Cheapest GPT-5.6 Sol API: XCLI is 97% below the official price
GPT-5.6 Sol costs $4.00/$20.00 per 1M tokens from OpenAI. The lowest quote in the index is XCLI: $0.110 in, $0.660 out. Full table and buying checklist below.
| # | Provider | 1M input | 1M output | vs list | Tokens per $100 |
|---|---|---|---|---|---|
| — | Official list | $4.00 | $20.00 | 0% | 15.0M |
| 1 | $0.110 | $0.660 | −97% | 496M | |
| 2 | $0.300 | $1.80 | −92% | 182M | |
| 3 | $0.400 | $2.00 | −90% | 150M | |
| 4 | $0.440 | $2.20 | −89% | 136M | |
| 5 | $0.750 | $4.50 | −79% | 72.7M | |
| 6 | $0.750 | $4.50 | −79% | 72.7M | |
| 7 | $0.750 | $4.50 | −79% | 72.7M | |
| 8 | $1.28 | $6.40 | −68% | 46.9M |
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.