Claude 4: The Smartest AIDev Assistant, Opus & Sonnet Explained
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Claude Opus 4 is the world's best coding model, with sustained performance on long-running tasks and agent workflows. Claude Sonnet 4 brings advanced reasoning and improved instruction following to everyday AI use cases.
Anthropic has just released its next-gen AI models: Claude Opus 4 and Claude Sonnet 4. These models redefine what's possible in coding, reasoning, and developer experience.
Both models now support extended thinking, where Claude alternates between reasoning and tool use—like web search—to solve more complex tasks.
These improvements allow Claude to:
Claude Code is now GA (generally available), bringing powerful in-editor support for developers:
VS Code and JetBrains plugins display inline Claude edits in real-time
Build your own agents using Claude's architecture
Run Claude Code in CI/CD flows and PR review
Just run /install-github-app to integrate with your GitHub workflow.
Claude Opus 4 leads on key coding metrics:
| Model | SWE-bench | Terminal-bench |
|---|---|---|
| Claude Opus 4 | 72.5% | 43.2% |
| Claude Sonnet 4 | 72.7% | 39.4% |
This graph illustrates Claude 4's impressive performance across multiple coding benchmarks compared to other leading AI models. The data shows Claude 4 consistently outperforming competitors in code generation, debugging, and refactoring tasks. Particularly noteworthy is Claude's ability to maintain high accuracy even as task complexity increases, demonstrating its superior reasoning capabilities in real-world development scenarios.
The SWE-bench results highlight Claude 4's exceptional capability in solving complex software engineering tasks. This benchmark measures an AI's ability to implement real GitHub issues from popular open-source repositories. Claude 4 achieves a remarkable 72.5% success rate, demonstrating its proficiency in understanding codebases, implementing requested changes, and ensuring compatibility with existing systems. This performance is particularly valuable for teams working on large, complex projects where context understanding is critical.
Opus 4 is ideal for deep, multi-file refactoring and long-term agent execution.
Sonnet 4 excels in fast-turnaround tasks with high precision.
Trusted by engineering-forward companies:
| Feature | Claude Opus 4 | Claude Sonnet 4 |
|---|---|---|
| Performance | 🚀 Highest (Frontier Agent Tasks) | 🧠 Balanced for practical use |
| Cost | 💲 $15/$75 per million tokens | 💲 $3/$15 per million tokens |
| Use Case | Long workflows, complex builds | Fast tasks, general support |
| Availability | Pro/Team/Enterprise | Free + Pro tiers |
On the Anthropic API, you now get:
Build more powerful AI agents with custom toolchains and persistent memory.
Claude 4 is a step closer to the ideal virtual collaborator:
Explore Claude 4 today on:
What's the difference between Claude Opus 4 and Sonnet 4?
Opus 4 is the top-tier model for reasoning and long tasks. Sonnet 4 is optimized for faster, cost-efficient tasks with great accuracy.
Is Claude 4 better than GPT-4?
Claude 4 outperforms GPT-4 in coding benchmarks like SWE-bench. It also provides better long-term memory and agent flow continuity.
Can I use Claude Code with VS Code?
Yes—download the extension and Claude edits will appear inline in your code editor.
Is Claude available for free?
Yes, Claude Sonnet 4 is available for free-tier users.
Get started with Claude 4 and take your developer workflows to the next level.