o1 alternatives
Models from providers other than OpenAI, ranked by similarity to o1 — capability overlap, context window proximity, and per-million-token price. Refreshed nightly.
Frequently asked questions
What are the best alternatives to o1?
The closest alternatives to o1 are Claude Opus 4.1, Claude Opus 4.5 and Claude Opus 4. They are ranked by capability overlap, context-window similarity, and blended price.
Why might I switch from o1?
Common reasons: reducing vendor lock-in, finding cheaper input/output pricing for your specific workload mix, or wanting capabilities o1 lacks (vision, tool use, JSON mode). Compare any two side-by-side from this page.
How is "alternative" defined here?
An alternative is a model from a different provider than OpenAI with similar capabilities, comparable context window, and comparable per-million-token pricing. Same-provider variants (e.g. smaller siblings of o1) are excluded — for those, use the cost calculator and compare pages.