Cheapest Claude Opus 4.5 API: Clidex is 91% below the official price
Claude Opus 4.5 costs $5.00/$25.00 per 1M tokens from Anthropic. The lowest quote in the index is Clidex: $0.450 in, $2.25 out. Full table and buying checklist below.
| # | Provider | 1M input | 1M output | vs list | Tokens per $100 |
|---|---|---|---|---|---|
| — | Official list | $5.00 | $25.00 | 0% | 12.0M |
| 1 | $0.450 | $2.25 | −91% | 133M | |
| 2 | $0.450 | $2.25 | −91% | 133M | |
| 3 | $0.750 | $3.75 | −85% | 80.0M | |
| 4 | $0.750 | $3.75 | −85% | 80.0M | |
| 5 | $1.60 | $8.00 | −68% | 37.5M | |
| 6 | $5.00 | $25.00 | 0% | 12.0M | |
| 7 | $7.35 | $36.75 | +47% | 8.16M |
Scroll the table sideways to see every price.
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.