GPT-5.5 vs Gemini 3.5 Flash
OpenAI's premium flagship vs Google's fast mid-tier model. Compare pricing, context windows, and find the best value for your workload.
Pricing data verified: Jun 20, 2026
| Specification | GPT-5.5 (OpenAI) | Gemini 3.5 Flash (Google) |
|---|---|---|
| Input Price (per 1M tokens) | $5.00 | $1.50 |
| Output Price (per 1M tokens) | $30.00 | $9.00 |
| Context Window | 1.05M tokens | 1M tokens |
| Tier | Premium | Mid |
| Provider | OpenAI | |
| Price Difference | 3.3x more expensive | 70% cheaper |
Calculate Your Exact Costs
Premium vs mid-tier — see how much you can save by choosing the right model for your workload.
Compare Similar Models
Which Model for Which Use Case?
SaaS Chatbot
High-volume customer-facing chat. Gemini 3.5 Flash delivers excellent conversational quality at 70% lower cost. GPT-5.5 is overkill for most chatbot workloads.
Content Generation at Scale
Blog posts, marketing copy, product descriptions. Both models handle this well. Gemini 3.5 Flash at $1.50/$9 vs GPT-5.5 at $5/$30 — 70% savings.
Complex Research Analysis
Multi-step reasoning, research synthesis, nuanced analysis. GPT-5.5's premium reasoning capabilities justify the higher cost for high-stakes tasks.
Enterprise AI Assistant
High-stakes enterprise deployments requiring maximum quality. GPT-5.5's larger context (1.05M) and premium reasoning justify the premium price.
Not sure which model is right?
APIpulse Pro compares all 42 models, saves scenarios, and finds the cheapest option for your exact usage pattern.
Frequently Asked Questions
How much cheaper is Gemini 3.5 Flash than GPT-5.5?
Gemini 3.5 Flash is 70% cheaper on input ($1.50 vs $5.00 per 1M tokens) and 70% cheaper on output ($9.00 vs $30.00 per 1M tokens). For a typical workload of 1M input and 500K output tokens per month, Gemini 3.5 Flash costs $6.00 vs GPT-5.5's $20.00 — a savings of $14.00 per month.
Is Gemini 3.5 Flash as good as GPT-5.5?
GPT-5.5 is OpenAI's premium flagship model, designed for maximum reasoning capability. Gemini 3.5 Flash is Google's mid-tier model optimized for speed and cost-efficiency. For most common tasks (chatbots, content generation, data extraction), Gemini 3.5 Flash delivers excellent results at 70% lower cost. GPT-5.5 excels at complex multi-step reasoning and tasks requiring the highest quality output.
When should I choose GPT-5.5 over Gemini 3.5 Flash?
Choose GPT-5.5 when you need: (1) Maximum reasoning quality for complex tasks, (2) The largest context window (1.05M vs 1M tokens), (3) Enterprise-grade reliability from OpenAI's infrastructure. Choose Gemini 3.5 Flash when cost efficiency matters more than marginal quality gains — it's 70% cheaper with excellent performance for most workloads.
Can I mix GPT-5.5 and Gemini 3.5 Flash to optimize costs?
Yes. Route simple, high-volume tasks (chatbots, content generation, data extraction) to Gemini 3.5 Flash at $1.50/$9.00, and reserve GPT-5.5 ($5.00/$30.00) for complex reasoning, analysis, and tasks requiring maximum quality. This tiered strategy can reduce costs by 40-60% while maintaining quality where it matters most.