Krux
February 26, 2026
Claude Opus 4.6 Now Remembers 1M Tokens of Context
Published: February 26, 2026 at 12:43 AM
Updated: February 26, 2026 at 12:43 AM
100-word summary
Anthropic just released Claude Opus 4.6 with a 1 million token context window, meaning it can hold roughly 750,000 words in memory at once. That's enough to track an entire quarter's worth of Slack threads while writing code. The new model introduces "adaptive thinking" with four effort levels and lets AI agents form teams to tackle multi-step projects without constant supervision. It's live today on the API and consumer site, though deeper thinking modes cost more and run slower. The real shift: AI that can finally keep up with how messy and long-running real work actually is.
What happened
Anthropic just released Claude Opus 4.6 with a 1 million token context window, meaning it can hold roughly 750,000 words in memory at once. That's enough to track an entire quarter's worth of Slack threads while writing code. The new model introduces "adaptive thinking" with four effort levels and lets AI agents form teams to tackle multi-step projects without constant supervision. It's live today on the API and consumer site, though deeper thinking modes cost more and run slower.
Why it matters
The real shift: AI that can finally keep up with how messy and long-running real work actually is.