Gemini 3 Pro in Short
Gemini 3 Pro is Google's flagship for long-context, multimodal, and grounded tasks — its standout being a context window up to ~2M tokens. If you routinely stuff whole codebases, long documents or big transcripts into a prompt, it's a natural fit. Here's the honest review.
Pricing (Watch the Tier)
| Context | Input (1M) | Output (1M) |
|---|---|---|
| ≤200K | ~$2 | ~$12 |
| >200K | ~$4 | ~$18 |
Costs step up above 200K tokens — great to have the window, but don't fill it needlessly. Note Gemini Pro tiers are paid-only (since April 2026). Full detail in Gemini Pro API guide and Gemini 2.5 Pro pricing.
What It's Best At
- Huge context — whole repos, long PDFs, hours of transcripts in one call.
- Multimodal understanding across text, images and more.
- Grounding — factual tasks where up-to-date, cited context helps.
How It Compares
Against GPT-5.6 and Claude Opus 4.8, Gemini 3 Pro's differentiator is context size and Google-ecosystem grounding; GPT-5.6 Sol leads on coding-agent benchmarks and Claude on some reasoning/writing. For most everyday work, Gemini 3.5 Flash (~$1.50/$9) or Flash-Lite delivers most of the value far cheaper. Head-to-heads: Gemini vs GPT, Claude vs Gemini, and the four-way Claude vs GPT vs Gemini vs DeepSeek.
When NOT to Use Pro
If you're not using the giant context, you're overpaying. Route normal chat/extraction to Flash or DeepSeek V4 Flash; reserve Pro for genuinely long-context or hardest multimodal tasks. Pattern: how to choose an LLM and context window comparison.
Call It
curl -X POST https://api.linkmodel.ai/v1/chat/completions \
-H "Authorization: Bearer $LINKMODEL_API_KEY" -H "Content-Type: application/json" \
-d '{ "model": "gemini-3.1-pro-preview", "messages": [{"role":"user","content":"Summarize this 300-page contract and flag risks: ..."}] }'Through LinkModel, call Gemini 3 Pro and A/B against GPT-5.6 and Claude on one key, up to 30% below official. Confirm the endpoint in the docs; get a key via how to get a Gemini API key.
Bottom Line
Gemini 3 Pro shines on long-context and multimodal grounding, but the >200K tier gets pricey and most tasks are better served by Flash. Use Pro when the context window is the whole point — otherwise go cheaper.
Start free with a $1 credit and test Gemini 3 Pro.