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Anthropic has officially launched Claude Opus 4.8 with upgrades in coding, reasoning, and reliability. The company also hinted that more advanced Mythos-class AI models could arrive within weeks. The launch highlights growing competition among AI firms racing to build more capable AI systems.
Anthropic claimed that Opus 4.8 performs better than its predecessor on tests of coding, agentic skills, reasoning, and practical knowledge work tasks.
Anthropic has announced that it is upgrading its Claude Opus with a new version dubbed Opus 4.8. The company stated that the new model improves on Claude Opus 4.7 with better agentic coding capabilities, computer use, knowledge work, and more. Opus 4.8 is much less likely to do this and is better at pointing out possible mistakes in its own work. ‘One of the most prominent improvements in Opus 4.8 is its honesty,’ the company said in a blog post.
Another new feature is Dynamic Workflows for Claude Code. “Claude can plan the work and then run hundreds of parallel subagents in a single session (and with Opus 4.8, the agents can run for even longer). It then verifies its outputs before reporting back to the user,” the company explained.
According to the company, the model is also better at identifying flaws in code flaws and less likely to overlook problems. Anthropic’s internal testing found that Opus 4.8 is around four times less likely than its predecessor to leave coding issues unmentioned.
Claude Opus 4.8 is available globally starting today (May 29, 2026). Pricing remains unchanged from Opus 4.7: input tokens cost $5 per million, and output tokens cost $25 per million. Developers can access the model through the Claude API.
The company said it plans to release a new class of models with even higher intelligence than Opus. “As part of Project Glasswing, a small number of organizations are currently using Claude Mythos Preview for cybersecurity work. Models at this capability level require stronger cyber safeguards before they can be released more broadly. We’re making swift progress on developing these safeguards and expect to be able to bring Mythos-class models to all our customers in the coming weeks,” Anthropic said.
Also Read: How to Automate Your Job Search Using Claude Cowork
The company has also introduced a new effort control option on Claude. ai and Cowork. This lets users decide how much thinking time Claude should spend on a task. Higher effort settings can produce better answers, while lower settings provide faster responses and use fewer resources.
Anthropic is focusing on safer, more reliable, and smarter AI systems. With Claude Opus 4.8 and upcoming Mythos models, the company is competing with major AI players while improving trust, coding ability, and real-world performance for users.
