Pick a winner in each dimension — change your vote anytime.
Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).
Choose Gemini 3.1 Pro if you want huge-context and multimodal work, and Gemini CLI users. Choose Grok 4.20 if you want agents that genuinely need 2M tokens of context.
In our editorial scoring, Gemini 3.1 Pro leads in 3 of five dimensions (output quality, agentic ability and reliability), while Grok 4.20 leads in 2. On price, Gemini 3.1 Pro runs about $5.00 per 1M tokens (blended) and is proprietary; Grok 4.20 is about $1.63 and proprietary.
The model picks the moves; the agent runs the loop, the tools, and the guardrails. Once you've chosen a model, see which agent gets the most out of it.