Gemini 2.5 Flash vs Grok 4.3
Both are Mid-tier models, from Google and xAI respectively. Gemini 2.5 Flash is the cheaper choice overall at a 4:1 input:output ratio.
Which is cheaper
- Input price: Gemini 2.5 Flash is cheaper ($0.30 vs $1.25).
- Output price: tied at $2.50.
- Blended, 4:1 input:output ratio: Gemini 2.5 Flash is 50.7% cheaper ($0.74 vs $1.50 per weighted 1M tokens).
Side by side
| Spec | Gemini 2.5 Flash | Grok 4.3 |
|---|---|---|
| Provider | xAI | |
| Tier | Mid | Mid |
| Context window | 1M | 1M |
| Max output | — | — |
| Input $/1M | $0.30 | $1.25 |
| Output $/1M | $2.50 | $2.50 |
| Cache read $/1M | $0.03 | $0.20 |
| Modalities | text, image | text, image |
Gemini 2.5 Flash. Standard tier, text/image/video rate; audio input $1.00/1M. Cache storage $1.00/1M tokens/hour. Page explicitly states this model supports a 1M token context window.
Grok 4.3. Short-context rate, for prompts under 200K tokens. At 200K and above: $2.50 input / $5 output, cache read $0.40 per 1M. Eligible for a 20% Batch API discount.
Sources
Gemini 2.5 Flash — verified August 29, 2026
Grok 4.3 — verified August 29, 2026
Full Gemini 2.5 Flash pricing page → · Full Grok 4.3 pricing page →