Model comparison
Gemini 3.1 Pro Preview vs Grok 4.20 Multi-Agent
Compare Gemini 3.1 Pro Preview vs Grok 4.20 Multi-Agent API pricing: input/output token costs, cache pricing, context windows, workload estimates, and routing fit.
Gemini 3.1 Pro Preview
gemini · gemini/gemini-3.1-pro-preview
- Input
- $2
- Output
- $12
- Context
- 1M
Grok 4.20 Multi-Agent
xai · grok-4.20-multi-agent-0309
- Input
- $1.25
- Output
- $2.5
- Context
- 1M
Quick take
Grok 4.20 Multi-Agent has the lower input price at $1.25 per 1M input tokens. Grok 4.20 Multi-Agent is cheaper for the example blended workload below. Gemini 3.1 Pro Preview has the larger context window at 1M tokens.
Choose Gemini 3.1 Pro Preview if...
- Gemini 3.1 Pro Preview is safer for long documents, repository analysis, and RAG prompts because it has the larger context window.
- Gemini 3.1 Pro Preview is required if images, screenshots, or visual documents are part of the workflow.
Choose Grok 4.20 Multi-Agent if...
- Grok 4.20 Multi-Agent is the better default for cost-sensitive traffic and repeated high-volume calls.
- Grok 4.20 Multi-Agent gives more room for long generated answers, reports, or code output.
Example workload cost
Estimates use input tokens plus 20% output tokens. They exclude provider discounts, cache hits, and tool/search surcharges.
| Workload | Gemini 3.1 Pro Preview | Grok 4.20 Multi-Agent | Cheaper |
|---|---|---|---|
| 1M input + 200K output | $4.40 | $1.75 | Grok 4.20 Multi-Agent |
| 10M input + 2M output | $44.00 | $17.50 | Grok 4.20 Multi-Agent |
| 100M input + 20M output | $440.00 | $175.00 | Grok 4.20 Multi-Agent |
Context, output, and capability fit
Gemini 3.1 Pro Preview provides the larger context window. Check max output separately when the task needs long reports, code generation, or full-document rewrites.
- Gemini 3.1 Pro Preview max output
- 65.5K
- Grok 4.20 Multi-Agent max output
- 1M
- Gemini 3.1 Pro Preview features
- prompt caching, function calling, vision
- Grok 4.20 Multi-Agent features
- prompt caching, function calling
Risk notes for Gemini 3.1 Pro Preview
- Preview or beta model: verify availability and pricing before production rollout.
Risk notes for Grok 4.20 Multi-Agent
- No major capability risk is flagged in this snapshot, but provider pages should still be verified before production routing.