Codex (OpenAI) vs Microsoft Agent Framework 1.0
Which one should you pick? Here's the full breakdown.
Codex (OpenAI)
OpenAI's cloud-based coding agent -- runs parallel tasks, proposes PRs, and lives inside ChatGPT
Powered by GPT-5.3-Codex / GPT-5.4
Microsoft Agent Framework 1.0
Microsoft's MIT-licensed open-source agent orchestration framework -- GA on 2026-04-03. Merges Semantic Kernel and AutoGen into a single SDK. Python and .NET. Native MCP and A2A protocol support. Connectors for Foundry, Azure OpenAI, OpenAI, Claude, Bedrock, Gemini, Ollama
| Category | Codex (OpenAI) | Microsoft Agent Framework 1.0 |
|---|---|---|
| Ease of Use | 8.0 | 6.0 |
| Output Quality | 8.0 | 8.5 |
| Value | 8.0 | 10.0 |
| Features | 9.0 | 9.0 |
| Overall | 8.3 | 8.4 |
Pricing Comparison
| Feature | Codex (OpenAI) | Microsoft Agent Framework 1.0 |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Benchmark Head-to-Head
GPT-5.3-Codex benchmarks — Microsoft Agent Framework 1.0 has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| SWE-bench | Real GitHub issue fixing | 72% |
| HumanEval | Python code generation | 95% |
Which Should You Pick?
Pick Codex (OpenAI) if...
- ✓Easier to use (8 vs 6)
Developers already paying for ChatGPT Plus who want a coding agent at no extra cost. Especially good for parallel task execution -- assign multiple bug fixes or feature branches and let Codex work them simultaneously.
Visit Codex (OpenAI)Pick Microsoft Agent Framework 1.0 if...
- ✓Better value for money (10/10)
Enterprise developers on .NET or mixed Python + .NET stacks who want an MIT-licensed agent orchestration framework with real enterprise credibility. Also good for Azure Foundry customers who want first-class native integration. Teams migrating from Semantic Kernel or AutoGen should plan the move to Microsoft Agent Framework 1.0 now rather than later.
Visit Microsoft Agent Framework 1.0Our Verdict
Codex (OpenAI) and Microsoft Agent Framework 1.0 are extremely close overall. Your choice comes down to specific needs -- Codex (OpenAI) is better for developers already paying for chatgpt plus who want a coding agent at no extra cost, while Microsoft Agent Framework 1.0 works best for enterprise developers on .