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Gemini 3 Flash Preview vs Grok 3 Mini
Side-by-side pricing, context window, features, and per-use-case verdict. Data sourced from LiteLLM, updated regularly.
Specifications
| Feature | Gemini 3 Flash Preview | Grok 3 Mini |
|---|---|---|
| Provider | vertex ai-language-models | xai |
| Model ID | gemini-3-flash-preview | xai/grok-3-mini |
| Input / 1M tokens | $0.50 | $0.30 (40% cheaper) |
| Output / 1M tokens | $3.00 | $0.50 (83% cheaper) |
| Cached input / 1M | $0.05 | $0.07 |
| Context window | 1049kk tokens | 131kk tokens |
| Max output | 66kk tokens | 131kk tokens |
| Vision | ✅ | ⬜ |
| Function calling | ✅ | ✅ |
| Prompt caching | ✅ | ✅ |
| Web search | ✅ | ✅ |
| JSON schema | ✅ | ⬜ |
Monthly cost comparison
No cache discount applied — pure token costs at three usage scales.
| Scale | Gemini 3 Flash Preview | Grok 3 Mini | Winner |
|---|---|---|---|
| Small 1M in / 0.2M out | $1.10 | $0.40 | Grok 3 Mini saves 64% |
| Medium 10M in / 2M out | $11.00 | $4.00 | Grok 3 Mini saves 64% |
| Large 100M in / 20M out | $110 | $40.00 | Grok 3 Mini saves 64% |
Category winners
Cheapest input
Grok 3 Mini
$0.30/M
· 40% less than the other
Cheapest output
Grok 3 Mini
$0.50/M
· 83% less than the other
Larger context
Gemini 3 Flash Preview
1049kk tokens · 700% larger window
More features
Gemini 3 Flash Preview
5 / 5 capabilities
Better for…
High-volume RAG & repeated context
$0.05/M cached input — prompt caching makes repeated context retrieval significantly cheaper
Gemini 3 Flash Preview
Short interactions & high-throughput APIs
$0.50/M output — 83% cheaper on output at scale
Grok 3 Mini
Long-document processing & large codebases
1049k context window vs 131k — 700% larger context
Gemini 3 Flash Preview
Agentic workflows & tool use
Supports 5 of 5 tracked capabilities (vision, function calling, caching, web search, JSON schema)
Gemini 3 Flash Preview
Deep-dive on each model
Pricing data sourced from LiteLLM and refreshed regularly. Always verify with each provider's official pricing page before making business decisions.