GPT-4o vs Gemini 1.5 Flash
Pricing, context window, and benchmark comparison · Last updated April 2026
Gemini 1.5 Flash is cheaper than GPT-4o at $0.07/1M/1M vs $2.50/1M/1M input tokens — a 33.3x cost difference. GPT-4o scores higher on quality benchmarks (ELO 1286). Choose Gemini 1.5 Flash for cost-sensitive workloads; choose GPT-4o for maximum quality.
Which is cheaper: GPT-4o or Gemini 1.5 Flash?
Gemini 1.5 Flash is the cheaper option at $0.07/1M per 1M input tokens, compared to $2.50/1M for GPT-4o. That is a 33.3x cost difference on input tokens. Output pricing follows a similar pattern: GPT-4o charges $10.00/1M/1M vs $0.30/1M/1M for Gemini 1.5 Flash.
Which has better quality: GPT-4o or Gemini 1.5 Flash?
Based on LMSYS Chatbot Arena rankings, GPT-4o achieves a higher ELO score (1286 vs 1211), suggesting stronger performance on open-ended tasks. GPT-4o excels at multimodal: handles text, images, and audio natively. Gemini 1.5 Flash is known for one of the cheapest high-quality models available.
Which should you choose: GPT-4o or Gemini 1.5 Flash?
- → Multimodal: handles text, images, and audio natively
- → Strong reasoning and instruction following
- → Excellent coding capabilities
- → One of the cheapest high-quality models available
- → 1M token context window
- → Very fast inference
Frequently Asked Questions
Which is cheaper: GPT-4o or Gemini 1.5 Flash?
Gemini 1.5 Flash is cheaper at $0.07/1M per 1M input tokens, making it 33.3x more affordable.
Which has better quality: GPT-4o or Gemini 1.5 Flash?
GPT-4o scores higher on the LMSYS Chatbot Arena with an ELO of 1286, suggesting better overall quality for most tasks.
Which has a larger context window: GPT-4o or Gemini 1.5 Flash?
Gemini 1.5 Flash has a larger context window at 1000K tokens.
Should I choose GPT-4o or Gemini 1.5 Flash?
Choose Gemini 1.5 Flash if cost is the priority. Choose GPT-4o if benchmark quality is most important. Consider your specific use case: GPT-4o is best for coding and image-understanding, while Gemini 1.5 Flash excels at low-cost and fast-response.
Is GPT-4o or Gemini 1.5 Flash open source?
GPT-4o is proprietary. Gemini 1.5 Flash is proprietary.