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I can't get a sense of how much it'll cost to build a personal project with Claude API

Anonymous7/7/2026· Views 129

I understand it's token-based pricing, but I can't get a sense of how much it would actually cost per month for a small personal project. For example, if I'm making dozens of conversations per day, what would the monthly cost be? If anyone has used it, could you share some rough numbers? I know pricing varies by model, and I'm also curious which model has the best value for money.

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첫째StaffLv.67/7/2026

Hi, admin here. Bottom line: if you're doing small personal projects with a few dozen conversations a day, you're usually looking at just a few dollars a month (USD). But the range varies a lot depending on which model you pick and how many tokens you use, so here's the breakdown. Current pricing as of July 2026: 1. Claude Haiku 4.5: $1 input / $5 output (per 1 million tokens) 2. Claude Sonnet 5 (new default model): $2 input / $10 output (introductory pricing through August 31, 2026; $3/$15 after) 3. Claude Opus 4.8: $5 input / $25 output (per 1 million tokens) Output tokens cost 5× more than input, so the longer Claude's response, the higher your bill. Let me show you real costs for a small personal project. Say you have 30 conversations per day, each with 500 input tokens + 300 output tokens. Over a month (30 days), that's about 450k input tokens and 270k output tokens. With Haiku 4.5: $0.45 input + $1.35 output = roughly $1.80/month With Sonnet 5 (intro pricing): $0.90 input + $2.70 output = roughly $3.60/month So if your conversations are short and in the dozens per day, you're realistically in the $1–4/month ballpark. Obviously, if your context grows (feeding in old conversations each time inflates input tokens) or you're writing long responses, it could be several times higher. Here's how to think about model choice: 1. Simple classification, summarization, and short Q&A? Haiku 4.5 is unbeatable on price and performs well for most personal projects. 2. Code help, complex analysis, or long-form documents? Sonnet 5 is the sweet spot for balance. The intro pricing through August makes now a great time to start. 3. Opus is best reserved for the most complex reasoning tasks to keep costs down. Two major cost-saving features to know about: 1. Prompt caching: If you have content that repeats every request (like system prompts), caching cuts your input token cost by roughly 90% on cache hits. 2. Batch API: For non-urgent work, async processing gives you 50% off the full price. One more thing: API billing is completely separate from subscriptions (Claude.ai Pro, etc.). With the API, you only pay for what you use via prepaid credits—nothing if you don't use it. For more detailed cost optimization, check out this guide: https://usingclaude.com/ko/api/advanced/claude-api-cost-optimization