InferIndex · https://inferindex.dev/en/compare/qwen/qwen3.5-plus/vs/upstage/solar-pro4
Qwen3.5 Plus costs from $0.258 per million tokens at a 3:1 input:output mix: the cheapest price. Solar Pro 4 costs from $0.053, the cheapest price without a flag. Prices checked on .
Verdict
At these prices, Qwen3.5 Plus costs 4.9× as much as Solar Pro 4 per million tokens (at a 3:1 input:output mix).
Each model's lowest blended price, per 1M tokens, across every provider we track.
| Model | Lowest blended price, $ per 1M tokens. Green background: the most favourable value of each column. | Input price of the cheapest offer, per 1M tokens | Output price of the cheapest offer, per 1M tokens | The provider's published policy says the text you send is not used to train models. We only show what is published; we can't check it ourselves. | For 2,000 input tokens and 500 output tokens per request, 1,000 requests a day, at the cheapest offer for that workload. Change the workload above. | Offers | Providers | The maximum amount of text, counted in tokens, the model can take in and write in a single request. Past this limit, the request is refused or cut. | Observation |
|---|---|---|---|---|---|---|---|---|---|
| Most expensive offer · $0.90. The highest blended price among comparable offers: one price per provider (its cheapest route), standard tier, current prices only. Priority tiers and prices converted from points are not counted. Green background: the most favourable value of each column., most favourable value of the column | $0.115, most favourable value of the column | $0.688 | at Vercel AI Gateway | $17.22, most favourable value of the columnat Alibaba | 11 | 9, most favourable value of the column | – | Cheapest. Lowest blended price, $ per 1M tokens | |
| $0.263 | $0.15 | $0.60, most favourable value of the column | at NanoGPT, most favourable value of the column | $18.00at Upstage via OpenRouter | 6 | 5 | 524k |
Green background: the most favourable value of each column.
Prices as of Oct 30, 2026, 7:09 PM UTCSame rules as the API's /cheapest route. The monthly estimate uses the cheapest offer for that workload.