LLM Cost Comparison Calculator
Compare monthly token costs across major LLM models — GPT-4o, Claude, Gemini, and more — for your specific workload.
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How to use this calculator
- 1
Enter the average number of input tokens per request (your prompt + context).
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Enter the average number of output tokens per request (model response length).
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Enter your expected number of requests per month.
- 4
Review the monthly cost across all major LLM models to find the best fit.
Frequently asked questions
How do I count tokens?
A rough rule is 1 token ≈ 4 characters or ¾ of a word. Most providers expose a tokenizer tool. OpenAI offers tiktoken; Anthropic Claude uses similar BPE tokenization. Log token_usage from real API responses for accurate figures.
Are these prices up to date?
Prices reflect published rates as of mid-2025. LLM pricing changes frequently — always verify on each provider's official pricing page before finalizing your budget.
Which model should I choose?
Cost is only one factor. GPT-4o and Claude Sonnet offer the highest capability; their mini/haiku variants trade some quality for dramatically lower cost. Test your specific tasks before optimizing purely on price.
LLM Cost Comparison Calculator — GPT-4o vs Claude vs Gemini
Why LLM costs vary so much
Each model provider prices input and output tokens separately, and output tokens are typically 4–10× more expensive than input tokens. A workload with long responses will cost disproportionately more on high-output-rate models. This calculator surfaces those differences instantly so you can architect your application for the right cost/quality trade-off.
Practical tips to reduce LLM spend
Use prompt caching for repeated system prompts, route simple tasks to smaller models (GPT-4o-mini or Claude Haiku), and stream responses so users see output faster. Batching non-urgent requests can also unlock discounted batch pricing on some providers.
Learn more from an authoritative source:
OpenAI Platform DocsAI Token Counter
Estimate the number of tokens in your text for GPT-4, Claude, Gemini, and other LLMs. Useful for staying within context limits.
AI Prompt Cost Calculator
Calculate the cost of an AI API call based on input/output tokens and model pricing.
Words to Tokens Converter
Convert between words, characters, tokens, and pages for AI models and content planning.
AI API Budget Calculator
Plan your monthly AI API budget based on usage volume, model selection, and request patterns.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →