Claude Opus 4.6 vs GPT-5.2 vs Gemini 3 Pro: The 2026 AI Benchmark Showdown
How the three leading AI models compare across coding, reasoning, math, and multimodal benchmarks — with each model claiming victories in different domains.
Three Models, Three Strengths
The AI benchmark landscape in February 2026 shows no single model dominating across all categories. Here's how Claude Opus 4.6, GPT-5.2, and Gemini 3 Pro compare.
Coding
| Benchmark | Claude Opus 4.6 | GPT-5.2 | Gemini 3 Pro |
|---|---|---|---|
| SWE-bench Verified | 80.9% | 80.6% | ~75% |
| Claude Code Preference | Winner | — | — |
Claude holds a narrow lead in real-world software engineering tasks.
Reasoning & Math
| Benchmark | Claude Opus 4.6 | GPT-5.2 | Gemini 3 Pro |
|---|---|---|---|
| ARC-AGI-2 | ~58% | 77.1% | 31.1% |
| AIME 2025 Math | ~95% | 100% | ~90% |
GPT-5.2 dominates reasoning benchmarks, with more than double Gemini's score on ARC-AGI-2.
Multimodal & Context
- Gemini 3 Pro offers the largest context window: 1 million tokens standard
- Claude Opus 4.6 matches with 1M tokens (new in 4.6)
- GPT-5.2 shows 65% fewer hallucinations than GPT-4o
Market Share
- ChatGPT: 68% (down 19 percentage points)
- Google Gemini: 18.2% (up from 5.4%)
- Claude: 21% of global LLM usage
Bottom Line
GPT-5.2 delivers unmatched reasoning and speed. Claude Opus 4.6 dominates coding and agentic workflows. Gemini 3 Pro breaks new ground in multimodal intelligence. The "best model" depends entirely on your use case.
Source: LM Council | SitePoint | CosmicJS | Improvado
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