OpenAI now gives eligible $100, $200 and $500 ChatGPT subscribers the same dollar amount in credits for an API organization. It mirrors a benefit Anthropic announced earlier this month for its Max and Team plans. For developers who pay for both a coding assistant subscription and API usage, it changes the cost math.
Simon Willison highlights Jacob Sansbury's account of building Spawn, a multiplayer game world changed by prompts to an in-game AI. The team says a swarm of Fable-powered agents edits live code and ships to production about hourly. It is a rare, concrete look at how far coding agents can run autonomously in production.
Simon Willison argues that October 2026 is when AI models became good enough at game design to make vibe coded games genuinely fun. He built four browser games mostly with Claude Opus 5.5 and shares the prompts and workflow he used. The post is a practical look at iterating with coding agents, and at where GPT-6 models still fall short.