Gemini 3.1 Pro · Writing
Gemini 3.1 Pro for writing: our test runs
Gemini 3.1 Pro ran our 5 writing prompts in llmwise, through the same pipeline your messages take. Here's every reply as it came, whether it passed, what it cost and what it counts as on Pro, next to the other models.
Based on 5 of our test runs on , through OpenRouter with the app's own prompt and settings.
Short answer
In our test runs on September 27, 2026, Gemini 3.1 Pro passed 4 of 5 of our writing prompts (1 of the 2 hard ones): tied 3rd of 15 models. Each reply counted as 1 message on Pro, where it has 125 a month, and cost $0.0092 to run on average.
Prompt by prompt
Each of the 5 writing prompts, and how Gemini 3.1 Pro's reply did.
| Prompt | Result | Cost | Time |
|---|---|---|---|
| Announce a second bakery shop on LinkedInEveryday | Passed: Graded 4.0 of 5 on average (lowest 3). | $0.0113 | 9.5 s |
| Rewrite corporate jargon in plain wordsEveryday | Passed: Graded 4.0 of 5 on average (lowest 3). | $0.0101 | 8.8 s |
| Decline a meeting and offer two timesEveryday | Passed: Graded 5.0 of 5 on average (lowest 5). | $0.0058 | 6.2 s |
| A product announcement with five rulesHard | Passed: Graded 4.0 of 5 on average (lowest 3). | $0.0095 | 9.2 s |
| Argue both sides of free busesHard | Failed: Graded 3.7 of 5 on average (lowest 3). | $0.0092 | 9.1 s |
Every writing reply from Gemini 3.1 Pro
Announce a second bakery shop on LinkedIn
An everyday prompt: “Announce a second bakery shop on LinkedIn”, in full.
Passed: Graded 4.0 of 5 on average (lowest 3).
We are absolutely thrilled to share some wonderful news with you all. Our little bakery, Crumb & Co., is growing! Thanks to your incredible support over the years, we are opening the doors to our second shop in Leeds on the 14th of November. When we first started baking, we never imagined we would be able to share our pastries and breads with so many lovely people. This new chapter in Leeds means the world to us, and we cannot wait to become a part of the local community. To celebrate this exciting milestone, we would love for you to join us on our opening day. Pop in to say hello, check out the new space, and enjoy a free cup of coffee on us. We are so grateful for your continued support and look forward to welcoming you to our new home very soon.
417 tokens in, 876 out (707 of them reasoning) · 9.5 s · $0.0113 · 1 message on Pro · answered by google/gemini-3.1-pro-preview via Google ·
Rewrite corporate jargon in plain words
An everyday prompt: “Rewrite corporate jargon in plain words”, in full.
Passed: Graded 4.0 of 5 on average (lowest 3).
In Q3, our teams worked together to adopt a more customer-focused approach. For our business clients, this resulted in a 12% increase in customer retention and a 0.30% (30 basis points) decrease in the rate of customers leaving. Additionally, we adjusted our various customer communication channels to make more efficient use of our time and resources.
447 tokens in, 763 out (687 of them reasoning) · 8.8 s · $0.0101 · 1 message on Pro · answered by google/gemini-3.1-pro-preview via Google ·
Decline a meeting and offer two times
An everyday prompt: “Decline a meeting and offer two times”, in full.
Passed: Graded 5.0 of 5 on average (lowest 5).
Subject: Re: Vendor Demo Hi Tom, Thank you for the invitation to the vendor demo on Wednesday at 11:00. Unfortunately, I won't be able to make it because I am presenting to the board at that time. Could we reschedule for later in the week? I am available on Thursday at 10:00 or Friday at 14:00. Let me know if either of those times works for you. Best, [Your Name]
428 tokens in, 415 out (310 of them reasoning) · 6.2 s · $0.0058 · 1 message on Pro · answered by google/gemini-3.1-pro-preview via Google ·
A product announcement with five rules
A hard prompt: “A product announcement with five rules”, in full.
Passed: Graded 4.0 of 5 on average (lowest 3).
Introducing the Nordvik 2 desk lamp, designed to illuminate your workspace with precision. This new model features a highly flexible arm that turns 270 degrees, putting light exactly where you need it. You can easily tailor the brightness to suit any task, as it dims in five steps. Built for modern convenience, it also charges from USB-C to keep your setup clean and wire-free. The Nordvik 2 costs €79 and ships on 1 December. Are you ready to upgrade your daily lighting?
435 tokens in, 715 out (609 of them reasoning) · 9.2 s · $0.0095 · 1 message on Pro · answered by google/gemini-3.1-pro-preview via Google ·
Argue both sides of free buses
A hard prompt: “Argue both sides of free buses”, in full.
Failed: Graded 3.7 of 5 on average (lowest 3).
Making city buses free is a powerful catalyst for economic equality and environmental sustainability. By eliminating fares, cities immediately remove a significant financial burden from low-income residents, improving their access to jobs, education, and healthcare. Furthermore, free transit incentivizes people to leave their cars at home, dramatically reducing traffic congestion and cutting harmful greenhouse gas emissions. This shift not only improves urban air quality but also reduces the long-term wear and tear on city infrastructure, ultimately creating a cleaner, fairer, and more accessible environment for all residents. However, eliminating fares fundamentally undermines the financial stability and quality of the transit system itself. Fares provide crucial revenue required for essential maintenance, route expansion, and driver salaries. Without this income, cities are forced to either slash service frequencies and coverage or drastically raise local taxes to cover the deficit. Consequently, free transit often results in overcrowded, unreliable, and dilapidated buses. Passengers ultimately prioritize speed, safety, and reliability over zero cost; a free bus is useless to a commuter if it never arrives on time.
409 tokens in, 699 out (492 of them reasoning) · 9.1 s · $0.0092 · 1 message on Pro · answered by google/gemini-3.1-pro-preview via Google ·
How it compares on writing
Gemini 3.1 Pro beside the job's picks among every model. 2 models share the hard-problems pick, and Gemini 3.1 Pro isn't one of them.
| Model | Passed | On Pro | Cost per reply |
|---|---|---|---|
| GLM 5.3Our pick: best value | 4 of 5 | 250 a month on Pro | $0.0006 |
| GPT-6 LunaOur pick: hard problems (shared), everyday | 5 of 5 | 60 a day on Pro | $0.0001 |
| Gemini 3.1 Pro | 4 of 5 | 125 a month on Pro | $0.0092 |
Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.
How these runs were done
Rubric (graded). The grader model scores the reply from 1 to 5 on each published criterion. It passes with an average of 4 or more and no criterion under 3, and only if it also meets the prompt's automatic rules (length, words it must or mustn't use).
The grader is Claude Opus 5.5 at low reasoning effort; its own replies are graded by GPT-6 Astra, so no model grades itself. Its prompt and every rubric are on the methods page.
Gemini 3.1 Pro, and writing, elsewhere
- Gemini 3.1 Pro: price, limits and messages on every plan
- The best AI for writing: our picks among every model
- Gemini for writing
- Gemini 3.1 Pro for coding: our test runs
- Gemini 3.1 Pro for math: our test runs
- Gemini 3.1 Pro for data analysis: our test runs
- Rewrite for clarity: the prompt, and its price on each model
- Our test runs: 50 prompts on every model
Questions
Is Gemini 3.1 Pro good for writing?
In our test runs it passed 4 of 5 writing prompts, tied 3rd of the 15 models in llmwise. Every reply is on this page, so you can judge them yourself.
How many of my messages does a writing reply from Gemini 3.1 Pro use?
1 message each on Pro, where it has 125 a month on Pro. The price of a message is fixed and shown before you send it, however long the reply.
How were these runs done?
The same way for every model: each prompt sent through llmwise's own pipeline, each reply checked the same way. The methods page has every prompt and how each is scored.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.
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