Grok 4.6 Paid vs 
Gemini 3.8 Flash Paid
Grok 4.6 vs Gemini 3.8 Flash compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
Grok 4.6 — full profile › · Gemini 3.8 Flash — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$6 /M outputManaged API (no infra to run)
$3.75 /M outputManaged API (no infra to run)
Grok 4.6 vs Gemini 3.8 Flash specs
| Spec | Grok 4.6 | Gemini 3.8 Flash | Winner |
|---|---|---|---|
| Maker | xAI | – | |
| Type | Proprietary | Proprietary | – |
| Context window | 500K tokens | 1M tokens | |
| Input price | $2/M | $0.75/M | |
| Output price | $6/M | $3.75/M | |
| Vision / multimodal | Yes | Yes | = Tie |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | No (API only) | No (API only) | – |
| License | Proprietary | Proprietary | – |
Price gap & when to choose each
Gemini 3.8 Flash is ~1.6× cheaper than Grok 4.6 on output tokens ($3.75 vs $6 per M tokens).
- You want frontier performance through a managed API
- You value reliability & ecosystem
- You don't want to manage infrastructure
- You want frontier performance through a managed API
- You need the longer 1M context window
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | Grok 4.6 | Gemini 3.8 Flash |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✗ | ✓ |
Benchmarks: Grok 4.6 vs Gemini 3.8 Flash
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Grok 4.6 and Gemini 3.8 Flash score
| Criterion | Grok 4.6 | Gemini 3.8 Flash |
|---|---|---|
| Cost-efficiency | 4.0 | 4.0 |
| Context window | 4.5 | 5.0 |
| 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
Grok 4.6 Paid
Grok 4.6 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.
Gemini 3.8 Flash Paid
Gemini 3.8 Flash is Google's most intelligent Flash model with significant gains from 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Grok 4.6 vs Gemini 3.8 Flash — which is cheaper?
Gemini 3.8 Flash is cheaper on output ($3.75/M vs $6/M).
Which has the larger context window?
Gemini 3.8 Flash offers the larger context window (1M tokens).
Grok 4.6 vs Gemini 3.8 Flash — which should I pick in 2026?
Choose Gemini 3.8 Flash for the lower output price ($3.75/M vs $6/M). It also gives you the larger 1M context window.
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