# Show HN: CostPerPrompt – Live AI API pricing and real-workload cost calculators

> Source: <https://costperprompt.com/>
> Published: 2026-08-02 01:56:44+00:00

# What will AI actually cost you?

Live pricing for 232+ models, refreshed automatically — plus calculators that turn token prices into real answers: what your chatbot, agent, or API workload will cost per month.

## Every cost question, answered

[$_ API Cost Calculator Any workload, compared across all 232 models — with caching & batch discounts.](/api-cost-calculator)

[💬 Chatbot Cost Simulates real conversations — growing history, resent context, cache hits.](/chatbot-cost-calculator)

[🤖 Agent Cost Multi-step loops, tool schemas, retries — see why agents cost 10–30× more than you think.](/agent-cost-calculator)

[📚 RAG Cost Indexing, retrieval and generation priced separately — spoiler: embeddings are pennies.](/rag-cost-calculator)

[🎙️ Voice AI Cost STT + LLM + TTS per minute, per call, per month — the full three-part bill.](/voice-ai-cost-calculator)

[🖥️ GPU Rental Pricing H100, A100, RTX 4090 across 10 providers — the same chip at a 5× price spread.](/gpu-rental-pricing)

[🖼️ Image API Pricing $0.003 to $0.17 per image — three market tiers and a batch calculator.](/image-api-pricing)

[🔢 Token Counter Paste text, get tokens and cost on any model — 100% in your browser.](/token-counter)

[⚡ Cost-Cutting Guides Prompt caching (−90% input) and the Batch API (−50% everything) explained.](/guides/prompt-caching)

## Flagship model pricing

per 1M tokens · updated 2026-08-02| Model | Vendor | Input / 1M | Output / 1M | Context |
|---|---|---|---|---|
|
|

[GPT-5.5](/models/openai-gpt-5-5)[GPT-5.4](/models/openai-gpt-5-4)[Claude Fable 5](/models/anthropic-claude-fable-5)[Claude Opus 5](/models/anthropic-claude-opus-5)[Claude Sonnet 5](/models/anthropic-claude-sonnet-5)[Kimi K3](/models/moonshotai-kimi-k3)[DeepSeek V4 Pro](/models/deepseek-deepseek-v4-pro)[DeepSeek V4 Flash 0731](/models/deepseek-deepseek-v4-flash-0731)[Gemini 3.1 Pro Preview](/models/google-gemini-3-1-pro-preview)[Gemini 3.6 Flash](/models/google-gemini-3-6-flash)[Grok 4.5](/models/x-ai-grok-4-5)[Grok 4.3](/models/x-ai-grok-4-3)[GLM 5.2](/models/z-ai-glm-5-2)## How AI API pricing works — the 60-second version

Every major AI provider bills the same way: you pay per **token** (roughly ¾ of
a word), with separate rates for **input** (what you send) and
**output** (what the model writes back). Output is usually 3–5× more expensive
than input. A model listed at $5 / $25 per million tokens costs $5 for every million tokens
you send and $25 for every million it generates.

Two discounts change the math dramatically: **prompt caching** cuts repeated
input costs by up to 90% (critical for chatbots that resend conversation history), and
**batch processing** takes ~50% off when you can wait for results. Our
calculators account for both — most "how much will this cost" articles don't, which is why
their estimates run 2–3× too high or too low.