OpenAI's latest ultra-budget model costs 80% less to run than Anthropic's cheapest offering, yet Anthropic's October 2026 IPO filing reveals that enterprise adoption of Claude continues to accelerate, driven by factors beyond raw pricing. OpenAI's GPT-5.4 Nano, launched in March 2026, costs $0.20 per million input tokens versus $1.00 for Anthropic's Claude Haiku 4.5—a dramatic cost advantage for high-volume, commodity workloads like data extraction and formatting. GPT-5.4 Nano also processes tokens nearly twice as fast (165.8 tokens per second versus 94.6) and offers a larger context window (400K tokens versus 200K). The pricing disparity is significant: for a company processing 100 billion tokens monthly, the annual savings with OpenAI's cheapest tier could exceed $80 million compared to Anthropic's equivalent.
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