Anthropic Releases Claude Opus 4.8 Model

Anthropic has released its latest AI model with Claude Opus 4.8. The new version arrives less than two months after the previous model upgrade, ramping up Anthropic’s upgrade cadence.

Anthropic describes Claude Opus 4.8 as a more effective collaborator. The company says the model features sharper judgement, more honesty about its progress, and the ability to work independently for longer than its predecessors.

Early testers report that Opus 4.8 is more likely to flag uncertainties about its work and less likely to make unsupported claims, according to Anthropic.

The company notes that pricing remains the same between Claude Opus 4.7 and Opus 4.8. Anthropic shared multiple benchmarks comparing the two models.

The agentic coding score increases from 64.3% to 69.2%. Multidisciplinary reasoning with tools jumps from 54.7% to 57.9%. Agentic computer use moves from 82.8% to 83.4%. The knowledge work score increases from 1753 to 1890. Agentic financial analysis improves from 51.5% to 53.9%.

Anthropic says Opus 4.8 fast mode is roughly 2.5 times quicker now. The upgraded fast mode also costs three times less than before, the company says.

Claude Opus 4.8 will use high effort by default, which Anthropic says spends similar tokens to Opus 4.7 on coding tasks with better performance. The company is increasing Claude Code rate limits to fit extra and max performance settings as well.

Users can choose “extra” (“xhigh” in Claude Code) or “max,” and the model will spend more tokens to get better results. Anthropic recommends using “extra” for difficult tasks and long-running asynchronous workflows. The company has increased rate limits in Claude Code to accommodate the higher token usage of higher effort levels. Users can select whichever makes sense for their particular project.