Claude Sonnet 4.6 vs GPT-5.3-Codex
Compare Claude Sonnet 4.6 by Anthropic against GPT-5.3-Codex by OpenAI, context windows of 1.0M vs 400K, tested across 53 shared challenges. Updated April 2026.
Which is better, Claude Sonnet 4.6 or GPT-5.3-Codex?
Claude Sonnet 4.6 and GPT-5.3-Codex are both competitive models. Claude Sonnet 4.6 costs $3/M input tokens vs $1.75/M for GPT-5.3-Codex. Context windows: 1000K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Sonnet 4.6 and GPT-5.3-Codex
Claude Sonnet 4.6 is made by anthropic while GPT-5.3-Codex is from openai. Claude Sonnet 4.6 has a 1000K token context window compared to GPT-5.3-Codex's 400K. On pricing, Claude Sonnet 4.6 costs $3/M input tokens vs $1.75/M for GPT-5.3-Codex.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
GPT-5.3-Codex uses 1.8x more lists
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
