Claude Opus 4.6 vs Claude Opus 4.5 : What is Anthropic’s Smartest Model?

Claude 4.6 is the newest and smartest AI from Anthropic, released in February 2026. It is much better than the old Opus 4.5 because it has a huge 1 million token “memory” and uses “Adaptive Thinking” to solve hard problems without overthinking simple ones. While 4.5 was great at coding, 4.6 is even faster and can run tasks by itself for a long time without getting confused.

However, most users still struggle with AI “forgetting” their instructions in long chats or getting blocked by regional restrictions. It is frustrating to watch your AI lose track of your project right when you need it most.

GlobalGPT, an all-in-one platform, solve all these problems instantly. Our Basic Plan costs only $5.8, giving you full access to ChatGPT 5.2, Claude 4.6, 克勞德 4.5, 雙子座3號專業版, 以及 困惑 in one simple dashboard.

For creative pros who need more, our Pro Plan is just $10.8. This plan lets you handle your whole project from start to finish. You can use Claude 4.6 to write your script, and then use our professional Video and Image AI models like Sora 2 Flash, Veo 3.1，, Kling, Wan, 中途旅程, and Flux to finish the job.

Introducing Claude Opus 4.6: Why the 2026 Upgrade Changes Everything

From Reasoning to Autonomy: The Core Philosophy of the 4.6 Update

Claude Opus 4.6 moves beyond just “thinking” about a problem to actually “doing” the work. It is designed to act as an autonomous agent that can manage its own tasks, plan more carefully, and stay productive over much longer work sessions. While Opus 4.5 was a reasoning leader, Opus 4.6 is built to be a coworker that can handle complex multi-step jobs with almost no help.

Key Specs at a Glance: 1M Context, 128K Output, and Adaptive Thinking

• 1M Context Window: Opus 4.6 can read up to 1 million tokens at once, which is like reading several thick books in one go.
• 128K Output Tokens: It can write massive documents or huge amounts of code in a single reply, double the limit of earlier models.
• Adaptive Thinking: The model now decides for itself when it needs to think harder about a problem and when it can answer quickly.

Timeline: How Opus 4.6 Replaces the 4.5 “Real SOTA” Standard

Released on February 5, 2026, Opus 4.6 replaces Opus 4.5 (from November 2025) as the most intelligent model in the world. It beats its predecessor on almost every test, making it the new “gold standard” for professional AI work.

Claude Opus 4.6 vs Opus 4.5 Performance: Benchmarking the Intelligence Gap

The 190-Point Elo Jump: Analyzing GDPval-AA for Finance and Legal Tasks

In the GDPval-AA test, which looks at high-value office work in law and finance, Opus 4.6 scored 190 Elo points higher than Opus 4.5. It also beat the next best model, GPT-5.2, by 144 points.

Humanity’s Last Exam: Why 4.6 Leads the World in Multi-Disciplinary Reasoning

Opus 4.6 is currently the industry leader on Humanity’s Last Exam. This is a very difficult test that covers many different subjects, proving that the model has better expert-level reasoning than any other model available.

Software Engineering Excellence: Terminal-Bench 2.0 vs. The Original Terminal Bench

While Opus 4.5 was great at software engineering, Opus 4.6 set a new record on Terminal-Bench 2.0. It is significantly better at finding bugs and navigating large codebases without getting lost.

Computational Biology & Life Sciences: The 2x Performance Leap

Opus 4.6 is a massive help for scientists, performing almost 2 times better than Opus 4.5 on tests for organic chemistry, biology, and phylogenetics.

The Battle of Context: 1M Token Window vs. 200K Context Window

Retrieval Accuracy: Solving “Context Rot” with 76% MRCR Score

“Context rot” is when an AI starts to forget things as a conversation gets long. Opus 4.6 fixes this with a 76% score on the 1M token retrieval test, while models like 十四行詩 4.5 scored only 18.5% on the same test.

Long-Context Reasoning: Handling 100,000+ Tokens Without Logic Drift

Opus 4.6 can track information over hundreds of thousands of tokens without losing focus. It picks up small details that Opus 4.5 would often miss when reading very large files.

Context Compaction (Beta): How 4.6 Manages Effectively Infinite Conversations

A new feature called Context Compaction automatically summarizes the older parts of your chat. This allows you to have conversations that never seem to end without hitting the model’s memory limits.

Coding & Agentic Workflow: Senior Engineer vs. Autonomous Team

Multi-Agent Teams in Claude Code: Orchestrating 16 Agents for Complex Builds

Opus 4.6 can now run Agent Teams. In one case, it used 16 agents to build a full C compiler from scratch, writing 100,000 lines of code that could run the game Doom.

Codebase Migration: Why 4.6 Handles Multi-Million-Line Projects 2x Faster

The model can plan and execute massive projects, like moving millions of lines of code to a new system, in half the time it took older models.

Debugging & Refactoring: Catching Edge Cases that Opus 4.5 Missed

Opus 4.6 is much better at reviewing code and finding small “edge case” bugs that other models usually miss.

API & Developer Controls: Adaptive Thinking vs. Manual Budgeting

Thinking Modes: Why thinking: {type: “adaptive”} Replaces budget_tokens

Older models forced you to choose exactly how many “thinking tokens” to use. Opus 4.6 uses Adaptive Thinking, where the AI automatically chooses the right amount of depth based on the task.

The 4 Effort Levels: Fine-Tuning Intelligence vs. Speed/Latency

Developers can now choose from four levels: Low, Medium, High (Default), and Max. You can turn effort down to save money on simple tasks or turn it up to “Max” for the hardest logic problems.

128K Max Output: Generating Massive Documents in a Single Request

The output limit is now 128,000 tokens. This means the AI can write an entire book chapter or a huge technical manual in one single turn.

Enterprise Use Cases: Excel, PowerPoint, and the “Cowork” Environment

Claude in Excel: Planning, Structuring, and Multi-Step Financial Changes

Claude in Excel can now ingest messy data and figure out the right structure without being told what to do. It handles difficult financial modeling tasks 20% more accurately than before.

Research Preview: Building Brand-Consistent Decks with Claude in PowerPoint

In PowerPoint, Claude can read your brand fonts and layouts to create a full presentation slide deck based on a simple description.

Large-Scale Org Management: Managing 50-Person Organizations via Agentic Logic

In one test, Opus 4.6 successfully managed a 50-person organization across multiple code repositories, making product and organizational decisions on its own.

Safety & Alignment: The Most Robustly Aligned Frontier Model

Prompt Injection Resistance: 4.6 vs. The Industry Standard

Opus 4.6 is the most secure model against “prompt injection” attacks, where people try to trick the AI into doing something harmful.

Reducing “Over-Refusal”: How 4.6 Answers Benign Queries More Effectively

It has the lowest rate of over-refusal. This means it is less likely to say “I can’t help with that” when you ask it a perfectly safe and normal question.

Cybersecurity Probes: Six New Methods for Detecting Potential Misuse

Anthropic added six new “cybersecurity probes” to catch people trying to use the model’s coding skills for hacking.

Why You Need Both Claude 4.6 and ChatGPT 5.2 on GlobalGPT

Breaking the Subscription Silo: Access 100+ Models in One Dashboard

GlobalGPT removes the need to pay for 10 different AI accounts. You get 100+ models, including the full 2026 lineup, in one easy place.

Comparing the Titans: When to use Claude 4.6 (Agents) vs. GPT-5.3-Codex (Speed)

Use Claude 4.6 for complex planning, long memory, and multi-agent teams. Use GPT-5.3-Codex when you need extreme speed and integrated web-game development skills. On GlobalGPT, you can switch between them with one click.

The GlobalGPT Advantage: No Regional Restrictions & Flexible Pricing ($5.8/$10.8)

• $5.8 Basic Plan: Best for users who need all the top LLMs (Claude 4.6, ChatGPT 5.2) for text and research.
• $10.8 Pro Plan: Mandatory for creators who need Sora 2, Midjourney, and Kling for video and image work.
• 無障礙： No phone numbers or special cards needed—just log in and start working.

Pricing Breakdown: Is Claude Opus 4.6 More Expensive Than Opus 4.5?

Standard Token Costs: $5/Million Input vs. $25/Million Output

For most tasks, the price for Claude 4.6 is the same as Opus 4.5. You pay $5 for every million input tokens and $25 for every million output tokens. This is a great deal because Opus 4.6 is much smarter but costs the same for normal chats.

The “Premium” Threshold: Pricing for Prompts Exceeding 200K Tokens

The price only goes up if you use the massive 1 million token window. For any prompt that is larger than 200,000 tokens, you pay $10 for input and $37.50 for output per million tokens. While this is more expensive than Opus 4.5, the new model uses tokens more efficiently and finishes tasks with less help, which can save you money in the long run.

Data Residency: US-Only Inference and the 1.1x Price Multiplier

If you need your work to stay inside the United States for security, you can choose “US-only” inference. This option costs 1.1 times the standard price for Claude 4.6 for both input and output tokens.

Official Plans vs. GlobalGPT: Saving Your Money

If you sign up on the official website, the plans can be very expensive:

• 免費方案: $0, but has very low usage limits.
• 專業計劃: $20 per month, which gives you more usage and Claude in Excel.
• 馬克斯計劃： Starts at $100 per month, which is built for people who need 5x or 20x more usage than Pro.

GlobalGPT is the smartest choice because it is much cheaper and gives you more:

• Basic Plan ($5.8): You get full access to Claude 4.6, Claude 4.5, ChatGPT 5.2, and Gemini 3 Pro all in one place. You don’t have to pay for each one separately.
• Pro Plan ($10.8): This plan gives you the best text AI plus professional Video and Image tools like Sora 2 Flash, Midjourney, and Flux.

With GlobalGPT, you don’t have to worry about expensive $20 or $100 monthly bills. You get all the world’s best AI for a fraction of the cost.

Final Verdict: When Should You Stay with 4.5 and When to Upgrade to 4.6?

You should upgrade to Claude Opus 4.6 if you work with massive amounts of data, need to run complex autonomous agents, or are migrating large codebases. While Opus 4.5 is still a powerful model, the 1M token memory and Adaptive Thinking of 4.6 make it a far superior coworker for 2026.

GlobalGPT lets you use both Claude 4.6 and Opus 4.5 in one dashboard for a fraction of the cost.

References & Official Sources

This guide is synthesized from the latest official technical documentation and product announcements released in February 2026. For further technical deep-dives, you can visit the following primary sources:

• Anthropic Official Release: Introducing Claude Opus 4.6: Our Smartest Model Yet – Detailed breakdown of model capabilities and performance benchmarks.
• 技術文件： What’s New in Claude 4.6 – Official API implementation guide, including the new adaptive thinking 和 effort parameters.
• OpenAI Competition: Introducing GPT-5.3 Codex – Comparative specs for the simultaneous release of OpenAI’s latest coding-centric model.
• Engineering Case Study: Building a C-Compiler with Claude Agent Teams – A look at how Opus 4.6 handles 100,000+ lines of code autonomously.
• Live Demonstrations: Claude 4.6 Launch Reveal (X.com) – Real-world video demonstrations of Adaptive Thinking in action.