Google's most intelligent Flash model, with significant gains over 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.
OpenAI's previous frontier model for complex professional workloads, built on GPT-5.4 with stronger reasoning and higher reliability.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Gemini 3.8 Flash and GPT 5.5 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.
Gemini 3.8 Flash has a lower blended cost. Gemini 3.8 Flash: $0.75 input / $3.75 output. GPT 5.5: $5.00 input / $30.00 output.
GPT 5.5 has a larger context window: Gemini 3.8 Flash supports 1M tokens vs GPT 5.5 at 1.1M tokens.
Yes, both Gemini 3.8 Flash and GPT 5.5 support vision/image input.
Key differences: Gemini 3.8 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 Gemini 3.8 Flash and GPT 5.5 for free on idapt.app to see which performs better for your specific needs.