Claude Opus 4.8 Review: A Lateral Move With A Big Token Appetite

Six weeks after Opus 4.7, Anthropic shipped Claude Opus 4.8. The benchmarks are up, the safety scores are up, and the price hasn't budged from $5 per million input tokens and $25 per million output. So we ran it through the same battery of tests we throw at every frontier model—creative writing, coding, math, logic, narrative reasoning, and long-context recall—and compared it head-to-head with its own predecessor and the Chinese models that keep undercutting it.

The short version: 4.8 is better at the things Claude was already good at (things like math, coding, mechanical stuff), and slightly worse at the things it was already bad at (things like imagination, creative writing, etc). It also has a token appetite that borders on self-sabotage.

The prompt is the same one we used on MiMo and Qwen: a time-travel story anchored to the writer's cultural background, set in a specific historical place, built around a paradox where time can't be changed. Opus 4.8 went Venezuelan, probably because it profiles the user and knows I'm from Venezuela.

The AI set the scene in the Orinoco delta in the year 1000, a pardo from Maracaibo named José Lanz (my name) sent back through 11 centuries to murder a song. The prose is vivid. The delta is "green in a way 2150 had forgotten green could be," palafitos sway over coffee-colored water, and macaws tear across the sky "in screaming ribbons of scarlet and gold."

The paradox lands cleanly, too: the protagonist is sent to sabotage the creation of a song that influenced a cultural revolution that created his dystopian society thousands of years in the future—however, as he arrives with the mission to discredit the song's author, he realizes there is no author. The one who created the song did it in his honor, the song is about him, and he cannot discredit himself, the loop closing on itself. The piece ends on "It worked perfectly. It always had."

As a built object, it's clean and competent. But clean isn't the same as alive. The writing is