Gemini 3.8 Flash vs Grok 4.7
A side-by-side comparison of Gemini 3.8 Flash from Google and Grok 4.7 from xAI, using published pricing, context windows, supported inputs, and release dates.
- Gemini 3.8 Flash input
- $0.825
- Grok 4.7 input
- $2
Key differences
Gemini 3.8 Flash is 59% cheaper on input tokens ($0.825 vs $2 per 1M).
Gemini 3.8 Flash has the larger context window: 1.05M vs 500K tokens.
Grok 4.7 is the newer release (Sep 21, 2026, vs Sep 2, 2026).
Gemini 3.8 Flash vs Grok 4.7 specs
| Spec | Gemini 3.8 Flash | Grok 4.7 |
|---|---|---|
| Provider | xAI | |
| Released | Sep 2, 2026 | Sep 21, 2026 |
| Context window | 1,048,576 tokens | 500,000 tokens |
| Input price / 1M tokens | $0.825 | $2 |
| Output price / 1M tokens | $4.13 | $6 |
| 10K in + 1K out request | $0.012 | $0.026 |
| Accepts | audio, file, image, text, video | file, image, text |
| Produces | text | text |
| Tool calling | Yes | Yes |
| Structured outputs | Yes | Yes |
| Reasoning | Yes | Yes |
| Popularity | 39/100 | 35/100 |
Highlighted values are better on that spec: lower price, larger context window, newer release, or higher popularity. Prices in USD per 1M tokens as listed on OpenRouter.
Gemini 3.8 Flash vs Grok 4.7 questions
Is Gemini 3.8 Flash or Grok 4.7 cheaper?
Gemini 3.8 Flash has the lower listed input price ($0.825 per million tokens). For a request with 10,000 input and 1,000 output tokens, Gemini 3.8 Flash costs about $0.012 and Grok 4.7 about $0.026.
Which has the larger context window?
Gemini 3.8 Flash supports 1,048,576 tokens, the larger of the two.
Which model should I choose?
Pick the cheaper model for high-volume, simpler tasks, and test both on a sample of your real prompts before committing. Price and context size do not measure output quality on your specific workload.