Claude API vs OpenAI for Business Automation: What Actually Decides It in 2026

Description and use

<blockquote> <p>Short version: the context window stopped being the deciding factor. Both families now ship a million-token window, so the choice moved to three things you only feel in production - how reliably the model returns the shape you asked for, what your bill looks like once caching is on, and how much of your system is already welded to one vendor. Prices below were checked on 10 September 2026 and they move; treat them as a shape, not a quote.</p> </blockquote> <p>I run 2pizza.team. We are an official Anthropic partner and we also ship systems on OpenAI, because clients arrive with

Problem

<blockquote> <p>Short version: the context window stopped being the deciding factor. Both families now ship a million-token window, so the choice moved to three things you only feel in production - how reliably the model returns the shape you asked for, what your bill looks like once caching is on, and how much of your system is already welded to one vendor. Prices below were checked on 10 September 2026 and they move; treat them as a shape, not a quote.</p> </blockquote> <p>I run 2pizza.team. We are an official Anthropic partner and we also ship systems on OpenAI, because clients arrive with

Outcome

<blockquote> <p>Short version: the context window stopped being the deciding factor. Both families now ship a million-token window, so the choice moved to three things you only feel in production - how reliably the model returns the shape you asked for, what your bill looks like once caching is on, and how much of your system is already welded to one vendor. Prices below were checked on 10 September 2026 and they move; treat them as a shape, not a quote.</p> </blockquote> <p>I run 2pizza.team. We are an official Anthropic partner and we also ship systems on OpenAI, because clients arrive with

Evidence

Claude API vs OpenAI for Business Automation: What Actually Decides It in 2026

Source