wake up Anthropic just dropped a new model Anthropic launched Fable 5.1 alongside Mythos 5.1 today. They use the same underlying model, but have different safeguards. Only Fable 5.1 is generally available. High level stats: 1M token context window, 128K max output, June 2026 knowledge cutoff Biggest improvements (according to Anthropic): long-running coding, scientific research, computer use, document creation, and complex workflows involving multiple tools Improved Benchmark results (vs. Fable 5): Terminal-Bench-Science: 52.6% vs 24.7% Terminal-Bench 4.0: 55.8% vs 42.0% AutomationBench: 31.4% vs 17.1% GDPval-AA: 1,853 vs 1,723 CursorBench: 73.4% vs 70.5% OSWorld strict: 41.7% vs 36.1% Worse Benchmark results: ARC-AGI-1: 97.5%, slightly below Fable 5 at 98.5% ARC-AGI-2: 90.0%, below Opus 5 at 90.42% and GPT-5.6 Sol at 92.5% SWE-bench Multimodal: 54.7%, below Opus 5 at 59.4% HealthBench Professional: 62.1%, slightly below Fable 5 at 63.3% Base pricing is unchanged: Input: $10 per million tokens Output: $50 per million tokens 5-minute cache writes: $12.50 per million tokens 1-hour cache writes: $20 per million tokens The major change is cache reads: $1.00 → $0.25 per million tokens And most excitingly, approximately 60% fewer cyber-safeguard interventions per Claude Code session