GPT-5.6 Sol vs Claude Fable 5: Which Should Builders Pick?
OpenAI's GPT-5.6 Sol undercuts Claude Fable 5 at $5/$30 per million tokens against $10/$50, with a slightly larger 1.05M-token context window. But Fable 5 leads the third-party coding boards OpenAI no longer reports to, including an 80.3% vs 64.6% SWE-bench Pro result per BenchLM's July 2026 tracking. Fable also carries a fresh scar: an export-control suspension that ended July 1. For PMs, the switching decision comes down to cost per token versus cost per solved task — and whether your architecture keeps the choice reversible.