Google Gemini vs OpenAI GPT: Complete Comparison 2026
Compare Google Gemini 2.5 Pro/Flash with OpenAI GPT-5/4.1 models. Pricing, context windows, and performance across different use cases.
Last updated: February 2026
Pricing Comparison
| Model | Provider | Input $/1M | Output $/1M | Context | Max Output |
|---|---|---|---|---|---|
| Gemini 2.5 Pro | $1.25 | $10 | 1M | 65K | |
| GPT-5 | OpenAI | $1.25 | $10 | 400K | 128K |
| Gemini 2.5 Flash | $0.15 | $0.6 | 1M | 65K | |
| GPT-4.1 | OpenAI | $2 | $8 | 1M | 32K |
Detailed Comparison
Gemini 2.5 Pro
$1.25 / $10
per 1M tokens
Strengths
- + Largest context window (1M tokens)
- + Same input price as GPT-5
- + Largest max output (65K)
Best For
Long document analysis, cost-effective premium tasks
Context Window
1M
Max Output
65K
GPT-5
OpenAI
$1.25 / $10
per 1M tokens
Strengths
- + Broader ecosystem support
- + More mature API and tooling
- + Strong multi-modal capabilities
Best For
Enterprise applications, broad integration needs
Context Window
400K
Max Output
128K
Gemini 2.5 Flash
$0.15 / $0.6
per 1M tokens
Strengths
- + Extremely cost-effective
- + 1M context at flash speed
- + Great for high-volume processing
Best For
High-volume tasks, budget-conscious applications
Context Window
1M
Max Output
65K
GPT-4.1
OpenAI
$2 / $8
per 1M tokens
Strengths
- + Matches Gemini context window
- + Good balance of price and quality
- + Reliable for production
Best For
Production workloads needing large context
Context Window
1M
Max Output
32K
Verdict
GPT-5 and Gemini 2.5 Pro now share the same input pricing ($1.25/1M), but Gemini offers a 1M context window vs GPT-5's 400K. Gemini 2.5 Flash at $0.15/$0.60 is the best budget option. GPT-4.1 matches Gemini's 1M context at a slightly higher price. Choose Gemini for massive context and cost savings; choose GPT for ecosystem maturity.
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FAQ
Which is cheaper, Gemini 2.5 Pro or GPT-5?
Gemini 2.5 Pro costs $1.25/$10 per million tokens (input/output), while GPT-5 costs $1.25/$10. GPT-5 is cheaper for input.
Which has a larger context window?
Gemini 2.5 Pro supports 1M context, while GPT-5 supports 400K. Larger context windows allow processing more text in a single request.
Which should I choose for my project?
GPT-5 and Gemini 2.5 Pro now share the same input pricing ($1.25/1M), but Gemini offers a 1M context window vs GPT-5's 400K. Gemini 2.5 Flash at $0.15/$0.60 is the best budget option. GPT-4.1 matches Gemini's 1M context at a slightly higher price. Choose Gemini for massive context and cost savings; choose GPT for ecosystem maturity.