OpenAI cuts GPT-5.6 Sol developer pricing by more than 20% for three months

OpenAI has reduced prices for its frontier GPT-5.6 Sol model by over 20 per cent for developers via its API, cutting input token costs to US$4 per million and output tokens to US$20. The three-month promotional period comes amid rising competition from Anthropic and Chinese AI models.

OpenAI said on Friday it is cutting the prices of its frontier GPT-5.6 Sol model for developers by more than 20 per cent for the next three months, as the ChatGPT maker faces growing competition from Anthropic and Chinese AI models.

The price cuts are effective on OpenAI's application programming interface (API) and are rolling out across eligible plans for credits on its agentic AI product ChatGPT Work and its coding tool Codex, OpenAI said. Pricing for Pro, Plus and Business subscriptions remains unchanged.

GPT-5.6 Sol is now priced at US$4 per 1 million input tokens and US$20 per 1 million output tokens for standard short-context use, according to OpenAI's pricing table. That compares with previous prices of US$5 and US$30, respectively.

OpenAI late last month slashed prices of its smaller models. It cut prices for the mid-tier GPT-5.6 Terra model by 20 per cent and for the lower-cost Luna model by 80 per cent.

For comparison, Anthropic lists its frontier Claude Fable 5 model at US$10 per 1 million input tokens and US$50 per 1 million output tokens, while its Claude Opus 5 model is listed at US$5 per 1 million input tokens and US$25 per 1 million output tokens.