AI model comparison
Gemini 3.5 Flash Lite vs Grok 4.20
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Gemini 3.5 Flash Lite
Gemini 3.5 Flash Lite is a high-efficiency model from Google with upgraded agentic capabilities.
- Input / 1M
- $0.30
- Output / 1M
- $2.50
- Context
- 1.05M
xAI
Grok 4.20
Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities.
- Input / 1M
- $1.25
- Output / 1M
- $2.50
- Context
- 2M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Gemini 3.5 Flash Lite
2.0x cheaper for a typical chat
Higher intelligence score
Grok 4.20
25.7 vs 22.2 on Artificial Analysis
Larger context window
Grok 4.20
2M vs 1.05M tokens
Newer release
Gemini 3.5 Flash Lite
Released July 21, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Gemini 3.5 Flash Lite22.2Coding index
Gemini 3.5 Flash Lite49.3Agentic index
Gemini 3.5 Flash Lite14.3Pricing
Gemini 3.5 Flash Lite vs Grok 4.20 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Gemini 3.5 Flash Lite | |
|---|---|---|
| Input tokensPer 1M tokens | $0.30 | $1.25 |
| Output tokensPer 1M tokens | $2.50 | $2.50 |
| Cached input (read)Per 1M tokens | $0.03 | $0.20 |
| Cache writePer 1M tokens | $0.08 | Not available |
| Long-context pricingPer 1M tokens, for very long prompts | Same rate at any length | $2.50 in / $5 out above 200K |
| Web searchPer request | $0.014 | $0.005 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Gemini 3.5 Flash Lite$1.85Coding task
30K in, 4K out
Gemini 3.5 Flash Lite$19$10.90 cachedLong document summary
150K in, 2K out
Gemini 3.5 Flash Lite$50$9.50 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Gemini 3.5 Flash Lite | |
|---|---|---|
| Context window | 1.05M tokens | 2M tokens |
| Max output | 66K tokens | 1.80M tokens |
| Input types | Audio, File, Image, Text, Video | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium, Low, Minimal | Not available |
| Default reasoning effort | Minimal | Not available |
| Release date | July 21, 2026 | March 31, 2026 |
Features
Supported features
API features available for each model.
| Metric | Gemini 3.5 Flash Lite | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Gemini 3.5 Flash LiteView full model details- Gemini 3.5 Flash Lite vs DeepSeek V4 Flash 0423
- Gemini 3.5 Flash Lite vs Gemini 3 Flash Preview
- Gemini 3.5 Flash Lite vs Gemini 2.5 Flash
- Gemini 3.5 Flash Lite vs GPT-5.4 Mini
- Gemini 3.5 Flash Lite vs GPT-5 Mini
- Gemini 3.5 Flash Lite vs GPT-5.4 Nano
- Gemini 3.5 Flash Lite vs MiniMax M2.7
- Gemini 3.5 Flash Lite vs Grok 4.3
- Gemini 3.5 Flash Lite vs GLM 4.7
- Gemini 3.5 Flash Lite vs Kimi K2.5
- Gemini 3.5 Flash Lite vs GLM 5V Turbo
- Gemini 3.5 Flash Lite vs GPT-5
- Gemini 3.5 Flash Lite vs Nemotron 3 Ultra
- Gemini 3.5 Flash Lite vs Qwen3.5-27B
- Gemini 3.5 Flash Lite vs MiniMax M2.5
- Gemini 3.5 Flash Lite vs Qwen3.5 397B A17B
- Gemini 3.5 Flash Lite vs Kimi K2 Thinking
- Gemini 3.5 Flash Lite vs Qwen3.6 27B
- Gemini 3.5 Flash Lite vs MiniMax M2.1
- Gemini 3.5 Flash Lite vs GPT-5.1-Codex-Mini
- Grok 4.20 vs Grok Build 0.1
- Grok 4.20 vs Kimi K2.6
- Grok 4.20 vs Qwen3.6 Plus
- Grok 4.20 vs GLM 5 Turbo
- Grok 4.20 vs Gemini 3 Flash Preview
- Grok 4.20 vs GLM 5.1
- Grok 4.20 vs Kimi K2.7 Code
- Grok 4.20 vs Inkling Small
- Grok 4.20 vs Qwen3.7 Plus
- Grok 4.20 vs Inkling
- Grok 4.20 vs Grok 4.3
- Grok 4.20 vs DeepSeek V4 Flash 0423
Our take
Gemini 3.5 Flash Lite is 2.0x cheaper for a typical chat. Grok 4.20 scores higher on the Artificial Analysis Intelligence Index (25.7 vs 22.2). Grok 4.20 has the larger context window (2M vs 1.05M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Gemini 3.5 Flash Lite or Grok 4.20 cheaper?
Gemini 3.5 Flash Lite is cheaper for a typical chat (2K input tokens and 500 output tokens). Gemini 3.5 Flash Lite costs $0.30 per 1M input tokens and $2.50 per 1M output tokens, while Grok 4.20 costs $1.25 per 1M input tokens and $2.50 per 1M output tokens.
Which has a bigger context window, Gemini 3.5 Flash Lite or Grok 4.20?
Grok 4.20 supports up to 2M tokens of context, compared with 1.05M for Gemini 3.5 Flash Lite.
Is Gemini 3.5 Flash Lite smarter than Grok 4.20?
On the Artificial Analysis Intelligence Index, Gemini 3.5 Flash Lite scores 22.2 and Grok 4.20 scores 25.7, putting Grok 4.20 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Gemini 3.5 Flash Lite and Grok 4.20 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Gemini 3.5 Flash Lite and Grok 4.20 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Gemini 3.5 Flash Lite and Grok 4.20 at the same time. Compare the answers side by side and keep the best one.