Sudowrite just added Google’s Gemini 3.1 Pro and Anthropic’s Claude Sonnet 4.6 to its lineup, and both are available now across Write, Draft, and Plugins.
More model options is genuinely exciting if you’re a fiction writer. Each one handles creative prose differently, and having them all in one place means you can actually find the one that clicks with your voice instead of settling.
What’s New
Gemini 3.1 Pro is Google’s latest flagship, released just five days before Sudowrite added it. Google claims a 2x reasoning improvement over its predecessor, and it supports a million-token context window. For fiction writers, that translates to stronger comprehension of long, layered prompts and better consistency when you’re deep in a drafting session.
Claude Sonnet 4.6 is Anthropic’s newest mid-tier model, and it punches above its weight. In benchmarks, it performs close to Opus-class models (Anthropic’s top tier) while using fewer credits. The Claude family has built a solid reputation among fiction writers for handling voice and tonal shifts well. Sonnet 4.6 carries that forward.
Sudowrite also added Claude Opus 4.6 (Anthropic’s most powerful model) earlier in February. So yeah, if you’re a Sudowrite user, you now have the latest from Google, Anthropic, and OpenAI all under one roof. That’s pretty damn cool.
The Preservation Angle
This part is low-key my favorite.
Sudowrite is keeping older models available even as their creators retire them. OpenAI pulled GPT-4o from ChatGPT on February 13. Sudowrite kept it. If GPT-4o was your go-to for a particular type of scene or voice, you can still use it. Claude 3.7 Sonnet will also remain accessible on Sudowrite through April 28, well beyond its expected deprecation window.
Anyone who’s found that model, the one that just gets your prose, knows how frustrating it is when it vanishes overnight. Sudowrite clearly gets that.
Bug Fixes Worth Mentioning
The same update fixed an issue where importing novels could fail, improved Find & Replace performance, and sped up POV and tense detection when you update your synopsis. Not sexy, but the kind of stuff that makes you less likely to throw your laptop across the room at 2 AM.
What to Do
If you’re already a Sudowrite user, the new models are sitting in your account right now. Go try them on whatever you’re working on. Seriously, just swap models mid-scene and see what happens. Some nail dialogue, others are better at descriptive prose, and you won’t know which one vibes with your project until you experiment.
If you’ve been curious about Sudowrite but haven’t pulled the trigger, this is a solid time to look. Having multiple top-tier models in a single writing-focused interface saves you from the “seventeen browser tabs open” approach to AI-assisted fiction. (We’ve all been there.)
The model race benefits authors most when writing tools actually keep up. Sudowrite adding these models within days of their release, while preserving ones being retired elsewhere, tells me they’re paying attention to what fiction writers actually need. That matters way more than any single model upgrade.