Cloud Computing Giants Google and Amazon Enter AI Coding Editor Wars with Antigravity and Kiro

Google's Antigravity and Amazon's Kiro are two of the latest entrants in the cloud computing space, offering AI-native code editors that compete with Windsurf. While Google's Antigravity is free to use for individuals, its usage is rate-limited against the underlying Gemini 3 Pro API, costing $2 per million input tokens and $12 per million output tokens for prompts under 200,000 tokens.

Kiro, on the other hand, is a 'spec-driven' agentic IDE that runs on AWS Bedrock. Its pricing is strictest among the three tools, with a free tier pairing open-weight models with Claude Sonnet 4.5 and paying tiers unlocking more advanced features. The tool's focus on process-heavy development makes it suitable for teams who have been burned by agents that 'helpfully' reinterpret vague prompts.

The rivalry between these cloud vendors has changed the incentive structure in the market, allowing them to offer free or low-cost AI editors as a way to drive consumption of their existing cloud ecosystems. This shift is significant, as it marks a departure from how hyperscalers like Google and Amazon have historically shipped developer tools.