I fully agree with Andrew. I cannot imagine， under any circumstances， that Anthropic released Opus 5 without already having a better model for the "fable" tier in-house.

The question， of course， is why it hasn't been released. Yet the answer is very simple if you open your eyes： the competition between OpenAI and Anthropic is fiercer than ever. GPT-5.6 was a resounding success， and Codex-with its current 10 million active professional users- is gaining increasing importance in a sector primarily dominated by Anthropic.

Anthropic is holding off on the launch of fable 5.1 until OpenAI releases GPT-6， and that won't be long now. Axios reported that Sam Altman is briefing the White House on the new model next week， so it is essentially ready to launch.