Anthropic's Internal "Model 2" Leaked, Outperforms Mythos 5
koltregaskes · x · 2026-08-17
Anthropic's new Risk Report mentions an unreleased internal model referred to as "Model 2".
Key Facts:
- Capability: Described as "somewhat more capable than Mythos 5" and noticeably better than MythoMax and 4.0-Snapshot.
- Benchmark: Achieves a score of 86.7% on MMLU (5-shot, MMLU-Pro).
- Status: One of Anthropic's most capable and commonly used internal models, with no current plans for external release.
- Speculation: Model 2 is likely a fine-tuned or specific deployment of Claude 3.6 Sonnet, or an intermediate product of continuous training on a new architecture.
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