Claude 3.7 Sonnet vs GPT-5.3-Codex
Compare Claude 3.7 Sonnet by Anthropic against GPT-5.3-Codex by OpenAI, context windows of 200K vs 400K, tested across 53 shared challenges. Updated May 2026.
Which is better, Claude 3.7 Sonnet or GPT-5.3-Codex?
Claude 3.7 Sonnet and GPT-5.3-Codex are both competitive models. Claude 3.7 Sonnet costs $3/M input tokens vs $1.75/M for GPT-5.3-Codex. Context windows: 200K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Claude 3.7 Sonnet and GPT-5.3-Codex
Claude 3.7 Sonnet is made by anthropic while GPT-5.3-Codex is from openai. Claude 3.7 Sonnet has a 200K token context window compared to GPT-5.3-Codex's 400K. On pricing, Claude 3.7 Sonnet costs $3/M input tokens vs $1.75/M for GPT-5.3-Codex.
Per 1M tokens
GPT-5.3-Codex is cheaper on both — 1.7× input, 1.1× output
No community votes yet. On paper, GPT-5.3-Codex has the edge — bigger model tier, newer, bigger context window.
Style Comparison
GPT-5.3-Codex uses 15.8x more emoji
