Cheapest Claude Sonnet 4.5 API: Clidex is 91% below the official price
Claude Sonnet 4.5 costs $3.00/$15 per 1M tokens from Anthropic. The cheapest quote is Clidex: $0.270 in, $1.35 out. Full table and buying checklist below.
| # | Provider | 1M input | 1M output | Discount | Tokens per $100 |
|---|---|---|---|---|---|
| — | Official list | $3.00 | $15.00 | 0% | 20.0M |
| 1 | $0.270 | $1.35 | −91% | 222M | |
| 2 | $0.270 | $1.35 | −91% | 222M | |
| 3 | $0.450 | $2.25 | −85% | 133M | |
| 4 | $0.450 | $2.25 | −85% | 133M | |
| 5 | $4.41 | $22.03 | — | 13.6M | |
| 6 | $11.25 | $56.25 | — | 5.33M |
Tokens per $100 assume a “code” mix: 5 input tokens per output token. Prices are crawled; verify them on the provider page before buying.
What to check before buying
- Test the key with the free API checker — it verifies the endpoint responds, without sending tokens.
- Compare the blended cost for your workload, not just the input price: output tokens dominate in agent workloads.
- Check uptime and minimum top-up: the cheapest provider is useless if it is down half the day.