OpenAI's Codex has achieved 10 million paying users, many on the Pro tier, signaling a direct move into Anthropic's established B2B and enterprise market segment. This competitive pressure has reportedly influenced Anthropic's decision to keep its Fable 5 model included in the Max tier subscription plan.
OpenAI's aggressive enterprise push with Codex forces Anthropic to adjust its model tiering, intensifying competition for high-value AI customers.