OpenAI Price Calculator
Estimate OpenAI API costs for GPT-5.6 Sol, Terra, Luna, and 50+ models
The most comprehensive free OpenAI cost calculator we've seen, covering 50+ models including the newest GPT-5.6 family. Perfect for quick budgeting, but don't expect billing integration or historical tracking. Pair it with OpenRouter for multi-provider comparisons.
- Developers estimating API costs for new features or projects
- Content creators budgeting text generation expenses
- Businesses planning AI-powered workflows and cost projections
- Freelancers and agencies quoting AI project costs
- Users needing cost estimation for non-OpenAI providers
- Those looking for real-time billing or usage tracking
- Enterprise customers needing custom pricing or volume discounts
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In short
OpenAI Price Calculator — Estimate OpenAI API costs for GPT-5.6 Sol, Terra, Luna, and 50+ models. Best for Developers estimating API costs for new features or projects, Content creators budgeting text generation expenses, Businesses planning AI-powered workflows and cost projections. Free to use.
Viability Score
How likely is OpenAI Price Calculator to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Cost estimation for over 50 OpenAI models
- Support for GPT-5.6 Sol, Terra, Luna, GPT-5.5, o4-mini, o3-pro, real-time models
- Input token cost per million tokens
- Output token cost per million tokens
- Input caching cost support
- Real-time calculation with instant results
- Interactive sliders for input and output tokens
- Word-to-token conversion (~750 words = 1000 tokens)
- Mobile-friendly web interface
- No sign-up or account required
- Cost optimization tips and best practices
- Links to related calculators (Claude, Gemini, Cohere, DALL-E, Whisper, TTS)
- Search Preview model pricing included
- Deep Research model pricing included
About OpenAI Price Calculator
The OpenAI Price Calculator by InvertedStone is a free, interactive tool for estimating API costs across OpenAI's full model lineup, including the latest GPT-5.6 Sol, Terra, Luna, GPT-5.5, o4-mini, o3-pro, real-time models, and more. Simply select a model, input token counts (or use sliders), and the calculator instantly returns input, output, and total costs based on current per-million-token rates. It also accounts for input caching discounts where available. Designed for developers, content creators, and businesses that rely on OpenAI's API, the calculator eliminates guesswork with a clean interface and real-time updates. It covers over 50 distinct models, from flagship reasoning models like o3-pro to cost-efficient nano variants and multimodal models like GPT-4o Search Preview. The pricing data is regularly updated to reflect OpenAI's official rates, making it reliable for budgeting and financial planning. The calculator also includes a word-to-token conversion reference and supports caching optimization tips. Beyond the calculator, InvertedStone offers related resources such as Multi-AI scripts for Google Sheets and Airtable, blog posts on cost reduction, and other model-specific calculators (Claude, Gemini, Cohere, DALL-E, Whisper). It's a no-nonsense tool for anyone needing fast, accurate cost estimation without signing up, but it lacks multi-provider comparisons or usage tracking.
Behind the Verdict
If you're a developer or team managing OpenAI API spend, this calculator is hard to beat for zero-friction cost estimation. It covers over 50 models — everything from GPT-5.6 Sol down to GPT-5 nano and real-time variants — with updated per-token rates. The slider interface and instant calculation make it ideal for quick what-if scenarios, and the caching toggle helps you see potential savings. Where it falls short: it's a pure estimator with no usage tracking or billing integration. You can't import past usage or set budget alerts. If you're managing a multi-provider stack, you'll still need something like OpenRouter or your own spreadsheet for side-by-side comparisons. The closest alternative is the official OpenAI API pricing page, but it's less interactive and harder to use for quick estimates. This tool is free, requires no sign-up, and works on mobile — a clear win for ad-hoc budgeting. Caveat: pricing here is a snapshot; verify high-stakes figures against OpenAI's current published rates. But for day-to-day planning, we'd reach for this first.
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Use Cases
- Estimate costs before building a chatbot that uses GPT-5.5.
- Compare pricing across GPT-5.4, o4-mini, and GPT-4.1 for a text generation project.
- Budget API spend for a content pipeline generating thousands of product descriptions.
- Plan token usage for a real-time application using gpt-realtime models.
- Determine whether input caching reduces costs for your repetitive prompts.
Models Under the Hood
as of 2026-07-17
Limitations
- The calculator relies on user-entered token estimates and does not track actual API usage.
- Pricing is based on published rates and may not reflect enterprise or volume discounts.
- It supports only OpenAI models, not other providers.
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