Claude Opus 4.8 vs GPT-4.5
Compare Claude Opus 4.8 by Anthropic against GPT-4.5 by OpenAI, context windows of 1.0M vs 128K, tested across 24 shared challenges. Updated May 2026.
Which is better, Claude Opus 4.8 or GPT-4.5?
Claude Opus 4.8 and GPT-4.5 are both competitive models. Claude Opus 4.8 costs $5/M input tokens vs $75/M for GPT-4.5. Context windows: 1000K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.8 and GPT-4.5
Claude Opus 4.8 is made by anthropic while GPT-4.5 is from openai. Claude Opus 4.8 has a 1000K token context window compared to GPT-4.5's 128K. On pricing, Claude Opus 4.8 costs $5/M input tokens vs $75/M for GPT-4.5.
Per 1M tokens
Claude Opus 4.8 is cheaper on both — 15× input, 6.0× output
No community votes yet. On paper, Claude Opus 4.8 has the edge — newer, bigger context window.
Claude Opus 4.8 is 6.0x cheaper per token — worth considering if cost matters.
Style Comparison
Claude Opus 4.8 uses 77.6x more emoji
