Gemini 2.5 Flash is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding, mathematics, and scientific tasks. It includes built-in "thinking" capabilities, enabling it to provide responses with grea…
Model details →Google: Gemini 2.5 Flash vs OpenAI: GPT-5.5 Pro
Google: Gemini 2.5 Flash wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
Model details →Side-by-side comparison
| Capability | Google: Gemini 2.5 Flash | OpenAI: GPT-5.5 Pro | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.0M | 1.1M | 🏆 OpenAI: GPT-5.5 Pro |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.30 | $30.00 | 🏆 Google: Gemini 2.5 Flash |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $2.50 | $180.00 | 🏆 Google: Gemini 2.5 Flash |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Google: Gemini 2.5 Flash better than OpenAI: GPT-5.5 Pro?
Google: Gemini 2.5 Flash wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Google: Gemini 2.5 Flash and OpenAI: GPT-5.5 Pro?
Input: $0.30 vs $30.00 per 1M tokens. Output: $2.50 vs $180.00 per 1M tokens.
What context windows do Google: Gemini 2.5 Flash and OpenAI: GPT-5.5 Pro support?
Google: Gemini 2.5 Flash supports up to 1.0M tokens. OpenAI: GPT-5.5 Pro supports up to 1.1M tokens.
Do both Google: Gemini 2.5 Flash and OpenAI: GPT-5.5 Pro support tool calling?
Google: Gemini 2.5 Flash: yes. OpenAI: GPT-5.5 Pro: yes.
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