Claude 2 vs GPT-5.1-Codex
Compare Claude 2 by Anthropic against GPT-5.1-Codex by OpenAI, context windows of 100K vs 400K, tested across 5 shared challenges. Updated April 2026.
Which is better, Claude 2 or GPT-5.1-Codex?
Claude 2 and GPT-5.1-Codex are both competitive models. Claude 2 costs $11.02/M input tokens vs $1.25/M for GPT-5.1-Codex. Context windows: 100K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Claude 2 and GPT-5.1-Codex
Claude 2 is made by anthropic while GPT-5.1-Codex is from openai. Claude 2 has a 100K token context window compared to GPT-5.1-Codex's 400K. On pricing, Claude 2 costs $11.02/M input tokens vs $1.25/M for GPT-5.1-Codex.
No community votes yet. On paper, GPT-5.1-Codex has the edge — bigger model tier, newer, bigger context window.
GPT-5.1-Codex is 3.3x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-5.1-Codex uses 39.1x more hedging
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.
