AI API Cost Calculator
Enter your monthly token usage. Watch the models race in real time — and find out exactly which AI fits your budget in 2026.
Always verify at each provider’s official pricing page before budgeting.
AI API Cost Comparison Calculator (2026)
The AI API market in 2026 has never been more crowded — or cheaper. GPT-5.4, Claude Sonnet 4.6, Gemini 2.5 Flash, DeepSeek V4, and Grok 4.3 all compete for your token budget. But their pricing structures are complex: input vs output rates, caching discounts, batch APIs, and free tiers all affect your real monthly bill. This calculator cuts through the noise and tells you exactly what each model costs for your specific usage pattern.
How AI API Pricing Works in 2026
Every major AI provider bills by the token — a chunk of text roughly equal to ¾ of a word. Costs are quoted per million tokens (MTok) and split between input (what you send) and output (what the AI returns). Output tokens are typically 3–5× more expensive than input tokens, because generating text requires more compute than reading it.
Three factors can dramatically change your bill beyond the base rate:
- Prompt Caching — If your system prompt is long and stable, providers cache it server-side and charge only 10% of the normal input rate on cache hits. For chatbots and RAG pipelines, this alone can cut monthly bills by 50–70%.
- Batch API — OpenAI, Anthropic, and Google all offer asynchronous batch processing at 50% off for workloads that can wait up to 24 hours. Perfect for classification, summarization, or evaluation jobs.
- Free Tiers — Google’s Gemini still offers the most generous free daily request quota, making it ideal for prototyping before you start paying.
2026 AI API Pricing Reference Table
| Model | Provider | Input / MTok | Output / MTok | Tier |
|---|---|---|---|---|
| GPT-5.4 | OpenAI | $2.50 | $15.00 | Mid |
| GPT-4o mini | OpenAI | $0.15 | $0.60 | Budget |
| Claude Sonnet 4.6 | Anthropic | $3.00 | $15.00 | Mid |
| Claude Haiku 4.5 | Anthropic | $0.80 | $4.00 | Budget |
| Gemini 2.5 Pro | $2.00 | $12.00 | Mid | |
| Gemini 2.5 Flash | $0.30 | $2.50 | Budget | |
| DeepSeek V4 Flash | DeepSeek | $0.14 | $0.28 | Budget |
| Grok 4.3 | xAI | $0.20 | $0.50 | Budget |
Which AI Model Should You Use?
- Highest volume, budget priority: DeepSeek V4 Flash ($0.14/$0.28) or Gemini 2.5 Flash ($0.30/$2.50) are the cheapest capable options available today.
- Best quality-to-price balance: Claude Sonnet 4.6 and GPT-5.4 compete directly. Sonnet wins on context window (200K); GPT-5.4 has broader third-party integrations.
- Chatbots with long stable prompts: Enable prompt caching on any model. Anthropic and Google charge just 10% of base input rate on cache hits — the single biggest lever for reducing costs.
- Non-realtime pipelines (classification, eval, summarization): Always use Batch API for 50% off with no quality trade-off.
- Prototyping / testing: Google Gemini free tier or OpenAI starter credits. Don’t pay until you know your token volumes.
- Agentic / tool-use workloads: Claude Sonnet 4.6 and GPT-5.4 still lead on reliability for multi-step tool calling and coding agents.
Frequently Asked Questions
A token is roughly ¾ of a word in English. “Hello world” is 2 tokens. “Supercalifragilistic” is 4–6 tokens. Most providers use the same tokenization as OpenAI’s tiktoken library. 1,000 words ≈ 1,300–1,500 tokens. When budgeting, a simple chatbot message exchange (user + response) typically uses 200–800 tokens total.
Generating text token-by-token requires sequential GPU compute that can’t be parallelized the same way as reading input. Providers typically charge 3–5× more for output to reflect this asymmetry. This means heavy-generation tasks (long-form writing, code generation) cost disproportionately more than classification or summarization tasks.
At budget tier prices (Gemini Flash, DeepSeek): roughly $0.14–$0.30 per million input tokens. At mid-tier (Claude Sonnet, GPT-5.4): $2.50–$3.00 per million input. Output costs 3–5× more. For context, 1 million tokens is approximately 750,000 words — or a full novel and a half.
DeepSeek V4 Flash is genuinely among the cheapest capable models at $0.14/$0.28 per MTok. The trade-offs: data is processed on Chinese infrastructure (a concern for sensitive business data), latency can be higher for some regions, and agentic/tool-use reliability lags behind Claude and GPT on complex tasks. For pure text summarization or classification, it’s excellent value.
Yes — toggle “Apply prompt caching discount” above to model the ~90% reduction on cached input tokens (charged at 10% of base rate). This applies when you have a long, stable system prompt or RAG context that repeats across many requests. The calculator applies this to 70% of your input tokens as a conservative estimate.
Prices have been falling 30–50% per year since 2023 as providers release new model generations. Major price changes happen 2–3 times per year per provider, usually tied to a new model launch. We update this calculator regularly — the pricing table above reflects verified June 2026 rates.
Sources: OpenAI pricing page, Anthropic pricing page, Google AI Studio pricing, DeepSeek pricing, xAI API docs, aipricing.guru (verified June 15, 2026). This tool is for estimation only. Always confirm current rates with each provider before budgeting.