GPT-5 vs Gemini 3 Pro for email drafting: which is better in 2026?
A head-to-head look at GPT-5 and Gemini 3 Pro for email drafting. Benchmarks via artificialanalysis.ai, pricing as of May 2026. Compare AI models like these inside Admix.
Quick verdict
For email drafting in May 2026, Gemini 3 Pro edges out GPT-5 on the inputPricePerMTok metric. Largest practical context window.
Side-by-side specs
| Spec | GPT-5 | Gemini |
|---|---|---|
| Intelligence index | 78.4 | 75.6 |
| Coding index | 76.1 | 73.4 |
| Context window | 400K tokens | 2M tokens |
| Speed (tok/s) | 142 | 165 |
| Input $/M | $5.00 | $2.50 |
| Output $/M | $20.00 | $10.00 |
| Released | Aug 7, 2025 | Feb 12, 2026 |
How they handle email drafting
GPT-5: Top reasoning and math scores. The main caveat is more expensive than mid-tier models.
Gemini 3 Pro: Largest practical context window. The main caveat is coding scores below claude and gpt-5.
Cost per 1,000 queries
Assuming 1,500 input and 800 output tokens per query:
- GPT-5: $23.50 per 1,000 queries
- Gemini 3 Pro: $11.75 per 1,000 queries
Verdict by sub-task
- Best raw quality on email drafting:
- Best price: Gemini 3 Pro
- Longest context: Gemini 3 Pro
- Fastest: Gemini 3 Pro
FAQ
Is GPT-5 better than Gemini 3 Pro for email drafting?
On May 2026 benchmarks (artificialanalysis.ai), Gemini 3 Pro ranks higher than GPT-5 for email drafting on the inputPricePerMTok metric. The gap is small enough that the choice often comes down to price, context length, and tone.
Which is cheaper, GPT-5 or Gemini 3 Pro?
GPT-5 costs $5.00 input and $20.00 output per million tokens. Gemini 3 Pro costs $2.50 input and $10.00 output per million tokens.
Can I use both GPT-5 and Gemini in one app?
Yes. Admix is a multi model AI chat aggregator that lets you run GPT-5 and Gemini 3 Pro side by side under one subscription.
Sources
Benchmarks from artificialanalysis.ai (May 2026).
Related
Try both GPT-5 and Gemini in Admix
One subscription, side-by-side answers, no API plumbing. From $8.99/mo.
Try Admix free