Gemini 3 Pro
Google·Nov 2025reasoningproprietary
73.6
modhub Index
Gemini 3 Pro was the release that put Google decisively back at the frontier: it led GPQA Diamond (91.9%), Humanity's Last Exam (37.5% without tools) and most multimodal benchmarks at launch, topping LMArena by a wide margin. It introduced Google Antigravity for agentic development and powered AI Mode in Search. The 3.1 series has since refined it, but Gemini 3 Pro remains the canonical reference point of late-2025 frontier capability.
Benchmark results
Where it shines
- Generational leap in scientific and abstract reasoning
- Best-in-class multimodal understanding at release
- 1M context with strong long-context recall
Alternatives to Gemini 3 Pro
OpenAI's August 2025 unified flagship that merged the GPT and o-series reasoning lines into one model with selectable effort.
OpenAI's flagship reasoning model with a 1M-token context window, built for hard coding, science and long-horizon agentic work.
OpenAI's dedicated 2025 reasoning model that pioneered thinking-with-images and agentic tool use within chain-of-thought.
The sparse-attention release that halved DeepSeek's already-lowest-in-class prices while keeping GPT-class quality.
Frequently asked questions
- How much does the Gemini 3 Pro API cost?
- Gemini 3 Pro costs $2 per million input tokens and $12 per million output tokens, with cached input at $0.2 per million. A workload of 10M input and 1.5M output tokens per month costs about $38.00.
- What is the context window of Gemini 3 Pro?
- Gemini 3 Pro supports a context window of 1,000,000 tokens (1M), with up to 66K output tokens per response.
- Is Gemini 3 Pro open source?
- No — Gemini 3 Pro is a proprietary model available through Google's API and partner platforms.
- What are the best alternatives to Gemini 3 Pro?
- The closest alternatives by overall capability are GPT-5, GPT-5.5, OpenAI o3, DeepSeek V3.2. See the comparison pages for detailed head-to-head breakdowns.