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Anthropic's new Mythos-class Fable 5 (80.3% SWE-bench Pro, $50/1M) vs the outgoing flagship Opus 4.8 (69.2%, $25/1M). Fable 5 dominates every benchmark — but costs 2× more, hallucinates more, and sometimes falls back to Opus 4.8 anyway. Full 30-benchmark comparison.
Interactive pricing calculator comparing 29 AI coding models. Enter monthly tokens, adjust input/output ratio, toggle caching. Claude Fable 5 added at $10/$50. Updated June 9, 2026.
17 budget AI coding models ranked by output price ($0.28–$5.00/1M), SWE-bench Pro scores, and real-world CodingFleet speed. DeepSeek V4 Flash cheapest ($0.28). MiniMax M3 best open-weight (59.0% Pro). GPT-5.4 Mini fastest (439.8 char/s). Complete value-per-dollar analysis.