Anthropic tops OpenAI adoption

Ramp said on May 13 that Anthropic had passed OpenAI in paid business adoption on its AI Index for the first time, with 34.4% of participating businesses paying for Anthropic services and 32.3% paying for OpenAI. The index is based on Ramp customers’ corporate card and bill-pay transactions, according to the company. Overall AI adoption across the businesses tracked by Ramp rose 0.2 percentage points to 50.6%, the company said. (ramp.com) OpenAI, meanwhile, has posted a detailed Codex rate card showing how usage is billed across Plus, Pro, Business, Enterprise, Edu, Health and Gov plans. (help.openai.com) The two disclosures landed a day apart and offered a snapshot of how enterprise AI buying is being measured and priced. Ramp’s update focused on which vendors businesses are paying. OpenAI’s documentation laid out token-based credit rates for coding work, code review and related usage under Codex. ### How big was Anthropic’s lead in Ramp’s latest reading? Ramp economist Ara Kharazian wrote that Anthropic’s adoption rose 3.8 percentage points in April to 34.4% of businesses, while OpenAI’s fell 2.9 percentage points to 32.3%. (ramp.com) He said Anthropic had “passed OpenAI in business adoption” for the first time in the index. Ramp said Anthropic had quadrupled business adoption over the last year, while OpenAI’s business adoption grew by 0.3% over the same period. The company also said the market remained fluid and that the latest results should not be read as proof of a permanent leader. (ramp.com) ### What exactly does Ramp’s index measure? Ramp said its AI Index tracks paid adoption using anonymized corporate spend data from its customers’ card and bill-pay transactions. The figures cited in the May 13 note refer to the share of participating businesses paying each vendor, not model quality rankings or total revenue. (ramp.com) Ara Kharazian said he had been asked “which company I think will win the AI race,” but wrote that the software market was changing fast enough that new entrants could disrupt leaders within months. (ramp.com) He also listed risks for Anthropic, including cost pressure, usage complaints and growing interest in cheaper open-source model access through inference platforms. ### What did OpenAI publish on Codex pricing? OpenAI’s Help Center says its Codex rate card now uses token-based pricing rather than per-message pricing. (ramp.com) The company said the change took effect on April 2, 2026 for new and existing Plus, Pro and ChatGPT Business customers and for new ChatGPT Enterprise plans, then on April 23, 2026 for existing Enterprise plans including Edu, Health, Gov and ChatGPT for Teachers. The Help Center lists credit charges per 1 million tokens by model and token type. (ramp.com) For GPT-5.5, OpenAI lists 125 credits for input tokens, 12.50 credits for cached input tokens and 750 credits for output tokens. For GPT-5.3-Codex, the listed rates are 43.75 credits for input tokens, 4.375 for cached input tokens and 350 for output tokens. OpenAI says fast mode consumes credits at a higher rate for supported models. ### How is OpenAI presenting Codex to paying customers? OpenAI’s Codex pricing page says Codex is included in ChatGPT Free, Go, Plus, Pro, Business and Enterprise plans, with plan-specific limits and features. (help.openai.com) The page says Business and Enterprise customers can choose pay-as-you-go or fixed monthly seat-based pricing, while API-key users pay for the tokens Codex uses based on API pricing. The Help Center says Codex costs about $100 to $200 per developer per month on average, with wide variation depending on model choice, number of running instances, automations and fast-mode usage. (help.openai.com) OpenAI also says users can monitor remaining credit, purchase credit and manage auto-reload settings in Codex usage controls. ### What comes next for buyers comparing the two companies? OpenAI’s published rate card remains available in its Help Center and says a small subset of Enterprise customers should continue using a legacy rate card and contact sales for more information. (chatgpt.com) Ramp said its next AI Index updates will continue to track vendor adoption through customer spend data. (help.openai.com)