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Open source alternatives to GPT-5.5

3 open source tools do the job of GPT-5.5. About GPT-5.5

GPT-5.5 homepage
GPT-5.5Paid
Command A+ homepage
Command A+Apache 2.0Code

All 3 alternatives

Questions about alternatives to GPT-5.5

What is the best open source alternative to GPT-5.5?

Command A+ is listed first. Choose Command A+ when you want an enterprise agent model with image input that you can download and run under Apache 2.0.

Is there a free alternative to GPT-5.5?

Yes. The code of all 3 is public under Apache 2.0 or MIT, 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-5.5 for. Choose DeepSeek-V3.2-Speciale when you want a high-compute reasoning model for competition-level problems that you can run and study yourself. Choose DeepSeek V4 Pro when long agentic coding jobs need open weights, or DeepSeek's own API with off-peak rates.

Which GPT-5.5 alternatives can I host on my own server?

All 3: Command A+, DeepSeek V4 Pro and DeepSeek-V3.2-Speciale. Each tool's page says what it needs to run.

What licences do they use?

MIT (2), Apache 2.0 (1). MIT, BSD and Apache let you change and reuse the code freely.

What do I lose by leaving GPT-5.5?

The hosting. GPT-5.5'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.