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ProPakistani
Anthropic's Secret Model is Even Better Than Mythos 5 But You Won't Get It
Anthropic has revealed an internal AI model, Model 2, which it claims is more capable than the previously released Claude Mythos 5, based on their internal benchmark, CoBench v2. Model 2 achieved a score of 62.8%, surpassing Mythos 5's 50.3%. Although this model offers noticeable improvements for internal tasks, it has not undergone full predeployment assessments, keeping it from external release. The company is not currently planning to launch this model publicly, emphasizing cautious deployment practices and addressing operational concerns.
MonitorConfidence: MediumMid term horizon
Published 21 Aug 2026, 15:55 UTC1 min read
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Summary
TL;DR
- Anthropic has developed an internal AI model called Model 2
- Model 2 scores 62.8% on Anthropic's CoBench v2 benchmark
- This score outperforms both Mythos 5 and Mythos Preview
- Model 2 remains unreleased externally due to incomplete assessments
- The model significantly aids internal tasks but is not fully evaluated
Interesting facts
- Model 2 is categorized as a near-frontier AI model
- Internal usage includes coding, data generation, and AI deployments
- Anthropic has ongoing concerns over misalignment risks