Gemini 3.1 Pro Preview Custom Tools alternatives
Models from providers other than Google, ranked by similarity to Gemini 3.1 Pro Preview Custom Tools — capability overlap, context window proximity, and per-million-token price. Refreshed nightly.
Frequently asked questions
What are the best alternatives to Gemini 3.1 Pro Preview Custom Tools?
The closest alternatives to Gemini 3.1 Pro Preview Custom Tools are GPT-5.4, Claude Sonnet 4.5 and Claude Sonnet 4.6. They are ranked by capability overlap, context-window similarity, and blended price.
Why might I switch from Gemini 3.1 Pro Preview Custom Tools?
Common reasons: reducing vendor lock-in, finding cheaper input/output pricing for your specific workload mix, or wanting capabilities Gemini 3.1 Pro Preview Custom Tools 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 Google with similar capabilities, comparable context window, and comparable per-million-token pricing. Same-provider variants (e.g. smaller siblings of Gemini 3.1 Pro Preview Custom Tools) are excluded — for those, use the cost calculator and compare pages.