Key takeaways
What happened
To the surprise of no one, Anthropic has released Claude Opus 5. 8 to 5. That's happening today. 8. I've been using it for a number of large coding projects, and it's handled them quite well. But based on limited user reports, it's likely that Claude Code will get another big boost. I'm not the only one impressed with Opus, based on the accolades included in Anthropic's announcement. 8.
While Opus 5 is better for knowledge work (that's kind of table stakes for a major version upgrade), it also offers greater autonomy with less back-and-forth, better error recovery, and more frequent checks of its work. What I find particularly interesting is that Anthropic is again mentioning how Opus is helping with biology and other scientific research. 8. 8.
Why it matters
" Harvey creates AI legal tools. " Token use isn't just a measure of cost. It's also a measure of how much stress the AI is handling while it's working on complex issues. 8's million-token context window, that my Claude Code has requested a recess and to take time to nap. Using fewer tokens for the same work means it might go farther in a given session.
That would be helpful. " The company reports that it has the strongest knowledge work performance of any model it's released, and delivers substantial gains on complex coding. These two would go directly to improve work in both Claude Cowork and Claude Code. AI development vendor Cursor supports the assessment that Opus 5 is nipping at the heels of Fable 5 in terms of capabilities.
Cursor co-founder Sualeh Asif reports, "Claude Opus 5 delivers near Fable 5 intelligence at Opus speed and cost. On CursorBench, it's just under Fable 5 and has many of the same behaviors. " Anthropic says it expects Opus 5 to be the daily driver, especially in the enterprise. 8 on my $100/month Claude Max plan and haven't experienced throttling.
I spent the last week putting it through a lot of big agentic runs and am still at only 31% of my usage limit for the week, which resets later today. Presumably, I'll move to Opus 5 as my go-to model and will probably have even more runway to accomplish complex tasks.
What to watch
For token API users, it's $5 per million input tokens and $25 per million output tokens. " I'm getting ready to add the in-app purchase wiring for my iPhone and Mac apps, and I'm thinking I might assign that big (and scary) project to Fable to see what it can do for me. The company is also making a series of related announcements today. Here's a quick lightning round. 8.
Would you use Claude Opus 5 as your daily AI coding model? Let us know in the comments below. You can follow my day-to-day project updates on social media. com/DavidGewirtzTV.