Anthropic’s Claude Opus 4.8 is its most honest AI model yet, and Mythos is coming in weeks
TL;DR
Anthropic has released Claude Opus 4.8, an upgrade to its flagship AI model that is four times less likely to let code flaws pass unremarked. The company also teased Mythos-class models, which have already found more than 10,000 critical software vulnerabilities through Project Glasswing, and announced a $65 billion Series H round at a $965 billion post-money valuation.
Anthropic has released Claude Opus 4.8, an upgrade to its flagship AI model that the company says is more honest, more reliable in agentic tasks, and better at catching its own mistakes. The model is available immediately at the same price as its predecessor, $5 per million input tokens and $25 per million output tokens, and is rolling out across all Anthropic products including claude.ai, Claude Code, and the API.
The headline improvement is honesty. Anthropic says Opus 4.8 is around four times less likely than Opus 4.7 to let...
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