Compare Solar Pro 3 from upstage and Grok 4.1 Fast from SpaceXAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
Solar Pro 3 and Grok 4.1 Fast are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Solar Pro 3, from upstage, has a 131,072-token context window and is priced at $0.15/M tokens input, $0.60/M tokens output on OpenRouter.
Grok 4.1 Fast, from SpaceXAI, has a 2,000,000-token context window and is priced by the provider serving it on OpenRouter.
| Solar Pro 3 | Grok 4.1 Fast | |
|---|---|---|
| Input price | $0.15/M tokens | Pricing varies by provider |
| Output price | $0.60/M tokens | Pricing varies by provider |
| Context window | 131,072 tokens | 2,000,000 tokens |
| Intelligence Index | 7.8 | Not available |
| Coding Index | 16.2 | Not available |
| Agentic Index | 1.4 | Not available |
| Latency (p50) | 1.06 s | Not available |
| Throughput (p50) | 120.5 tok/s | Not available |
Grok 4.1 Fast has the longer context window at 2,000,000 tokens, compared with 131,072 tokens for Solar Pro 3.