Introducing Claude Opus 4.5: the best model in the world for coding, agents, and computer use. Opus 4.5 is a step forward in what AI systems can do, and a preview of larger changes to how work gets done.
Claude on X: "Introducing Claude Opus 4.5: the best model in the world for coding, agents, and computer use. Opus 4.5 is a step forward in what AI systems can do, and a preview of larger changes to how work gets done."
Our engineers have found that Opus 4.5 handles ambiguity and reasons about tradeoffs without hand-holding. When pointed at a complex, multi-system bug, it figures out the fix. Overall, Opus 4.5 just "gets it."
We’re also releasing new product features across our model line-up. For Claude app users, long conversations no longer hit a wall. Claude automatically summarizes earlier context as necessary, so you can keep the chat going indefinitely.
New on the Claude Developer Platform: tool search, programmatic tool calling, and tool use examples. Together with effort control and context compaction, these let Claude run longer and do more with less intervention. Read more: anthropic.com/engineering/ad…
Claude Code is now available in our desktop app. Run multiple sessions in parallel: code, research, and update work all at once. And Plan Mode gets an upgrade with Opus 4.5—Claude asks clarifying questions upfront, then works autonomously.
We’ve also expanded Claude for Chrome to all Max plan users.
Grok might do better with v4.20. We shall see.