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GPT-5.4 Pro vs Gemini 3.5 Flash — Premium vs Mid-Tier

Gemini 3.5 Flash is 95% cheaper on input ($1.50 vs $30) with 2.5x larger context. Compare OpenAI's most expensive model with Google's fastest mid-tier.

Pricing data verified: Jul 3, 2026

Cheaper by Far

Gemini 3.5 Flash

95% cheaper input ($1.50 vs $30)

Output Cost

Gemini 3.5 Flash

95% cheaper ($9 vs $180)

Context Window

Gemini 3.5 Flash

1M vs 400K (2.5x larger)

Head-to-Head Comparison

Two very different models at very different price points.

Model	Provider	Tier	Input (per 1M)	Output (per 1M)	Context
Gemini 3.5 Flash	Google	Mid	$1.50	$9.00	1M
GPT-5.4 Pro	OpenAI	Premium	$30.00	$180.00	400K

Calculate Your Exact Costs

See the massive cost difference between these two models for your workload.

OpenAI Model

Google Model

Input Tokens per Request

Output Tokens per Request

Requests per Day

Days per Month

OpenAI

GPT-5.4 Pro

$0.00

per month

Input cost$0.00

Output cost$0.00

Per request$0.00

Google

Gemini 3.5 Flash

$0.00

per month

Input cost$0.00

Output cost$0.00

Per request$0.00

Which Should You Choose?

Most Production Workloads

API integrations, chatbots, content generation, general AI tasks.

Pick Gemini 3.5 Flash: At $1.50/$9 it handles most tasks at 95% lower cost than GPT-5.4 Pro. Same 1M context as premium models.

Maximum Capability Tasks

Complex research, advanced math, multi-step reasoning.

Pick GPT-5.4 Pro: Only for tasks requiring absolute maximum capability. The 20x price premium is only justified for high-stakes workloads.

Large Document Processing

Processing long documents, codebases, or datasets.

Pick Gemini 3.5 Flash: 1M context window (2.5x larger than GPT-5.4 Pro's 400K) at 95% lower cost. Better for large-context tasks.

High-Volume APIs

Processing millions of tokens per day in production.

Pick Gemini 3.5 Flash: At 95% lower cost, Gemini 3.5 Flash is the only sensible choice for high-volume production. GPT-5.4 Pro would cost $2,100/month vs $31.50.

Startup Budgets

Early-stage teams watching every dollar.

Pick Gemini 3.5 Flash: 95% savings means you can run 20x more queries for the same budget. Start with Gemini 3.5 Flash and upgrade only when needed.

Enterprise Scale

Production workloads with cost sensitivity.

Pick Gemini 3.5 Flash: At $1.50 input, Gemini 3.5 Flash is the clear enterprise choice. GPT-5.4 Pro's $30 input makes it prohibitive for production-scale deployments.

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Frequently Asked Questions

Is GPT-5.4 Pro or Gemini 3.5 Flash cheaper?

Gemini 3.5 Flash is dramatically cheaper. It costs $1.50/$9.00 per 1M tokens while GPT-5.4 Pro costs $30.00/$180.00. That's 95% cheaper on input and 95% cheaper on output. At 1M tokens/month, Gemini 3.5 Flash costs $31.50 vs GPT-5.4 Pro's $2,100.

What is GPT-5.4 Pro used for?

GPT-5.4 Pro at $30/$180 is OpenAI's most capable model, designed for the most complex reasoning tasks — advanced mathematics, multi-step research, complex code generation. It's 20x more expensive than Gemini 3.5 Flash on input.

When should I use GPT-5.4 Pro vs Gemini 3.5 Flash?

GPT-5.4 Pro ($30/$180) is for tasks requiring absolute maximum capability where cost is secondary. Gemini 3.5 Flash ($1.50/$9) handles most tasks at 95% lower cost with a larger 1M context window. Most users should start with Gemini 3.5 Flash.

Does Gemini 3.5 Flash have a larger context window?

Yes. Gemini 3.5 Flash has a 1M token context window, while GPT-5.4 Pro has 400K. That's 2.5x larger. For tasks requiring processing large documents, codebases, or datasets, Gemini 3.5 Flash offers both lower cost and larger context.

Can I use both models together?

Yes! A cost-effective pattern: use Gemini 3.5 Flash ($1.50/$9) for 95% of tasks and route only the most complex, high-stakes tasks to GPT-5.4 Pro ($30/$180). This gives you maximum capability where needed while keeping costs 90%+ lower.