Claude Opus 4.8 arrives with faster mode, better reasoning, and Claude Code updates

Anthropic has launched Claude Opus 4.8, its latest model upgrade less than two months after the previous release. Pricing for standard usage remains unchanged from Claude Opus 4.7.

Opus 4.8 brings better collaborative performance, sharper judgment, and a stronger ability to work independently for longer tasks. Anthropic says the model is also more likely to express uncertainty and avoid unsupported claims, with early testers reporting more transparency around progress and fewer guesses presented as facts. Benchmark scores improved across several areas, including agentic coding from 64.3% to 69.2%, multidisciplinary reasoning from 54.7% to 57.9%, and knowledge work from 1753 to 1890.

The update also revamps fast mode, which Anthropic says is roughly 2.5 times quicker and three times less expensive. Claude Code is getting higher rate limits and new effort controls, including extra and max performance settings for harder tasks, while dynamic workflows enter research preview for larger coding projects. Developers also get Messages API support for mid task instruction updates using system entries in the messages array, and Anthropic says its cybersecurity focused Mythos model will become available to all users in the coming weeks.