AI LLM API Token Cost Calculator
Estimate your enterprise or programmatic infrastructure spend for 2026 locally on your device. Zero external API overhead.
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Projected Monthly Spend Comparison
Official Vendor Pricing (Unconfirmed API Token Rates)
For models without documented token rates in our fact sheet, token prices are not estimated. Confirm directly with the provider. Last reviewed: 12 October 2026.
| Model | Provider | Plan & Access Notes | Official Pricing |
|---|---|---|---|
| GPT-6 Sol | OpenAI | Plus, Pro, Business & Enterprise model (from 7 Oct 2026) | See official pricing → |
| GPT-6 Luna | OpenAI | Free and Go tier model (from 8 Oct 2026) | See official pricing → |
| Claude Opus 5.5 | Anthropic | Current frontier reasoning model; check Anthropic pricing | See official pricing → |
| Claude Sonnet 5.5 | Anthropic | Current flagship model; check Anthropic pricing | See official pricing → |
| Claude Haiku 5.5 | Anthropic | Current lightweight model; check Anthropic pricing | See official pricing → |
| Gemini 3.5 Flash-Lite | Free Gemini app tier model (from 9 Oct 2026) | See official pricing → | |
| Gemini 3.6 Flash | AI Plus and above tier model (shipped 21 July 2026) | See official pricing → |
About This LLM Cost Calculator
As of October 2026, the foundational AI model landscape features current architectures like GPT-6 Sol, Claude Sonnet 5.5, and Gemini 3.5 Flash-Lite. For software developers and enterprise engineering teams, estimating API token costs before deploying an AI feature to production is critical.
This free token cost calculator provides a local, instant, and privacy-friendly way to project your monthly spend across the top three foundational model providers: OpenAI, Anthropic, and Google. By adjusting your expected monthly request volume, the average length of your prompts, and your input-to-output token ratio, you can see a realistic side-by-side comparison of projected programmatic costs.
How Costs Are Calculated
To provide a realistic estimate, this calculator converts your estimated "words" into "tokens." Tokenizers differ between providers, so real token counts will vary. A standard industry rule of thumb is that 1 word equals approximately 1.33 tokens. 'Avg words per prompt' means total words per request (input plus output). The input/output split divides that total into tokens. The calculator multiplies your expected words per prompt by this ratio, factors in your designated input vs. output split, and multiplies the result by the per-million-token rate as reported from each provider.
2026 Pricing Sources & Assumptions
Information last reviewed: 12 October 2026
- OpenAI Pricing: Rates are based on OpenAI's published API reporting. GPT-6 Astra is modeled at $10.00/1M input tokens and $50.00/1M output tokens (as reported, confirm on vendor site).
- Anthropic Pricing: Rates reflect Anthropic's published reporting. Claude Fable 5.1 is calculated at $10.00/1M input and $50.00/1M output (as reported, confirm on vendor site).
- Google Gemini Pricing: Rates are sourced from Google AI Studio and official Gemini API documentation.
Sources
- OpenAI: https://openai.com/api/pricing
- Anthropic: https://claude.com/pricing (API tab)
- Google: https://ai.google.dev/gemini-api/docs/pricing
- Information last reviewed: 12 October 2026
Disclaimer: This tool provides estimates for budgetary planning purposes only. Prices change often. This calculator is an estimate, not a quote. All calculations are performed locally in your browser. Actual billed amounts will vary based on exact tokenization, cached context hits, batching, and regional tax variations. Always consult the official pricing pages of OpenAI, Anthropic, and Google Cloud before finalizing your infrastructure budgets.