The best AI for writing emails
Which model to use for writing emails, why, and how to try it without paying for three separate subscriptions.
Model data updated: 2026-10-04
Top pick: ChatGPT
Reliably hits the register you ask for — formal, warm, or blunt — and keeps it short.
The most widely used general-purpose assistant, with the broadest ecosystem of tools and integrations.
- Balanced quality across almost every task
- Strongest tool and plugin ecosystem
- Reliable multimodal (image) understanding
| Representative model | Provider | Context | Input | Output |
|---|---|---|---|---|
| GPT-5.6 Terra | OpenAI | 128K | $0.50 | $1.50 |
per 1M tokens. Prices are the providers’ list prices in USD per million tokens and can change at any time. Use them for comparison, not billing.
Also good
Claude
Favoured for long documents, careful reasoning and natural writing, with very large context windows.
Gemini
Strong price-to-performance with fast responses and generous free access — the model behind Blend’s free trial.
Try this question
Turn these notes into a short, polite email declining the offer.
In Blend you do not have to choose manually — Auto sends this kind of question to the model above.
ChatGPT models you can use in Blend
| Model | Context | Input | Output | Images |
|---|---|---|---|---|
| GPT-5.6 Terra | 128K | $0.50 | $1.50 | Yes |
| GPT-5.2 | 128K | $0.50 | $1.50 | Yes |
| GPT-5.4 mini | 128K | $0.50 | $1.50 | Yes |
| GPT-5.4 nano | 128K | $0.50 | $1.50 | Yes |
Blend currently exposes 4 ChatGPT models with published pricing or context figures.
Tasks where ChatGPT is the first pick
Frequently asked
The best AI for writing emails
ChatGPT (OpenAI). Reliably hits the register you ask for — formal, warm, or blunt — and keeps it short. In Blend you do not have to choose manually — Auto sends this kind of question to the model above.
Try this question
Turn these notes into a short, polite email declining the offer.
Can I ask ChatGPT and Claude the same question at once?
Yes. Blend sends one question to both and puts the answers side by side, and a second model can fact-check the first. There is a free daily tier with no signup.
Blend — one question, multiple AIs, better answers
Related comparisons
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- The best AI for writing
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- ChatGPT vs Claude
- ChatGPT vs Gemini
Model capabilities and prices change often. Figures come from Blend’s automatically synced registry and are shown for comparison. All model prices · Terms · Privacy Policy · Refund