Some developers are using the Claude Code harness to access cheaper non-Anthropic models, including GPT-5.6 Sol, via proxies and services like OpenRouter (Alix Coutures/The Information)

Developers are using the Claude Code harness to access cheaper non-Anthropic models, such as GPT-5.6 Sol, through proxies and services like OpenRouter. This approach allows them to run these models at lower cost while maintaining compatibility with existing Claude workflows. The article also notes that OpenAI is collaborating with Anthropic and Google on safety, and that Elon Musk has urged major AI labs to allow external test harnesses on their models.