What are the best alternatives to OPT?

The top alternatives to OPT are Claude Fable 5, Gemini 3, Claude Opus 4.8, ranked by real usage data on Unfragile.

Are there free alternatives to OPT?

Yes, 10 free alternatives to OPT exist, including Llama 4, GPT-4o, Mistral Large.

Best Alternatives to OPT

20 alternatives ranked by real usage data. OPT scores 20/100 — 20 tools score higher.

OriginalOPT

Open Pretrained Transformers (OPT) by Facebook is a suite of decoder-only pre-trained transformers. [Announcement](https://ai.meta.com/blog/democratizing-access-to-large-scale-language-models-with-opt-175b/).

20 alternatives

10 free options

20 score higher

Claude Fable 595/100Higher rated

Anthropic's 2026 flagship — strongest Claude for agents, long-horizon coding, and tool orchestration.

Model

Best Alternatives to OPT

Company