Claude Opus 4 5 Is Here And Beats Gemini 3 Pro I Tested It

Bonisiwe Shabane

-Jan 2, 2026, 5:06 AM

claude opus 4 5 is here and beats gemini 3 pro i tested it

This YouTube insight note was created with LilysAI. Sign up free and get 10× faster, deeper insights from videos. This head-to-head comparison directly pits Claude Opus 4.5 against Gemini 3 Pro, focusing on real-world coding and agent tasks, not just benchmarks. Discover which model offers superior code quality and task completeness for complex projects like building an "Apple-like" website and a Go-based terminal game. Learn about the new, significantly lower pricing for Opus 4.5 and its practical implications for everyday AI use. Introduction of Opus 4.5 and Comparison:

Completion Time and Cost Analysis (Test 1): Completion Time and Cost Analysis (Test 2): In-depth comparison of Claude Opus 4.5 and Gemini 3 Pro across benchmarks, pricing, context windows, multimodal capabilities, and real-world performance. Discover which AI model best fits your needs. Two AI giants released flagship models within a week of each other in late November 2025. On November 18, Google launched Gemini 3 Pro with the industry's largest context window at 1 million tokens. Six days later, Anthropic responded with Claude Opus 4.5, the first model to break 80% on SWE-bench Verified, setting a new standard for AI-assisted coding. These models represent fundamentally different design philosophies.

Gemini 3 Pro prioritizes scale and multimodal versatility: a 1M token context window, native video/audio processing, and Deep Think parallel reasoning. Claude Opus 4.5 focuses on precision and persistence: Memory Tool for cross-session state, Context Editing for automatic conversation management, and unmatched coding accuracy. This comparison examines where each model excels, where it falls short, and which one fits your specific use case. Claude Opus 4.5 achieves an 80.9% score on SWE-bench Verified, the highest of any AI model. This benchmark tests real GitHub issues: understanding codebases, identifying bugs, and implementing multi-file fixes. For developers working on complex software projects, this represents a step change in AI assistance.

Comparing Claude Opus 4.5 from Anthropic with Gemini 3 Pro Preview from Google? Instead of managing separate API keys and subscriptions, get both with Writingmate. This YouTube insight note was created with LilysAI. Sign up free and get 10× faster, deeper insights from videos. This head-to-head comparison directly pits Claude Opus 4.5 against Gemini 3 Pro, focusing on real-world coding and agent tasks, not just benchmarks. Discover which model offers superior code quality and task completeness for complex projects like building an "Apple-like" website and a Go-based terminal game.

Learn about the new, significantly lower pricing for Opus 4.5 and its practical implications for everyday AI use. Introduction of Opus 4.5 and Comparison: Completion Time and Cost Analysis (Test 1): Completion Time and Cost Analysis (Test 2): Gemini 3 and Claude Opus 4.5 represent two different answers to the same question. What should a flagship AI optimize for when compute, context, and capability are no longer the primary constraints. One model prioritizes breadth, multimodality, and synthesis at scale. Even during a week that has felt like one endless model release after another. But I’m not here to tell you this is a big deal because of benchmarks.

I’m here to tell you something more useful: How Opus 4.5 actually performed vs. Gemini 3 and ChatGPT 5.1 on messy, real world tests. And I have to give credit where it’s due! My Substack chat came up with this test: specifically credit to reader Kyle C., who suggested a real-world test based on his tree business. Specifically, he had photos of rough tallies for shipped and received trees, and there were discrepancies. He had tested Gemini vs.

Opus 4.5 head-to-head with eye-opening results—I wanted to go farther. So I riffed on Kyle’s idea and came up with the great Christmas tree challenge of 2025: A hands-on comparison. We put Opus 4.5 and Gemini 3 Pro on the same brief and tested landing page design, clarity, and usefulness. We compared Claude Opus 4.5 and Gemini 3 Pro on the same landing page brief. Opus 4.5 produced a clean, conversion-focused HTML you can deploy quickly.

Gemini 3 Pro pushed creative features and product ideas that can inspire experiments. Use Opus for reliable execution and Gemini for feature exploration, or combine their strengths. Most AI headlines make broad claims. This one is a simple experiment. I gave Claude Opus 4.5 and Gemini 3 Pro the same prompt and a real startup idea. Then I compared what they produced.

We used a focused brief: build a conversion-optimized landing page HTML for a startup called Estate Clear. Minimal direction. One model used a front-end design skill. The other ran in a standard AI studio flow. That kept the test simple. Same input.

Same idea. Different models. Opus 4.5 delivered a tidy, predictable result. The design felt restrained. The copy was clear and calm. It prioritized clarity over flash.

The page structure matched common conversion patterns: headline, problem, solution, features, social proof, call to action. The visual language it suggested was subtle and trustworthy, not loud. If you’re choosing between Claude 4.5 Opus and Gemini 3 Pro right now, the stakes are real. Claude 4.5 Opus is the best executor on code and tools, while Gemini 3 Pro (and GPT‑5.1) often win on broad reasoning. “Price per solution” beats sticker price-token efficiency and retries swing the total bill. Below: fast takeaways followed by deeper sections on benchmarks, personas, pricing math, policy, product updates, and a practical buyer’s checklist.

The Anthropic SWE‑bench leaderboard shows Claude 4.5 Opus with a strong SWE‑bench score (~80.9%), an indicator that Opus reads repos, makes changes, and lands fixes more reliably than peers. Anthropic also cites internal tests where Opus matched or beat human engineer baselines. See the Claude 4.5 announcement for details. On agentic tool use, chaining API calls, parsing errors, and retrying smartly, Opus generally edges Gemini 3 Pro. These effects show up in terminal/coding settings and in SWE‑bench variants hosted on GitHub. For broad cross‑domain reasoning, Gemini 3 Pro and GPT‑5.1 tend to sit at the top across suites like GPQA Diamond, MMMU/MMU, and MMLU.

These benchmarks reward long‑horizon planning and synthesis rather than line‑by‑line execution. “Watch for y‑axis tricks.” Many visualizations zoom on narrow bands (e.g., 75%–85%), making small gaps look huge. Replot zero‑based to get a clearer sense. November 2025 was the most intense month in AI history: three tech giants released their flagship models within just six days of each other. We break down the benchmarks, pricing, and real-world performance to help you choose the right model for your needs. In an unprecedented week, all three major AI labs released their flagship models, creating the most competitive AI landscape we've ever seen:

Here's how the three models stack up on the most important benchmarks for developers and enterprises: Measures ability to solve actual GitHub issues from real software projects Tests advanced academic knowledge across physics, chemistry, and biology In-depth comparison of Claude Opus 4.5 and Gemini 3 Pro across benchmarks, pricing, context windows, multimodal capabilities, and real-world performance. Discover which AI model best fits your needs. Two AI giants released flagship models within a week of each other in late November 2025.

On November 18, Google launched Gemini 3 Pro with the industry's largest context window at 1 million tokens. Six days later, Anthropic responded with Claude Opus 4.5, the first model to break 80% on SWE-bench Verified, setting a new standard for AI-assisted coding. These models represent fundamentally different design philosophies. Gemini 3 Pro prioritizes scale and multimodal versatility: a 1M token context window, native video/audio processing, and Deep Think parallel reasoning. Claude Opus 4.5 focuses on precision and persistence: Memory Tool for cross-session state, Context Editing for automatic conversation management, and unmatched coding accuracy. This comparison examines where each model excels, where it falls short, and which one fits your specific use case.

Claude Opus 4.5 achieves an 80.9% score on SWE-bench Verified, the highest of any AI model. This benchmark tests real GitHub issues: understanding codebases, identifying bugs, and implementing multi-file fixes. For developers working on complex software projects, this represents a step change in AI assistance. This YouTube insight note was created with LilysAI. Sign up free and get 10× faster, deeper insights from videos. This head-to-head comparison directly pits Claude Opus 4.5 against Gemini 3 Pro, focusing on real-world coding and agent tasks, not just benchmarks.

Discover which model offers superior code quality and task completeness for complex projects like building an "Apple-like" website and a Go-based terminal game. Learn about the new, significantly lower pricing for Opus 4.5 and its practical implications for everyday AI use. Introduction of Opus 4.5 and Comparison: Completion Time and Cost Analysis (Test 1): Completion Time and Cost Analysis (Test 2):

Claude Opus 4 5 Is Here And Beats Gemini 3 Pro I Tested It

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