Gemini 3.5 Flash vs Grok 4.5
Price, context and benchmark scores side by side — every number from the live model catalogue.
| Gemini 3.5 Flashgoogle | Grok 4.5x-ai | |
|---|---|---|
| Input / 1M tokens | $1.50 | $2.00 |
| Output / 1M tokens | $9.00 | $6.00 |
| 1M in + 300K out | $4.20 | $3.80 |
| Context window | 1.0M | 500K |
| Intelligence index | 50.2 | 53.8 |
| Coding index | 70.1 | 72.4 |
| Agentic index | 37.4 | 45.7 |
| Cheapest provider | xAI | |
| Providers serving it | 2 | 1 |
| Weights | Closed | Closed |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
| Released | May 19, 2026 | Jul 8, 2026 |
Which one to pick
Pick Gemini 3.5 Flash if…
- You need the bigger context window (1.0M).
- You want provider redundancy: 2 providers serve it.
Pick Grok 4.5 if…
- You want the higher general-intelligence score (53.8).
- Code quality is the priority — it leads on the coding index (72.4).
- You are running agent loops — higher agentic index (45.7).
- Token cost matters: $6.00 per 1M output vs $9.00.
FAQ
Is Gemini 3.5 Flash better than Grok 4.5?
Grok 4.5 scores higher on general intelligence (50.2 vs 53.8), while Grok 4.5 is 1.5× cheaper per output token ($6.00 vs $9.00). For code, Grok 4.5 leads (72.4 coding index). Gemini 3.5 Flash takes the larger context at 1.0M.
Which is cheaper, Gemini 3.5 Flash or Grok 4.5?
Grok 4.5, at $6.00 per 1M output tokens versus $9.00. On a 1M input + 300K output workload that is $3.80 against $4.20.
Can I self-host Gemini 3.5 Flash or Grok 4.5?
Gemini 3.5 Flash: closed weights, API only. Grok 4.5: closed weights, API only.