Anthropic’s Model 2 Beats Mythos 5, But the Public Will Not Get It

Anthropic has disclosed an internal artificial intelligence (AI) model called Model 2 that outperforms Claude Mythos 5 on many tasks. The company said it has no plans to release it publicly.

The disclosure appears in Anthropic's August 2026 risk report, the second filing of its kind. The same document raised the company's rating for catastrophic misalignment risk.

Model 2 Outperforms Mythos 5 on Internal Tasks

Model 2 belongs to the Mythos class, Anthropic's highest capability tier. The report describes it as a noticeable improvement on Mythos 5 for many tasks relevant to internal work.

The gain falls short of the earlier leap from Claude Opus 4.6 to Mythos Preview. Model 2 proves stronger in some areas and weaker in others.

Anthropic has not run its full suite of predeployment assessments on the model. Confidence in its capability profile is therefore lower than for released systems.

Both Model 2 and Mythos 5 rank among the most heavily used models inside the company. Engineers apply them to coding, data generation and agentic tasks.

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