Compare Grok 3 Mini Beta by xAI against Solar Pro 3 by Upstage, context windows of 131K vs 128K, tested across 8 shared challenges. Updated April 2026.
Grok 3 Mini Beta and Solar Pro 3 are both competitive models. Grok 3 Mini Beta costs $0.4/M input tokens vs $0/M for Solar Pro 3. Context windows: 131K vs 128K tokens. Compare their real outputs side by side below.
Grok 3 Mini Beta is made by xai while Solar Pro 3 is from upstage. Grok 3 Mini Beta has a 131K token context window compared to Solar Pro 3's 128K. On pricing, Grok 3 Mini Beta costs $0.4/M input tokens vs $0/M for Solar Pro 3.
No community votes yet. On paper, Solar Pro 3 has the edge — bigger model tier, newer.
Ask them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.

Compare Grok 3 Mini Beta by xAI against Solar Pro 3 by Upstage, context windows of 131K vs 128K, tested across 8 shared challenges. Updated April 2026.
Grok 3 Mini Beta and Solar Pro 3 are both competitive models. Grok 3 Mini Beta costs $0.4/M input tokens vs $0/M for Solar Pro 3. Context windows: 131K vs 128K tokens. Compare their real outputs side by side below.
Grok 3 Mini Beta is made by xai while Solar Pro 3 is from upstage. Grok 3 Mini Beta has a 131K token context window compared to Solar Pro 3's 128K. On pricing, Grok 3 Mini Beta costs $0.4/M input tokens vs $0/M for Solar Pro 3.
No community votes yet. On paper, Solar Pro 3 has the edge — bigger model tier, newer.
Ask them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.

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