OpenAI and Anthropic slash prices in aggressive push against open source AI models

The AI pricing war just entered a new phase. OpenAI and Anthropic have been systematically slashing prices on their mid-tier models throughout 2026, with reductions steep enough to make developers reconsider whether open source alternatives are still worth the hassle of self-hosting.

The numbers behind the price war

On July 30, OpenAI cut prices on GPT-5.6 Luna by 80%, bringing costs down to $0.20 per million input tokens and $1.20 per million output tokens. The company’s higher-end GPT-5.6 Terra also got a haircut, dropping 20% to $2 input and $12 output per million tokens.

Anthropic followed on August 10, making the introductory pricing for Claude Sonnet 5 permanent at $2/$10 per million tokens.

Then September 22 brought a second wave. OpenAI launched GPT-6 Sol and Luna at $2/$10 and $0.10/$0.50 respectively, roughly 50% lower than previous generation pricing. Anthropic countered with Claude Opus 5.5 at $4/$20 list pricing, though built-in efficiency improvements deliver around 40% effective savings for users.

Why open source is feeling the squeeze

Enterprises are increasingly splitting their workloads into tiers. Cheap proprietary models handle routine tasks like summarization, classification, and basic customer interactions. Premium models get reserved for specialized workloads where performance differences actually matter.

Open source still commands significant volume share, particularly on platforms like OpenRouter where developers mix and match models.

The China factor complicating everything

Chinese AI companies have been setting aggressively low price benchmarks that make even the reduced US pricing look expensive. DeepSeek V4 Flash offers pricing as low as roughly $0.14/$0.28 per million tokens, undercutting American counterparts by a wide margin.

The performance gap is narrowing too. Some Chinese models now approach US mid-tier capabilities at five to nine times lower costs.

IPO math and margin pressure

Both OpenAI and Anthropic are widely expected to pursue IPOs. Cutting prices aggressively boosts adoption and usage metrics, but it also compresses margins. The bet is that lower prices drive higher volume, and higher volume eventually compensates for thinner margins on each individual API call.

Disclosure: This article was edited by Diego Almada Lopez. For more information on how we create and review content, see our Editorial Policy.