Compare AI API costs across every major LLM
AI Prompt Cost Calculator is a free, browser-based tool that lets you compare ai api costs across every major llm — with zero signup, zero installation. Your data never leaves your browser. Part of 67+ free developer and business tools at wowhow.cloud, built and maintained by a team with 14+ years of hands-on development experience.
Input Tokens
49
Output Tokens
500
Total Tokens
549
How many tokens the AI generates in response
For monthly cost projection
GPT-4o Mini
$0.0003 per call / $0.922 per month
99% cheaper than the most expensive option
| # | Model | Input $/1M | Output $/1M | Per Call | Monthly |
|---|---|---|---|---|---|
| 1 | ECO GPT-4o MiniCHEAPEST OpenAI | $0.15 | $0.6 | $0.0003 | $0.922 |
| 2 | ECO Gemini 3.1 Flash-Lite | $0.25 | $1.5 | $0.0008 | $2.29 |
| 3 | ECO Gemini 3.1 Flash | $0.75 | $3 | $0.0015 | $4.61 |
| 4 | ECO Claude Haiku 4.5 Anthropic | $1 | $5 | $0.0025 | $7.65 |
| 5 | MID GPT-4o OpenAI | $2.5 | $10 | $0.0051 | $15.37 |
| 6 | MID Gemini 3.1 Pro | $2 | $12 | $0.0061 | $18.29 |
| 7 | MID Claude Sonnet 4.6 Anthropic | $3 | $15 | $0.0076 | $22.94 |
| 8 | PRO GPT-5 OpenAI | $15 | $60 | $0.031 | $92.20 |
| 9 | PRO Claude Opus 4.6 Anthropic | $15 | $75 | $0.038 | $114.7 |
Highest intelligence, complex reasoning
Avg. monthly cost
$103.45
Strong performance, reasonable cost
Avg. monthly cost
$18.87
Fast and affordable for simple tasks
Avg. monthly cost
$3.87
Per 1M tokens. Prices from official provider pricing pages.
| Model | Provider | Input $/1M | Output $/1M | Output/Input Ratio |
|---|---|---|---|---|
| Claude Opus 4.6 | Anthropic | $15 | $75 | 5.0x |
| GPT-5 | OpenAI | $15 | $60 | 4.0x |
| Claude Sonnet 4.6 | Anthropic | $3 | $15 | 5.0x |
| GPT-4o | OpenAI | $2.5 | $10 | 4.0x |
| Gemini 3.1 Pro | $2 | $12 | 6.0x | |
| Claude Haiku 4.5 | Anthropic | $1 | $5 | 5.0x |
| Gemini 3.1 Flash | $0.75 | $3 | 4.0x | |
| Gemini 3.1 Flash-Lite | $0.25 | $1.5 | 6.0x | |
| GPT-4o Mini | OpenAI | $0.15 | $0.6 | 4.0x |
Paste your prompt or system message into the text area to estimate input tokens
Set the expected output length using the slider (100-4000 tokens)
Set your expected API calls per day for monthly cost projection
Compare costs across 9 major AI models sorted by price, tier, or monthly spend
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