Last updated: April 5, 2026 · Reviewed by Daniel Ashford
👑Claude Opus 4 vs 🔥GPT-5.3 Codex
Head-to-head across 6 dimensions · by Daniel Ashford
Summary
Claude Opus 4 leads overall with an Index of 96.0 vs 95.2. Claude Opus 4 wins on accuracy, reasoning, safety, creativity. GPT-5.3 Codex wins on coding, instruction. On pricing, GPT-5.3 Codex is more affordable.
❓ Frequently Asked Questions
Is Claude Opus 4 better than GPT-5.3 Codex?
Based on the LLM Judge Index™, Claude Opus 4 scores higher overall (96.0 vs 95.2). Claude Opus 4 leads on accuracy, reasoning, safety, creativity, while GPT-5.3 Codex leads on coding, instruction.
Which is cheaper, Claude Opus 4 or GPT-5.3 Codex?
GPT-5.3 Codex is more affordable at $10/M tokens.
Which is better for coding?
GPT-5.3 Codex scores higher on coding (97 vs 94).
Which model is safer?
Claude Opus 4 has a higher safety score (98 vs 93).