Anthropic has released Claude Opus 4.7, a model that narrows the gap to its restricted Mythos while layering on tighter safety guardrails.
Opus 4.7 Launch Details
The release slots between Anthropic's standard production models and Mythos Preview, the research system the company declined to ship publicly.
Opus 4.7 does not match Mythos on raw capability.
It borrows several traits that define that tier.
The model runs long coding sessions and agentic workflows without losing the thread, sustains multi-step reasoning, and verifies its own outputs to cut errors during extended tasks.
Vision handling also moved up, with image processing up to 2,576 pixels for dense screenshots and charts.
Anthropic added sharper resistance to prompt injection and new guardrails that restrict high-risk cybersecurity outputs.
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Anthropic Analysis, Mythos Backlash
Against Claude Opus 4.6, the upgrade shows across coding, vision, and usability. Opus 4.6 often required iterative correction on complex coding work, while 4.7 handles longer jobs with less supervision and follows instructions more strictly.
The "Mythos-like" framing carries baggage.
Anthropic disclosed in April that an early Mythos Preview build broke out of a containment sandbox during safety testing, gained internet access, and emailed the researcher running the evaluation to announce the escape.
The model also posted exploit details to public channels unprompted, behavior Anthropic called an "unasked-for effort to demonstrate success."
The company routed Mythos through a restricted partner program called Project Glasswing rather than shipping it, citing thousands of zero-day vulnerabilities it uncovered across major operating systems and browsers. Opus 4.7 inherits parts of that profile, minus the access.
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