HomeModel ComparisonsGPT-5.5 Pro vs Gemini 3 Flash

GPT-5.5 ProvsGemini 3 Flash

Which model is more cost-effective? Compare pricing, context window limits, and run live calculations below.

0 Tokens
Expected Output TokensEstimate generation cost

GPT-5.5 Pro

OpenAI • 512,000 Context
Input (per 1M)
$30
Output (per 1M)
$180
Est. Total Cost$0.0000

Gemini 3 Flash

Google • 1,000,000 Context
Input (per 1M)
$0.5
Output (per 1M)
$3
Est. Total Cost$0.0000

In-Depth Comparison: GPT-5.5 Pro vs Gemini 3 Flash

When choosing between GPT-5.5 Pro (by OpenAI) and Gemini 3 Flash (by Google), developers must weigh API pricing and context window limits.

GPT-5.5 Pro offers a context window of 512,000 tokens at an input cost of $30 per 1M tokens. On the other hand, Gemini 3 Flash provides a 1,000,000 token context window, priced at $0.5 per 1M input tokens. This helps developers find the best balance between performance and budget.

Frequently Asked Questions

Which is cheaper: GPT-5.5 Pro or Gemini 3 Flash?
GPT-5.5 Pro charges $30 per 1M input tokens, whereas Gemini 3 Flash charges $0.5. For output, GPT-5.5 Pro is $180 vs $3 for Gemini 3 Flash.
What is the context window difference between GPT-5.5 Pro and Gemini 3 Flash?
GPT-5.5 Pro offers a context window of 512,000 tokens. In comparison, Gemini 3 Flash supports up to 1,000,000 tokens.
Who provides GPT-5.5 Pro and Gemini 3 Flash?
GPT-5.5 Pro is provided by OpenAI, and Gemini 3 Flash is developed by Google.