Claude Opus 4.6

1M token context window AI with agentic capabilities

chatno code

Overview

Claude Opus 4.6 represents a major advancement in context handling, allowing users to work with significantly longer documents and projects without performance degradation. The model features agentic capabilities for autonomous task execution, direct Excel integration for spreadsheet interpretation, and PowerPoint integration in research preview. It tracks long projects, reviews its own work, and coordinates parallel agents.

Best For

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+developers
+researchers
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News & Updates

Ask HN: At ~165k tokens, does Claude Opus 4.6 1M outperform Opus 4.6 200k?

Here is the question for which I cannot find an answer, and cannot yet afford to answer myself:In Claude Code, I use Opus 4.6 1M, but stay under 250k used tokens via careful session management to avoid known NoLiMa [0] / context rot [1] crap. The question I keep wanting answered though: at ~165k tokens used, does Opus 1M actually deliver higher quality than Opus 200k? (I used ~165k to account for token buffer, and other stuff, but in theory, it may as well be ~195k, the point is - at the

BREAKTHROUGHS4/15/2026

Show HN: Signoff.sh – Claude Co-Authored-By with random fictional characters

Every Claude Code commit and PR is shipped with Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> (or similar). It's less fun than I think it should be. So signoff.sh is a 40-line bash script that replaces it with a random fictional character's full legal name - as best as I could figure out :)Preserves the model name and the Anthropic noreply email, so you still get transparency about AI coding.It's silly and that's the point.I'm also a fan of peon

BREAKTHROUGHS4/14/2026

Ask HN: What's the best AI model for system design nowadays?

I'm specifically asking about software system design tasks like:Designing backend architectures Tradeoff analysis (DB, queues, caching, others) Infra diagrams DocumentationMy current pick would be Claude Opus 4.6, because I've found it strong at structured reasoning and long contextBut I'm curious what others are using today

BREAKTHROUGHS4/13/2026

New Zero-Identity Messaging App Uses Physics-Based Post-Quantum Encryption

Show HN: Zero-identity messaging app with physics-based post-quantum encryption (Layer 2 from my own paper)Hey HN,I'm building a privacy-first messaging app in Flutter/Dart, developed with AI assistance (Gemini 2.5 Pro + Claude Opus 4.6). No phone number, no email, no account — no identity, nothing to track. Currently focused on Android.*Six-layer defense architecture*Layer 0 - Identity layer: Zero identifier. No account, no identity, nothing to track.Layer 1 - Key excha

BREAKTHROUGHS4/13/2026

Claude Opus 4.6 accuracy on BridgeBench hallucination test drops from 83% to 68%

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BREAKTHROUGHS4/12/2026

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