Gemini 3 Flash vs Grok 4.20
Gemini 3 Flash and Grok 4.20 are both current production-tier models. Gemini 3 Flash is meaningfully cheaper at $0.50 / $3 per 1M. Gemini 3 Flash leads on multilingual. Grok 4.20 leads on coding, reasoning, general knowledge.
Specs side by side
| Metric | Google Gemini 3 Flash | xAI Grok 4.20 |
|---|---|---|
| Input price (per 1M) | $0.5 | $2 |
| Output price (per 1M) | $3 | $6 |
| Context window | 1M tokens | 2M tokens |
| Speed tier | fast | balanced |
| Open weights | No | No |
| EU region | Yes | No |
| Free tier | Google AI Studio | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose Gemini 3 Flash if…
- Cost is a priority ($0.50 / $3 per 1M vs $2 / $6 per 1M)
- EU data residency is required
- HIPAA eligibility is required
- You want a free tier for prototyping
- Multilingual is central to your workload
Choose Grok 4.20 if…
- You need 2M context (2× more than Gemini 3 Flash)
- Coding is central to your workload
- Reasoning is central to your workload
Benchmark delta
Gemini 3 Flash leads on
- Multilingual
Grok 4.20 leads on
- Coding
- Reasoning
- General knowledge
- Instruction following
FAQ — Gemini 3 Flash vs Grok 4.20
Gemini 3 Flash vs Grok 4.20 — which is better?
Gemini 3 Flash and Grok 4.20 are both current production-tier models. Gemini 3 Flash is meaningfully cheaper at $0.50 / $3 per 1M. Gemini 3 Flash leads on multilingual. Grok 4.20 leads on coding, reasoning, general knowledge. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does Gemini 3 Flash pricing compare to Grok 4.20?
Gemini 3 Flash costs $0.50 / $3 per 1M vs Grok 4.20 at $2 / $6 per 1M. Gemini 3 Flash is cheaper on output tokens by roughly 100%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Gemini 3 Flash or Grok 4.20 have the bigger context window?
Grok 4.20 has a 2M-token context window — 2× the 1M context of Gemini 3 Flash. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Gemini 3 Flash or Grok 4.20?
Gemini 3 Flash: yes — Reduced daily quota; rate-limited for prototyping. Grok 4.20: no — X Premium includes Grok web chat; API is paid.
Which is better for coding — Gemini 3 Flash or Grok 4.20?
Grok 4.20 leads on coding benchmarks (Gemini 3 Flash: 84/100, Grok 4.20: 91/100). For production coding agents also weigh tool-use performance — Gemini 3 Flash scores 85, Grok 4.20 scores 88.