Gemini 3.1 Pro vs Grok 4.3
Google vs xAI · Prices checked 12 August 2026
On blended cost Grok 4.3 undercuts Gemini 3.1 Pro by about 3.1×: $1.63 per million tokens versus $5.00. A single 100K-input, 10K-output job costs $0.150 on Grok 4.3 against $0.320 on Gemini 3.1 Pro.
Context is level at 1,000,000 tokens on each side.
Pricing and capacity
| Metric | Gemini 3.1 Pro | Grok 4.3 | Difference |
|---|---|---|---|
| Input / 1M tokens | $2.00 | $1.25 | 38% |
| Output / 1M tokens | $12.00 | $2.50 | 4.8× |
| Blended · 70/30calculated | $5.00 | $1.63 | 3.1× |
| Blended · 50/50calculated | $7.00 | $1.88 | 3.7× |
| Blended · 80/20calculated | $4.00 | $1.50 | 2.7× |
| Blended · 20/80calculated | $10.00 | $2.25 | 4.4× |
| Job cost · 100K + 10Kcalculated | $0.320 | $0.150 | 2.1× |
| Job cost · 1M + 100Kcalculated | $3.20 | $1.50 | 2.1× |
| Context window | 1,000,000 | 1,000,000 | level |
Input and output rates are as published by each provider. Blended and job-cost rows are calculated comparison metrics, not published prices — how they are derived.
Benchmarks
These two models do not currently report scores on any of the same benchmark suites, so there is no like-for-like capability comparison to show. Rather than pad the page with one-sided numbers, the benchmark leaderboards list every score we do hold.
What each model is for
Gemini 3.1 Pro
Google · Frontier
A mid-cycle upgrade to Gemini 3 Pro, released after rapid iteration on feedback from the November 3 Pro launch. Google positions it for the most complex tasks, with the clearest gains in ambitious agentic workflows. Keeps the 1M-token context window and full multimodal input.
- Agentic workflow execution
- Complex multi-step reasoning
- 1M-token context
- Text, image, audio and video input
Grok 4.3
xAI · Frontier
xAI's current flagship, fully rolled out to the API at the end of April 2026 at $1.25/$2.50 per MTok, roughly 40% below its predecessor on input and 60% on output. It adds native video input, document generation for PDFs, spreadsheets and slides, improved tool-calling, and three adjustable reasoning-intensity levels, alongside a 1M-token context window.
- Aggressive pricing for a flagship tier
- Native video input
- Document generation (PDF, spreadsheet, slides)
- Three adjustable reasoning-intensity levels
Frequently asked questions
Which is cheaper, Gemini 3.1 Pro or Grok 4.3?
On blended cost Grok 4.3 undercuts Gemini 3.1 Pro by about 3.1×: $1.63 per million tokens versus $5.00. A single 100K-input, 10K-output job costs $0.150 on Grok 4.3 against $0.320 on Gemini 3.1 Pro. Blended cost weights input at 70% and output at 30%; price your own token split for an exact answer, since the cheaper model on a blended basis is not always cheaper for your workload.
Which has the larger context window, Gemini 3.1 Pro or Grok 4.3?
Context is level at 1,000,000 tokens on each side. The context window caps everything in a single request: prompt, retrieved documents, conversation history and the model’s own output all share it.
Can I compare Gemini 3.1 Pro and Grok 4.3 on my own numbers?
Yes. Open both in the side-by-side comparison tool to see every field at once, or use the token calculator to price your actual prompt and monthly request volume against each model. Both are free and need no sign-up.
Price it for your own workload
Related matchups
Terms used on this page
Prices and scores are recomputed on every deploy from the catalogue. Prices checked 12 August 2026.