In a move that shocked absolutely no one, Anthropic has released Claude Opus 5. After dropping the controversial Mythos 5 and Fable 5 last month, and Sonnet 5 on July 1, it was only a matter of time before Opus got bumped from 4.8 to 5. That time is today.

Opus 4.8 has been a solid workhorse for many, handling large coding projects with aplomb. But early reports suggest Claude Code is about to get another big boost. Stripe software engineer Cristian Rivera gushes: "Opus 5 is a clear generational step up from Opus 4.8. Over one weekend, I gave it a chief-of-staff role over my dev environments: it built its own monitor, drove each box, and pulled me in only for the judgment calls." Harvey, the AI legal tools company, also saw gains, particularly in corporate governance and arbitration. Niko Grupen, Harvey's head of applied research, notes Opus 5 achieves similar performance while generating 26% fewer tokens on average compared to Opus 4.8 at max reasoning. Fewer tokens mean less stress and longer sessions - a welcome change for those whose Claude Code has requested recesses mid-task.

Anthropic claims Opus 5 "comes close to the capabilities of Claude Fable 5 in many domains at half the price." It boasts the strongest knowledge work performance of any model they've released, with substantial gains in complex coding. Cursor co-founder Sualeh Asif confirms: "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."

For enterprise users, Opus 5 is expected to be the daily driver. The pricing remains the same as Opus 4.8: $5 per million input tokens and $25 per million output tokens for API users. For Claude Max subscribers, it's the default model with standard limits. The author, who has been hammering Opus 4.8 on a $100/month plan, reports only 31% usage for the week - suggesting Opus 5 might offer even more runway.

Beyond knowledge work, Opus 5 offers greater autonomy, better error recovery, and more frequent self-checks. Anthropic also highlights its performance on biology tasks, though they haven't defined "overperformed" - presumably meaning better, faster, and cheaper. For those truly ambitious projects, Anthropic still recommends Fable 5 for "days-long autonomous projects nothing could take on before."

In related news, Opus 5 is available now to all user tiers that previously had access to Opus 4.8. The company also made a series of other announcements, but honestly, you're probably here for the AI model.