OpenAI Unleashes Pricing Blow to Anthropic on OpenRouter

OpenAI has launched a promotional pricing campaign for its GPT-5.6 series models on OpenRouter, aiming to challenge Anthropic's dominance in the market. The discounted lineup includes Luna, Sol, Terra, and their Pro counterparts, with prices starting at $0.10 to $2.50 per million input tokens.

The pricing strategy appears designed to target high-volume, latency-sensitive applications such as chat services and classification tasks. According to community feedback on Reddit and developer forums, teams are beginning to transition workloads away from Anthropic's Sonnet models to GPT-5.6 Luna due to the significant cost savings.

The discounted pricing has already shown results, with GPT-5.6 Luna usage exceeding the combined traffic of Anthropic's Claude Opus 5 and Sonnet 5 on OpenRouter. The promotional pricing is available through a dedicated collection page set up by OpenRouter.