Gemini 3.1 Flash Lite vs Grok 4.3
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose Gemini 3.1 Flash Lite if you need
- ✓Complex multi-step reasoning or document-level analysis requiring high intelligence
- ✓Helpful, direct responses with integrated real-time tool access
- ✓Maximum performance on challenging text and image tasks despite higher cost
Choose Grok 4.3 if you need
- ✓High-speed, low-latency inference for efficient text, image, and video processing
- ✓Lower cost at $1.5 per million tokens with resource-efficient operation
- ✓Lightweight multimodal handling where peak reasoning depth is not critical
Verdict
Grok 4.3 leads on intelligence (43.9 vs 33.5) and complex multi-step reasoning while Gemini 3.1 Flash Lite dominates speed (310 t/s vs 135 t/s) and price ($1.5 vs $2.5 per million tokens). Both offer roughly 1M-token context, but Grok's higher capability comes with slower output and greater cost, whereas Gemini prioritizes efficiency and low latency for multimodal tasks.
Gemini 3.1 Flash Lite vs Grok 4.3: side by side
| Spec | Gemini 3.1 Flash Lite | Grok 4.3 | Winner |
|---|---|---|---|
| Intelligence | 33.5 | 43.9 | Grok 4.3 |
| Output speed | 310 t/s | 135 t/s | Gemini 3.1 Flash Lite |
| Output price | $1.50/1M | $2.50/1M | Gemini 3.1 Flash Lite |
| Context | 1049K | 1000K | Gemini 3.1 Flash Lite |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | xAI | Tie |
Detailed analysis
Intelligence
Winner: Grok 4.3Grok 4.3 scores 43.9 on the intelligence index compared to Gemini 3.1 Flash Lite's 33.5. This aligns with Grok's documented strength in complex multi-step reasoning versus Gemini's reduced depth on such tasks.
Speed
Winner: Gemini 3.1 Flash LiteGemini 3.1 Flash Lite outputs at 310.24 tokens per second, more than double Grok 4.3's 134.99 t/s. Its strengths explicitly highlight high speed and low latency as core advantages.
Pricing
Winner: Gemini 3.1 Flash LiteGemini 3.1 Flash Lite costs $1.5 per million tokens versus Grok 4.3's $2.5. The lower price supports Gemini's resource-efficient inference design.
Context Window
Winner: TieGrok 4.3 provides a 1,000,000-token context while Gemini 3.1 Flash Lite offers 1,048,576 tokens. Both support very large context windows for document-level multimodal work.
Gemini 3.1 Flash Lite
Pros
- +High speed and low latency
- +Handles very large context windows
- +Broad modality support in a lightweight package
- +Resource-efficient inference
Cons
- –Reduced depth on highly complex reasoning tasks
- –Lite design trades peak capability for speed
- –May require more guidance on nuanced or creative outputs
Grok 4.3
Pros
- +Strong performance on complex multi-step reasoning
- +Large context window for document-level tasks
- +Helpful and direct response style
- +Integrated real-time tool access
Cons
- –Vision capabilities less mature than specialized models
- –Occasional over-refusal on edge-case queries
- –High computational cost for maximum context usage
Summary: Gemini 3.1 Flash Lite vs Grok 4.3
Select Grok 4.3 when intelligence and reasoning depth are the priority despite slower speed and higher cost. Choose Gemini 3.1 Flash Lite for speed, lower price, and efficient multimodal handling where maximum capability is secondary.
Frequently asked questions
Grok 4.3 is stronger for complex reasoning while Gemini 3.1 Flash Lite is better for speed and efficiency; the choice depends on whether intelligence or performance-per-dollar matters most.