GPT-5.4 Pro vs GPT-5.5
Compare GPT-5.4 Pro and GPT-5.5, both from OpenAI, context windows of 1.1M vs 1.1M, tested across 18 shared challenges. Updated May 2026.
Which is better, GPT-5.4 Pro or GPT-5.5?
GPT-5.4 Pro and GPT-5.5 are both competitive models. GPT-5.4 Pro costs $30/M input tokens vs $5/M for GPT-5.5. Context windows: 1050K vs 1050K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.4 Pro and GPT-5.5
GPT-5.4 Pro is made by openai while GPT-5.5 is from openai. GPT-5.4 Pro has a 1050K token context window compared to GPT-5.5's 1050K. On pricing, GPT-5.4 Pro costs $30/M input tokens vs $5/M for GPT-5.5.
Per 1M tokens
GPT-5.5 is cheaper on both — 6.0× input, 6.0× output
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT-5.5 is 6.0x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-5.5 uses 3.4x more transitions
