Gemini 3.1 Pro vs GPT-5.6 Terra — Price, Context, and Capability Compared
Verdict
Gemini 3.1 Pro and GPT-5.6 Terra are priced within a few percent of each other. Gemini 3.1 Pro has the larger context window (2,000,000 tokens). Default to Gemini 3.1 Pro unless you specifically need GPT-5.6 Terra's edge.
Spec comparison
| Gemini 3.1 Pro | GPT-5.6 Terra | |
|---|---|---|
| Price (input) | $2.00/M | $2.00/M |
| Price (output) | $12.00/M | $12.00/M |
| Blended price | $4.50/M | $4.50/M |
| Context window | 2,000,000 tokens ✓ | 400,000 tokens |
| Max output | 64,000 tokens | 128,000 tokens ✓ |
| Modalities | text, vision, audio | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-02 | 2026-06 |
| Speed | 55 t/s | 78 t/s ✓ |
Cost at scale (3:1 blended)
| Tokens / month | Gemini 3.1 Pro | GPT-5.6 Terra | Delta |
|---|---|---|---|
| 1,000,000 | $4.50 | $4.50 | $0.0000 (1.0×) |
| 10,000,000 | $45.00 | $45.00 | $0.0000 (1.0×) |
| 100,000,000 | $450.00 | $450.00 | $0.0000 (1.0×) |
Choose Gemini 3.1 Pro if…
- ✓Largest context window of any current model (2M tokens)
- ✓Native audio and video understanding
- ✓Google Search grounding
- ✓Whole-codebase, whole-document, or long-video analysis in a single request.
Choose GPT-5.6 Terra if…
- ✓Balanced cost-to-intelligence ratio
- ✓Reasoning mode available on demand
- ✓Same 400K context as Sol
- ✓Everyday production workloads that need strong quality without Sol-tier pricing.
Run this exact matchup right now
Send the same prompt to Gemini 3.1 Pro and GPT-5.6 Terra side by side and see the outputs yourself.
Try Gemini 3.1 Pro vs GPT-5.6 Terra FreeFAQ
Is Gemini 3.1 Pro cheaper than GPT-5.6 Terra?
Gemini 3.1 Pro is cheaper, at $4.50 per million blended tokens vs $4.50 for GPT-5.6 Terra.
Which has the bigger context window, Gemini 3.1 Pro or GPT-5.6 Terra?
Gemini 3.1 Pro has the larger context window: 2,000,000 tokens vs 400,000.
Can Gemini 3.1 Pro replace GPT-5.6 Terra for coding?
Both are viable for coding. Largest context window of any current model (2M tokens) (Gemini 3.1 Pro) vs Balanced cost-to-intelligence ratio (GPT-5.6 Terra) — pick based on which strength matters more for your workload.
Which is faster, Gemini 3.1 Pro or GPT-5.6 Terra?
GPT-5.6 Terra is faster: 78 t/s vs 55 t/s, measured on our speed benchmarks.
Related
Pricing verified 2026-04-06. Specs verified 2026-08-08.
