Compare ChatGPT-4o (March 2025) by OpenAI against Solar Pro 3 by Upstage, context windows of 128K vs 128K, tested across 24 shared challenges. Updated April 2026.
ChatGPT-4o (March 2025) and Solar Pro 3 are both competitive models. ChatGPT-4o (March 2025) costs $5/M input tokens vs $0/M for Solar Pro 3. Context windows: 128K vs 128K tokens. Compare their real outputs side by side below.
ChatGPT-4o (March 2025) is made by openai while Solar Pro 3 is from upstage. ChatGPT-4o (March 2025) has a 128K token context window compared to Solar Pro 3's 128K. On pricing, ChatGPT-4o (March 2025) costs $5/M input tokens vs $0/M for Solar Pro 3.
No community votes yet. On paper, ChatGPT-4o (March 2025) has the edge — bigger model tier, major provider backing.
ChatGPT-4o (March 2025) uses 5.4x more emoji
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 ChatGPT-4o (March 2025) by OpenAI against Solar Pro 3 by Upstage, context windows of 128K vs 128K, tested across 24 shared challenges. Updated April 2026.
ChatGPT-4o (March 2025) and Solar Pro 3 are both competitive models. ChatGPT-4o (March 2025) costs $5/M input tokens vs $0/M for Solar Pro 3. Context windows: 128K vs 128K tokens. Compare their real outputs side by side below.
ChatGPT-4o (March 2025) is made by openai while Solar Pro 3 is from upstage. ChatGPT-4o (March 2025) has a 128K token context window compared to Solar Pro 3's 128K. On pricing, ChatGPT-4o (March 2025) costs $5/M input tokens vs $0/M for Solar Pro 3.
No community votes yet. On paper, ChatGPT-4o (March 2025) has the edge — bigger model tier, major provider backing.
ChatGPT-4o (March 2025) uses 5.4x more emoji
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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19 fights queued
7+ more head-to-head results. Free. Not a trick.
Free account. No card required. By continuing, you agree to Rival's Terms and Privacy Policy