Testing GPT-5.5 in early access: what we are seeing so far

Lovable's testing of GPT-5.5 in early access has shown it to be the most capable model for assisting builders with complex tasks, surpassing GPT-5.4 in areas such as production readiness, agentic task completion, and common build scenarios. The evaluation process involved benchmarking on app-building performance, with GPT-5.5 demonstrating 12.5% better performance on the hardest tasks compared to its predecessor, and being more cost-efficient by making 23.1% fewer tool calls and producing 33% fewer output tokens per message. This model excels in resolving complex issues that typically block users, providing novel solutions with strong reasoning, and facilitating continuous progress on tasks such as authentication flows and real-time syncing. The enhanced capabilities of GPT-5.5 make it particularly effective in overcoming obstacles in fewer iterations and at a reduced cost, offering substantial improvements for builders tackling challenging projects.

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