costs across 10+ AI models. Find the cheapest option and see how much you could save by switching.
Your Usage
~100 requests/day
Token Estimator
Estimated: ~260 tokens
Rule: 1000 words ≈ 1300 tokens
Advanced Settings
Cost Comparison
Monthly Cost💰 Potential Savings
Switch from GPT-4 Turbo to DeepSeek V3 to save:
All Models Ranked
API Pricing Reference (per 1M tokens)
| Model | Provider | Input | Output | Context | MMLU |
|---|---|---|---|---|---|
| DeepSeek V3 | DeepSeek | $0.14 | $0.28 | 128K | 89.1% |
| GPT-5 Turbo | OpenAI | $3.00 | $12.00 | 200K | 94.5% |
| Claude 4.5 Opus | Anthropic | $8.00 | $24.00 | 500K | 93.8% |
| Gemini 1.5 Flash | $0.07 | $0.30 | 1000K | 78.9% | |
| GPT-4o (Legacy) | OpenAI | $2.50 | $10.00 | 128K | 88.7% |
| Claude 3.5 Sonnet | Anthropic | $3.00 | $15.00 | 200K | 88.7% |
* Prices as of November 2025. Prices may change. Always verify on official pricing pages.
How to Calculate LLM API Costs
1 Understanding Token Pricing
AI APIs charge based on tokens, not words. A token is roughly 4 characters or ¾ of a word in English. Most providers charge separately for input tokens (your prompts) and output tokens (the AI's response).
Token Conversion:
- • 1,000 words ≈ 1,300 tokens
- • 1 page of text ≈ 500-800 tokens
- • A tweet ≈ 50-100 tokens
2 Calculating Monthly Costs
Your monthly API cost depends on three factors: number of requests, average input tokens per request, and average output tokens per request.
Monthly Cost =
(Input Tokens × Input Price) +
(Output Tokens × Output Price)
Cheapest GPT-4 Alternatives in 2025
DeepSeek V3
The 2025 Value King
Delivers 95% of GPT-5's performance at 1/20th the cost. The new standard for production APIs.
Gemini 1.5 Flash
Cheapest Option
Ultra-cheap with 1M context window. Great for high-volume, simpler tasks.
Claude 3.5 Sonnet
Best for Coding
Top coding benchmark scores. Worth the premium for development tasks.
Need More Help Choosing?
Our AI Finder helps you pick the perfect model based on your specific use case, budget, and requirements.
Try AI FinderFrequently Asked Questions
What is the cheapest AI API in 2025?
Gemini 1.5 Flash is the absolute cheapest at $0.075/1M input tokens. However, DeepSeek V3 at $0.14/$0.28 per 1M tokens delivers 95% of GPT-5's performance at 1/20th the cost - making it the best value for quality-conscious developers in 2025.
How much does GPT-4 API cost per month?
GPT-4 Turbo costs $10/1M input and $30/1M output tokens. For 3,000 monthly requests with average usage (500 input, 300 output tokens), you'd pay approximately $45-60/month. GPT-4o is cheaper at $2.50/$10 per 1M tokens.
How do I convert words to tokens?
As a rule of thumb, 1,000 English words equals approximately 1,300 tokens. For other languages, the ratio may be higher. You can also count approximately 4 characters per token, or ¾ of a word per token.
Is Claude cheaper than GPT-4?
It depends on which models you compare. Claude 3.5 Sonnet ($3/$15 per 1M) is cheaper than GPT-4 Turbo ($10/$30) but more expensive than GPT-4o ($2.50/$10). Claude 3 Haiku ($0.25/$1.25) is the cheapest Claude option and beats GPT-3.5 Turbo on price.