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Provider Comparison

GPT-5.2 Codex with AGENTS.md vs GPT-4: AI Coding Evolution

Compare GPT-5.2 Codex with AGENTS.md support vs GPT-4. Agentic coding and project awareness.

Reviewed by Michael Kerkhoff, as of

Definition
GPT-5.2 Codex with AGENTS.md understands project conventions and coding standards from repository config. GPT-4 lacks this project-aware context.
Category
Provider Comparison
Options
GPT-5.2 Codex (AGENTS.md)GPT-4

Detailed Comparison

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

GPT-5.2 Codex (AGENTS.md) vs GPT-4
FactorGPT-5.2 Codex (AGENTS.md)GPT-4
Project AwarenessReads AGENTS.md for conventions and preferences WinnerNo project-level configuration awareness
Code Quality75 percent plus SWE-bench, superior code generation WinnerAround 50 percent SWE-bench, decent coding
Agentic CapabilitiesMulti-step tool use, file editing, terminal WinnerBasic function calling, no persistent tool use
CostPremium pricing for Codex tierLower cost, well-established Winner
MaturityNewer, rapidly evolvingBattle-tested, predictable Winner
Total Score · 0 ties3 / 52 / 5

Key Statistics

Real data from verified industry sources to support your decision.

  • AGENTS.md adoption growing rapidly across open-source — GitHub trends (2025)
  • GPT-5.2 Codex: 75 percent SWE-bench vs GPT-4: 50 percent — OpenAI benchmarks (2025)

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

When to Choose Each Option

Clear guidance based on your specific situation and needs.

Our Recommendation

GPT-5.2 Codex with AGENTS.md is a generational leap for agentic coding. GPT-4 requires manual context each session. For coding agents, GPT-5.2 Codex is the clear choice.

Choose GPT-5.2 Codex (AGENTS.md) when...
  • Need a generational leap in coding capabilities.
  • Focus on agentic coding tasks.
  • Prefer automated context management.
Choose GPT-4 when...
  • Prefer manual context management.
  • Focus on simpler coding tasks.
  • Need flexibility in coding sessions.

Need help deciding?

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