GPT-5.2 vs Gemini 3 Pro: 2026 Comparison

GPT-5.2 and Gemini 3 Pro are the flagship models from OpenAI and Google. They perform similarly on many benchmarks, but each has distinct strengths. Here is the short version:

Released December 11, 2025,^[1] GPT-5.2 is OpenAI's third major update to the GPT-5 series in four months. OpenAI says it improves across a wide range of tasks.

Strong Points:

• 90%+ ARC-AGI-1^[2] — First model to break 90% on the general reasoning benchmark
• 100% AIME 2025^[3] — Perfect score on mathematical reasoning
• 55.6% SWE-Bench Pro^[3] — 12+ percentage points better than Gemini 3 Pro
• 128K Output Tokens^[1] — Largest output capacity listed here
• Three Variants — Instant (fast), Thinking (reasoning), Pro (accuracy)

According to OpenAI, GPT-5.2 scores higher than human experts on 70.9% of GDPval tasks at 11x the speed and less than 1% of the cost. It is optimized for spreadsheets, presentations, image perception, and code.

Released December 2025, Gemini 3 Pro is Google's flagship model. Its 2M token context window^[4] is 5x larger than GPT-5.2's, and its multimodal capabilities are strong.

Strong Points:

• 2M Token Context^[4] — Process entire codebases, books, or video transcripts
• 54.2% Terminal-Bench 2.0^[5] — Strong tool use and computer operation
• Native multimodal — Strong image, video, and audio understanding
• Deep Think Mode — Extended reasoning for complex problems
• Generative Interfaces — New capability for visual layout generation

Gemini integrates with Google Workspace, AI Studio, and Vertex AI. The new Gemini Agent can handle multi-step tasks.

General Reasoning — Winner: GPT-5.2

GPT-5.2 is the first model to score above 90% on ARC-AGI-1,^[2] the benchmark designed to test general reasoning ability. Its 100% score on AIME 2025 math^[3] shows very strong reasoning.

Coding — Winner: GPT-5.2

GPT-5.2 leads SWE-Bench Pro at 55.6%^[3] — more than 12 percentage points above Gemini 3 Pro. For agentic coding tasks, GPT currently has the edge.

Context Window — Winner: Gemini 3 Pro (5x larger)

Gemini's 2M context^[4] vs GPT's 400K^[1] is a big difference. For processing entire codebases, book-length documents, or extended conversations, Gemini can handle 5x more information.

Multimodal — Winner: Gemini 3 Pro

Gemini 3 Pro is built for multimodal tasks. It is strong at image understanding, video analysis, and audio processing. GPT-5.2 supports multimodal input but it's not its primary strength.

Speed — Winner: GPT-5.2

GPT-5.2's Instant mode provides fast responses for everyday tasks. Gemini 3 Pro is categorized as medium speed. For quick answers, GPT is faster.

Output Length — Winner: GPT-5.2

GPT-5.2 can output up to 128K tokens^[1] vs Gemini's 65K.^[4] For generating long documents or extensive code, GPT can produce more in a single response.

Choose GPT-5.2 if you need:

• Top reasoning ability (90%+ ARC-AGI)
• Mathematical problem solving (100% AIME)
• Agentic coding (55.6% SWE-Bench Pro)
• Fast responses (Instant mode)
• Long outputs (128K tokens)

Choose Gemini 3 Pro if you need:

• Massive context (2M tokens)
• Multimodal analysis (images, video, audio)
• Google ecosystem integration
• Large document processing
• Deep Think extended reasoning

GPT-5.2 and Gemini 3 Pro are both strong. GPT leads on reasoning and coding benchmarks. Gemini leads on context size and multimodal capabilities. The right choice depends on your task.

Rather than choosing one, use both. With Go Ask Chat, switch between GPT-5.2 and Gemini 3 Pro mid-conversation. Use GPT for reasoning and coding, Gemini for large-scale analysis and multimodal tasks.

Neither is universally better. GPT-5.2 leads on reasoning (ARC-AGI), math (AIME), and coding (SWE-Bench Pro). Gemini leads on context size (2M vs 400K) and multimodal capabilities. They perform similarly on many other benchmarks.

GPT-5.2 leads on SWE-Bench Pro (55.6% vs ~43%). However, Gemini's 2M context can process larger codebases at once. For code generation, GPT has the edge. For code analysis of large projects, Gemini's context is valuable.

GPT-5.2 in Instant mode is faster than Gemini 3 Pro. For quick tasks, use GPT-5.2 Instant. For deep analysis, both offer thinking/reasoning modes.

Yes. Go Ask Chat includes GPT-5.2, Gemini 3 Pro, Claude Opus, Grok, and more. Switch between them with one click, even mid-conversation.