Citibank, Atlassian, and Adobe are restricting employee use of advanced AI models like GPT-5.5 and Claude Opus 4.6 due to unsustainable cost increases from usage-based pricing. Atlassian's monthly AI spending tripled from $5 million in August 2025 to over $15 million in May 2026. This reveals concrete financial challenges in enterprise AI adoption, contradicting the narrative of unlimited AI integration. Companies may need to adopt cost management strategies, potentially slowing AI deployment in business workflows. Citibank banned GPT-5.5 and Claude Opus 4.6 on June 24, 2026, due to excessive AI credit consumption. Atlassian implemented cost-tracking dashboards and ended unlimited usage, while Adobe did not renew its unlimited Claude contract expiring June 30, 2026.
Background
GPT-5.5 is a large language model by OpenAI released April 23, 2026, known for high benchmark scores and a tendency to mention goblins that was later corrected. Claude Opus 4.6 is Anthropic's flagship model released February 5, 2026. These models are offered via API with usage-based pricing, meaning companies pay per token processed, which can lead to unpredictable costs when scaled across employees.