Gemini 3.5 Flash vs Grok 4.3
Google's budget powerhouse against xAI's mid-tier model. Gemini 3.5 Flash is 50% cheaper on input and 40% cheaper on output — with an 8x larger context window.
Pricing data verified: 2026-06-20
| Specification | Gemini 3.5 Flash (Google) | Grok 4.3 (xAI) |
|---|---|---|
| Input Price (per 1M tokens) | $1.50 | $3.00 |
| Output Price (per 1M tokens) | $9.00 | $15.00 |
| Context Window | 1M | 128K |
| Tier | Budget | Mid |
| Provider | xAI |
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Other Models to Consider
Which Model for Which Use Case?
Cost-Sensitive Production
Gemini 3.5 Flash at $1.50/$9.00 is 50% cheaper on input and 40% cheaper on output than Grok 4.3. At scale, this adds up to significant savings.
Real-Time Social Analysis
Grok 4.3 has real-time access to X/Twitter data, making it ideal for social media monitoring, trend analysis, and real-time sentiment analysis.
Long Document Processing
Gemini 3.5 Flash's 1M context window is 8x larger than Grok 4.3's 128K. For long documents, legal contracts, or large codebases, Gemini handles it natively.
Conversational AI
Grok 4.3 is known for its witty, engaging conversational style. If you're building a chatbot that needs personality, Grok's training gives it an edge.
Comparing Google vs xAI Models?
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Frequently Asked Questions
Is Gemini 3.5 Flash cheaper than Grok 4.3?
Yes. Gemini 3.5 Flash costs $1.50/M input and $9.00/M output — 50% cheaper on input and 40% cheaper on output than Grok 4.3's $3.00/M input and $15.00/M output.
When would I choose Grok 4.3 over Gemini 3.5 Flash?
Choose Grok 4.3 if you need xAI's real-time knowledge from X/Twitter, prefer Grok's conversational style, or need features unique to the xAI ecosystem. Grok 4.3 also has a 128K context window which is sufficient for many use cases.
Which model has a larger context window?
Gemini 3.5 Flash has a 1M token context window — 8x larger than Grok 4.3's 128K context window. This makes Gemini 3.5 Flash better for processing long documents and complex multi-turn conversations.