OpenAI gpt-oss-120b vs Upstage Solar Pro 4
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Both cost about the same at a typical 3:1 input/output mix.
- Solar Pro 4 accepts longer prompts: 524K vs 131K tokens.
- gpt-oss-120b output costs $0.15 per 1M via Near AI, against the list price of $0.60.
- Solar Pro 4 is the newer model (released 2026-08-10).
| gpt-oss-120b | Solar Pro 4 | |
|---|---|---|
| Vendor | OpenAI | Upstage |
| Released | 2025-08-05 | 2026-08-10 |
| Input / 1M | $0.15 | $0.15 |
| Output / 1M | $0.60 | $0.60 |
| Cached input / 1M | $0.075 | $0.03 |
| Blended / 1M (3:1) | $0.262 | $0.262 |
| Context | 131K | 524K |
| Max output | 66K | 131K |
| Accepts | text | text |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 25 | 2 |
| Cheapest provider, output | $0.15 | $0.60 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | — |
Cost calculator
gpt-oss-120b
$18.00 per month$0.60 per day
Solar Pro 4
$18.00 per month$0.60 per day
At list prices per 1M tokens; prompt caching and batch discounts are not included.
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