Cheap Claude Sonnet 4.5 API
Sonnet is Claude's everyday workhorse — close to Opus quality but noticeably faster and cheaper. It's the one you live in inside Cursor and Claude Code day to day, saving Opus for the really hard tasks. Through cheapai it's available via an OpenAI-compatible API from $0.70/1M per 1M tokens, roughly 77% cheaper than Anthropic's official price. No VPN, pay in ₽, USDT or by card, and it works out of the box with Cursor, Claude Code, Cline and any OpenAI SDK.
| Input / 1M | $0.70 |
| Output / 1M | $3.50 |
| Cache read / 1M | $0.07 |
| Cache write / 1M | $0.88 |
What it's good for
- agentic coding in Claude Code and Cursor
- refactoring and reviewing large codebases
- long documents and analysis up to 1M-token context
How to connect Claude Sonnet 4.5
- 1. Register and top up: cheapai.io/register
- 2. Create an API key: cheapai.io/keys
- 3. Point your tool to our API:
Base URL: https://cheapai.io/v1 API key: sk-... (from /keys) Model: claude-sonnet-4-5-20250929
Works with Cursor, Claude Code, Cline, Codex and any OpenAI-compatible SDK. Setup guides →
FAQ
How much does Claude Sonnet 4.5 cost via cheapai?
$0.70/1M per 1M tokens for input, $3.50/1M for output — about 77% below Anthropic's official price.
How do I connect Claude Sonnet 4.5?
Point your tool's base URL to https://cheapai.io/v1, create an API key at cheapai.io/keys, and use model "claude-sonnet-4-5-20250929". It works with Cursor, Claude Code, Cline and any OpenAI-compatible SDK.
Do I need a VPN?
No — cheapai works without a VPN and takes ₽, USDT and cards.