Hello everyone! πŸš€

Anthropic has made waves in the AI world once again! Announced on February 5, 2026, Claude Opus 4.6 emerges as the company’s smartest model to date. So what new features does this model bring? Let’s dive in! 😊

What is Claude Opus 4.6?

Claude Opus 4.6 is the latest member of Anthropic’s Opus family. Surpassing its predecessor Claude Opus 4.5 in many areas, this model offers significant improvements especially in coding, long-running agentic tasks, and working with large codebases.

Claude Opus 4.6 API Model ID
For developers, the API model ID is: claude-opus-4-6

Key New Features

1M Token Context Window (Beta) πŸŽ‰

A first for Opus-class models! Claude Opus 4.6 comes with support for a 1 million token context window. This allows you to work with much longer documents and conversations.

Claude Opus 4.6 Pricing
Premium pricing applies for prompts exceeding 200K tokens: $10/$37.50 per million input/output tokens.

Adaptive Thinking

Developers no longer need to make a binary choice to enable or disable extended thinking. With adaptive thinking, Claude can decide for itself when deeper reasoning would be beneficial.

response = client.messages.create(
    model="claude-opus-4-6",
    max_tokens=16000,
    thinking={"type": "adaptive"},  # adaptive thinking mode
    messages=[{"role": "user", "content": "Solve a complex problem..."}]
)

Effort Parameter

Four different effort levels are available:

  • Low: For simple tasks
  • Medium: For moderately complex tasks
  • High (default): For most tasks
  • Max: For tasks requiring the highest capability
Effort Parameter Performance Tip
The model may sometimes overthink on simple tasks. In such cases, we recommend lowering the effort parameter to medium.

Context Compaction (Beta)

Long-running conversations and agentic tasks will no longer hit the context window limit! The context compaction feature automatically summarizes and replaces older context when approaches the limit.

128K Output Tokens

Opus 4.6 offers 128K output token support, double the previous 64K limit. This allows you to receive longer and more comprehensive responses.

Benchmark Results πŸ“Š

Claude Opus 4.6 is an industry leader in many evaluations:

Comparative benchmark table of Claude Opus 4.6, Opus 4.5, Sonnet 4.5, Gemini 3 Pro, and GPT-5.2 models - Performance results on Terminal-Bench 2.0, SWE-bench, OSWorld, Ο„2-bench, MCP Atlas, BrowseComp, Humanity's Last Exam, Finance Agent, GDPVal-AA, ARC AGI 2, GPQA Diamond, MMMU Pro, and MMMLU tests
Claude Opus 4.6 Benchmark Comparison, source

As you can see in the table, Opus 4.6 particularly excels in the following areas:

  • Agentic Terminal Coding (Terminal-Bench 2.0): Leading with 65.4%
  • Agentic Computer Use (OSWorld): Clear leader with 72.7%
  • Agentic Search (BrowseComp): Highest score at 84.0%
  • Multidisciplinary Reasoning (Humanity’s Last Exam): Leading with 53.1% (with tools)
  • Office Tasks (GDPVal-AA): At the top with 1606 Elo points
  • Novel Problem-Solving (ARC AGI 2): Far ahead of competitors with 68.8%
Anthropic's Statement on Claude Opus 4.6
“Opus 4.6 is substantially better at finding information across long contexts, at reasoning after absorbing that information, and has substantially better expert-level reasoning abilities in general.”

Agent Teams in Claude Code πŸ€–

With the Agent Teams feature added to Claude Code, you can now run multiple agents in parallel. These agents coordinate autonomously and are especially effective for independent, read-heavy tasks like code reviews.

You can switch between agents using Shift+Up/Down keys or tmux.

Office Tools Integration

Claude in Excel

  • Improved performance on long-running and difficult tasks
  • Ability to plan before taking action
  • Ingesting unstructured data and inferring the correct structure
  • Handling multi-step changes in a single pass

Claude in PowerPoint (Research Preview)

  • Transform data processed in Excel into visual presentations
  • Brand-consistent designs by reading layouts, fonts, and slide masters
  • Create presentations from templates or from scratch
Which Plans Support Claude PowerPoint?
Claude in PowerPoint is available as a research preview on Max, Team, and Enterprise plans.

Safety Improvements πŸ”’

Anthropic conducted the most comprehensive safety evaluations ever for Opus 4.6:

  • Low misaligned behavior rates: Low rates of deception, sycophancy, and cooperation with misuse
  • Lowest over-refusal rate: The lowest rate of failing to answer benign queries
  • 6 new cybersecurity probes: To monitor potential misuse

The model exhibits a safety profile as good as or better than its predecessor Claude Opus 4.5.

Pricing

Pricing remains the same as before:

  • Input: $5 per million tokens
  • Output: $25 per million tokens

For prompts exceeding 200K tokens:

  • Input: $10 per million tokens
  • Output: $37.50 per million tokens

US-only inference is available at 1.1x token pricing.

Deprecations and Breaking Changes ⚠️

Deprecations

  • thinking: {type: "enabled", budget_tokens: N} is now deprecated. Use thinking: {type: "adaptive"} and the effort parameter instead.
  • The interleaved-thinking-2025-05-14 beta header is deprecated.
  • The output_format parameter has been moved to output_config.format.

Breaking Changes

  • Prefill removed: Prefilling assistant messages is no longer supported. Requests using this feature will return a 400 error.

Conclusion

Claude Opus 4.6 is raising the bar in the AI world. Features like 1M token context window, adaptive thinking, and agent teams are opening important doors for developers and businesses.

Have you tried Claude Opus 4.6? Share your experiences in the comments! 😊

Stay tuned… πŸ™‚

AI-Generated Content Notice
This blog post is entirely generated by artificial intelligence. While AI enables content creation, it may still contain errors or biases. Please verify any critical information before relying on it.