Gemini 3.5 Flash Paid vs 
Grok 4.5 Paid
Gemini 3.5 Flash vs Grok 4.5 compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
Gemini 3.5 Flash — full profile › · Grok 4.5 — full profile ›
Prices & specs refreshed from live data · OpenSourceAI.tech
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
Gemini 3.5 Flash vs Grok 4.5 specs
| Spec | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| Maker | xAI | |
| Type | Proprietary | Proprietary |
| Context window | 1M tokens | 500K tokens |
| Input price | $1.5/M | $2/M |
| Output price | $9/M | $6/M |
| Vision / multimodal | Yes | Yes |
| Tool / function calling | Yes | Yes |
| Self-hostable | No (API only) | No (API only) |
| License | Proprietary | Proprietary |
Feature comparison
| Capability | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✗ |
Benchmarks: Gemini 3.5 Flash vs Grok 4.5
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Gemini 3.5 Flash and Grok 4.5 score
| Criterion | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| Cost-efficiency | 3.5 | 4.0 |
| Context window | 5.0 | 4.5 |
| Openness | 1.5 | 1.5 |
| Self-hosting | 1.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
Gemini 3.5 Flash Paid
Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution...
Grok 4.5 Paid
Grok 4.5 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Gemini 3.5 Flash vs Grok 4.5 — which is cheaper?
Grok 4.5 is cheaper on output ($6/M vs $9/M).
Which has the larger context window?
Gemini 3.5 Flash offers the larger context window (1M tokens).
Gemini 3.5 Flash vs Grok 4.5 — which should I pick in 2026?
Choose Grok 4.5 for the lower output price ($6/M vs $9/M). Choose Gemini 3.5 Flash if you need the larger 1M context window.
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