What is the difference between GPT-5.4 and Claude Opus 4.1?

GPT-5.4 is developed by OpenAI while Claude Opus 4.1 is developed by Anthropic. GPT-5.4 has a 1.1M token context window vs Claude Opus 4.1's 200K. You can compare their actual outputs across 26 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.4 or Claude Opus 4.1?

It depends on your use case. GPT-5.4 and Claude Opus 4.1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 26 challenges so you can judge which fits your needs best.

How much does GPT-5.4 cost compared to Claude Opus 4.1?

GPT-5.4 costs $2.5/M input tokens and Claude Opus 4.1 costs $15/M input tokens. GPT-5.4 is $12.50/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare GPT-5.4 and Claude Opus 4.1 on Rival?

This page shows a side-by-side comparison of GPT-5.4 and Claude Opus 4.1 across shared challenges. You can vote on which model produced the better output, and Pro users can create custom challenges to test both models with their own prompts.