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GPT-4 Turbo vs Gemini 1.5 Flash

Pricing, context window, and benchmark comparison · Last updated April 2026

Quick Verdict

Gemini 1.5 Flash is cheaper than GPT-4 Turbo at $0.07/1M/1M vs $10.00/1M/1M input tokens — a 133.3x cost difference. GPT-4 Turbo scores higher on quality benchmarks (ELO 1260). Choose Gemini 1.5 Flash for cost-sensitive workloads; choose GPT-4 Turbo for maximum quality.

Detailed Comparison

MetricGPT-4 TurboGemini 1.5 Flash
Input Price / 1M tokens$10.00/1M$0.07/1MCheaper
Output Price / 1M tokens$30.00/1M$0.30/1MCheaper
Context Window128K1MLarger
ELO Score (LMSYS)1260Smarter1211
Open Source
Free Tier
Release Date2023-112024-05

Which is cheaper: GPT-4 Turbo or Gemini 1.5 Flash?

Gemini 1.5 Flash is the cheaper option at $0.07/1M per 1M input tokens, compared to $10.00/1M for GPT-4 Turbo. That is a 133.3x cost difference on input tokens. Output pricing follows a similar pattern: GPT-4 Turbo charges $30.00/1M/1M vs $0.30/1M/1M for Gemini 1.5 Flash.

Which has better quality: GPT-4 Turbo or Gemini 1.5 Flash?

Based on LMSYS Chatbot Arena rankings, GPT-4 Turbo achieves a higher ELO score (1260 vs 1211), suggesting stronger performance on open-ended tasks. GPT-4 Turbo excels at strong general reasoning. Gemini 1.5 Flash is known for one of the cheapest high-quality models available.

Which should you choose: GPT-4 Turbo or Gemini 1.5 Flash?

Choose GPT-4 Turbo if:
  • Strong general reasoning
  • Good at following complex multi-step instructions
  • Reliable tool/function calling
Choose Gemini 1.5 Flash if:
  • One of the cheapest high-quality models available
  • 1M token context window
  • Very fast inference

Frequently Asked Questions

Which is cheaper: GPT-4 Turbo or Gemini 1.5 Flash?

Gemini 1.5 Flash is cheaper at $0.07/1M per 1M input tokens, making it 133.3x more affordable.

Which has better quality: GPT-4 Turbo or Gemini 1.5 Flash?

GPT-4 Turbo scores higher on the LMSYS Chatbot Arena with an ELO of 1260, suggesting better overall quality for most tasks.

Which has a larger context window: GPT-4 Turbo or Gemini 1.5 Flash?

Gemini 1.5 Flash has a larger context window at 1000K tokens.

Should I choose GPT-4 Turbo or Gemini 1.5 Flash?

Choose Gemini 1.5 Flash if cost is the priority. Choose GPT-4 Turbo if benchmark quality is most important. Consider your specific use case: GPT-4 Turbo is best for coding and function-calling, while Gemini 1.5 Flash excels at low-cost and fast-response.

Is GPT-4 Turbo or Gemini 1.5 Flash open source?

GPT-4 Turbo is proprietary. Gemini 1.5 Flash is proprietary.

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