Technology

GPT-5.2 Codex vs GPT-4 Codex: AI Coding Comparison 2026

Compare GPT-5.2 Codex and GPT-4 Codex — benchmarks, context windows, and coding performance.

Updated on February 20, 2026

Reviewed by Michael Kerkhoff, as of February 20, 2026

Definition: OpenAI's Codex evolved from GPT-4 (32K context) to GPT-5.2 (400K context, 56.4% SWE-bench Pro). This comparison covers code generation, reasoning, cost, and ecosystem.
Category: Technology
Options: GPT-5.2 CodexGPT-4 Codex

Detailed Comparison

A side-by-side analysis of key factors to help you make the right choice.

Real data from verified industry sources to support your decision.

All statistics come from verified third-party sources. Source, year, and direct link are shown on each metric.

Clear guidance based on your specific situation and needs.

Our Recommendation

GPT-5.2 Codex dominates with 400K context and 56.4% SWE-bench Pro. GPT-4 Codex suits only budget-constrained simple tasks.

Choose GPT-5.2 Codex when...: Need extensive context for complex tasks.
Focus on high-performance coding.
Prefer the latest technology.
Choose GPT-4 Codex when...: Budget constraints limit advanced features.
Focus on simple coding tasks.
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