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Open source alternatives to GPT-5.3-Codex

2 open source tools do the job of GPT-5.3-Codex. About GPT-5.3-Codex

GPT-5.3-Codex homepage
GPT-5.3-CodexPaid
GLM-4.7 homepage
GLM-4.7MITCode

All 2 alternatives

Questions about alternatives to GPT-5.3-Codex

What is the best open source alternative to GPT-5.3-Codex?

GLM-4.7 is listed first. Choose GLM-4.7 when coding agents need open weights, or a free Flash tier on Z.ai's API, instead of OpenAI's Codex model.

Is there a free alternative to GPT-5.3-Codex?

Yes. The code of all 2 is public under MIT or OpenMDW 1.1, so you can use them with no licence fee. Running one yourself costs the server and your time to look after it, and some makers also sell a hosted plan.

How do I choose between them?

Start from the job you use GPT-5.3-Codex for. Choose Laguna S 2.1 when you want an Apache-licensed coding model with 8B active parameters and a 1M context to self-host.

Which GPT-5.3-Codex alternatives can I host on my own server?

All 2: GLM-4.7 and Laguna S 2.1. Each tool's page says what it needs to run.

What licences do they use?

MIT (1), OpenMDW 1.1 (1). MIT, BSD and Apache let you change and reuse the code freely.

What do I lose by leaving GPT-5.3-Codex?

The hosting. GPT-5.3-Codex's maker runs the servers for you; with an open source tool the updates, backups, security fixes and support are yours, unless you take the maker's hosted plan. Features differ too, so check what each one imports and exports before you move your data.