OpenAI's previous frontier model for complex professional workloads, built on GPT-5.4 with stronger reasoning and higher reliability.
Google's high-speed thinking model for agentic workflows, chat, and coding.
No shared agent demos for these models yet.
No captured outputs for these models yet.
Based on the Capability Index, GPT 5.5 scores higher (89.6 vs 86.2). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Gemini 3.5 Flash has a lower blended cost. GPT 5.5: $5.00 input / $30.00 output. Gemini 3.5 Flash: $1.50 input / $9.00 output.
GPT 5.5 has a larger context window: GPT 5.5 supports 1.1M tokens vs Gemini 3.5 Flash at 1M tokens.
Yes, both GPT 5.5 and Gemini 3.5 Flash support vision/image input.
GPT 5.5 scores higher on SWE-bench Verified: GPT 5.5 resolves 81% vs Gemini 3.5 Flash at 79%.
Key differences: Gemini 3.5 Flash is significantly cheaper. Compare full specs on this page.
If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.5 and Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.