
Anthropic has officially launched Claude 4, introducing two upgraded models, Claude Opus 4 and Claude Sonnet 4, that raise the bar for performance in AI, especially in software development and complex reasoning.
Claude Opus 4: A Programming Powerhouse
Positioned as Anthropic’s most capable model yet, Claude Opus 4 is being hailed as the strongest AI tool for programming tasks.
According to the company, it demonstrated the ability to operate autonomously for over seven hours in real-world conditions with enterprise clients, a benchmark that sets it apart from previous generations.
Beyond endurance, Opus 4 has outperformed rival models such as GPT-4.1 and Gemini 2.5 in programming-specific benchmarks like SWE-bench and Terminal-bench.

Several technology companies that tested Opus 4 on actual projects, including Replit, Block, and Rakuten, indicated that the model contributed to improving code quality during editing and correction processes.
It also exhibited superior performance in handling complex instructions and multi-step scenarios.
Introducing Claude Sonnet 4
Alongside Opus, Anthropic has released Claude Sonnet 4, a refined evolution of the previous Sonnet 3.7 model.
While it doesn’t boast the raw power of Opus, Sonnet 4 has been optimized for consistency, instruction-following, and accurate code generation.
GitHub has already adopted Sonnet 4 as part of its new Copilot agent, leveraging its strengths in project-level execution and architectural analysis.
Early testers have noted its reduced error rate when navigating large codebases and handling complex cross-file logic.
Enhanced Thinking Capabilities: Summaries and Web Integration
Both models come with enhanced cognitive features.
A standout is “Thinking Summaries,” which transparently shows how the model arrived at its conclusions. Ideal for users who want insight into AI logic without reading lengthy explanations.
In beta, Anthropic is also testing an “Extended Thinking” mode. This feature enables the model to tap into external tools, like web search, when additional information is needed. This makes it more capable of tackling research-heavy or dynamically changing queries.
Long-Term Memory and Local File Context
A notable upgrade is the ability to create “Memory Files.”
These allow the models to retain context over extended sessions and across documents, helping teams manage long-term projects or repeatedly referenced codebases.
Developers can now feed local files directly into Claude, making it more context-aware than ever before.
Claude Code: Developer-Focused Tooling
To complement the model upgrades, Anthropic has launched Claude Code, a new environment that embeds Claude directly into IDEs such as VS Code and JetBrains.
This tight integration gives developers real-time coding suggestions and enables seamless code reviews.
There’s also support for GitHub Actions, allowing Claude to run automated tasks in CI/CD pipelines.
Additionally, Anthropic released a dedicated SDK for building custom AI agents that plug into existing developer workflows.
Access Methods
Claude Opus 4 and Sonnet 4 are now available via the Anthropic API, as well as through Amazon Bedrock and Google Cloud's Vertex AI. Explore Access ways.
Pricing remains consistent: Opus 4 starts at $15 per million input tokens, while Sonnet 4 costs $3 per million.
According to Anthropic, Opus 4 is designed to lead in areas like programming research, scientific analysis, and the generation of highly complex content.
Sonnet 4, meanwhile, is tailored for advanced daily usage in organizational workflows and individual projects, serving as a direct upgrade for most existing users.
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