Model comparison
Grok 4.20 vs Gemini 3 Deep Think
xAI (Grok)Grok 4.20
- Input
- $1.25 / 1M tokens
- Output
- $2.50 / 1M tokens
- Context
- 1M
- Released
- 2026-03
- Input
- Included with Google AI Ultra
- Output
- Included with Google AI Ultra
- Context
- 1M
- Released
- 2025-12-03
Short answer
Gemini 3 Deep Think scores higher on 2 of the 2 benchmarks both models report.
Specs and pricing side by side
| Spec | Grok 4.20 | Gemini 3 Deep Think |
|---|---|---|
| Maker | xAI (Grok) | |
| Released | 2026-03 | 2025-12-03 |
| Context window | 1M | 1Msame |
| Max output | not published | 64K tokens |
| Input price | $1.25 / 1M tokens | Included with Google AI Ultra |
| Output price | $2.50 / 1M tokens | Included with Google AI Ultra |
| Parameters | not published | Undisclosed (sparse mixture-of-experts) |
| License | Proprietary | Proprietarysame |
| Weights | API only | API onlysame |
| Modalities | Text, Vision | Text, Vision, Audio, Video |
| Knowledge cutoff | November 2024 | January 2025 |
Benchmarks both models report
| Benchmark | Grok 4.20 | Gemini 3 Deep Think |
|---|---|---|
| GPQA Diamond | 88.5% | 93.8% |
| Humanity's Last Exam | 30% | 41% |
Scores are as published by each maker or its cited source; harness, reasoning effort and date can differ between rows, so treat small gaps as ties. Sources are listed on each model page.
Which one should you pick?
Pick Grok 4.20 if…
- Your use case is: complex math, science, and multi-step analytical problems that benefit from the reasoning variant.
Pick Gemini 3 Deep Think if…
- You care about GPQA Diamond, Humanity's Last Exam (it scores higher on 2 shared benchmarks).
- You need Audio / Video input, which Grok 4.20 lacks.
- Your use case is: tackling competition-grade and research-level mathematics and proofs.
FAQ
Which is better, Grok 4.20 or Gemini 3 Deep Think?
Gemini 3 Deep Think scores higher on 2 of the 2 benchmarks both models report. The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.
What are the context windows of Grok 4.20 and Gemini 3 Deep Think?
Grok 4.20 offers 1M; Gemini 3 Deep Think offers 1M with up to 64K tokens output.
Is Grok 4.20 newer than Gemini 3 Deep Think?
Grok 4.20 was released 2026-03; Gemini 3 Deep Think was released 2025-12-03.
Go deeper
- Grok 4.20: full specs, pricing and benchmarks
- Gemini 3 Deep Think: full specs, pricing and benchmarks
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