Compare GPT-5.4 by OpenAI against Grok 4.20 Multi-Agent Beta by xAI, context windows of 1.1M vs 2.0M, tested across 53 shared challenges. Updated April 2026.
GPT-5.4 and Grok 4.20 Multi-Agent Beta are both competitive models. GPT-5.4 costs $2.5/M input tokens vs $2/M for Grok 4.20 Multi-Agent Beta. Context windows: 1050K vs 2000K tokens. Compare their real outputs side by side below.
GPT-5.4 is made by openai while Grok 4.20 Multi-Agent Beta is from xai. GPT-5.4 has a 1050K token context window compared to Grok 4.20 Multi-Agent Beta's 2000K. On pricing, GPT-5.4 costs $2.5/M input tokens vs $2/M for Grok 4.20 Multi-Agent Beta.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT-5.4 uses 7.0x more headings
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 GPT-5.4 by OpenAI against Grok 4.20 Multi-Agent Beta by xAI, context windows of 1.1M vs 2.0M, tested across 53 shared challenges. Updated April 2026.
GPT-5.4 and Grok 4.20 Multi-Agent Beta are both competitive models. GPT-5.4 costs $2.5/M input tokens vs $2/M for Grok 4.20 Multi-Agent Beta. Context windows: 1050K vs 2000K tokens. Compare their real outputs side by side below.
GPT-5.4 is made by openai while Grok 4.20 Multi-Agent Beta is from xai. GPT-5.4 has a 1050K token context window compared to Grok 4.20 Multi-Agent Beta's 2000K. On pricing, GPT-5.4 costs $2.5/M input tokens vs $2/M for Grok 4.20 Multi-Agent Beta.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT-5.4 uses 7.0x more headings
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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48 fights queued
36+ 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