Best Alternatives to Gemini 3.1 Pro Preview Custom Tools (2026)
Looking for an alternative to Gemini 3.1 Pro Preview Custom Tools by Google? Here are the top 10 alternatives ranked by our composite scoring system across benchmarks, community sentiment, pricing, and adoption data.
Score
By our composite score, the top-ranked alternative is GPT-5.6 Luna Pro by OpenAI at 88 (-4 vs Gemini 3.1 Pro Preview Custom Tools's 92). Of the 10 alternatives here, 0 score higher than Gemini 3.1 Pro Preview Custom Tools.
Among the priced alternatives, GPT-5.6 Luna Pro has the lowest output cost at $0.60 per million tokens (95% cheaper than Gemini 3.1 Pro Preview Custom Tools).
GPT-5.6 Luna Pro has the largest context window among these alternatives at 1.1M tokens, suited to long documents and large codebases.
Why Consider Alternatives to Gemini 3.1 Pro Preview Custom Tools?
Among the 10 closest llm alternatives to Gemini 3.1 Pro Preview Custom Tools (composite score 92), 0 score higher. 10 cost less per token, and the lowest-priced is GPT-5.6 Luna Pro at $0.60 per million output tokens. Each card below breaks down how the alternative differs from Gemini 3.1 Pro Preview Custom Tools on price, context window, and capabilities.
Our rankings evaluate each model across multiple signals updated hourly, so you can be confident these recommendations reflect the latest performance data. Browse the full LLM rankings or use our pricing comparison tool to find the best fit for your budget.