Gemini 3.5 Pro vs GPT-5.6 vs Claude Fable 5: which wins in 2026 (real benchmarks)

Gemini 3.5 Pro vs GPT-5.6 vs Claude Fable 5: which wins in 2026 (real benchmarks) Summary. As of 18 July 2026, two of these three models are real and one is a rumour. OpenAI shipped the GPT-5.6 family