The mid-tier won. Most builder cost models are still pricing for the frontier.
GPT-4-class inference has dropped roughly 95% in API cost since 2023. Mistral Medium 3.5 at $1.50/M and DeepSeek V4 under $1/M are genuinely competitive with 2024 frontier models on most production workloads. The decision is no longer 'can we afford AI.' It's 'are we routing traffic to the right tier.'