Testing GPT-5.5 in early access: what we are seeing so far (lovable.dev)

Lovable has begun testing GPT-5.5 in early access, revealing it to be the most capable model for assisting developers, significantly outperforming its predecessor, GPT-5.4, in handling complex tasks that typically cause bottlenecks during app building. In a controlled benchmarking environment, GPT-5.5 demonstrated a 12.5% improvement in successfully resolving the hardest tasks, alongside a reduction in tool calls and output tokens by 23.1% and 33% respectively. This means it delivers more efficient, intentional solutions with fewer iterations. The advancements in GPT-5.5, including improved reasoning on high-stakes requests and enhanced problem-solving capabilities, make it particularly effective for developers facing obstacles like UI issues or backend configuration challenges. As it better resolves user struggles with complex scenarios, this model is poised to facilitate more continuous progress in software development, allowing builders to overcome hurdles with greater ease and at a lower cost per session. Lovable plans to roll out GPT-5.5 to its users soon, marking a significant step forward for the AI/ML community in practical applications within software engineering.