---
title: "GPT-6.1, Claude 5.5 and Gemini 4 Argon are here"
description: "Five new models are available for your chats and agents: GPT-6.1 Terra, GPT-6.1 Sol, Claude Sonnet 5.5, Claude Haiku 5.5 and Gemini 4 Argon."
---

> Documentation Index
> Fetch the changelog index at: https://docs.aiagent.app/changelog/llms.txt

# GPT-6.1, Claude 5.5 and Gemini 4 Argon are here

Five new models are available for your chats and agents. Open the model picker and click **See all models** to find them. Your plan sets which models you can use.

![A model picker lists GPT-6.1 Terra, GPT-6.1 Sol, Claude Sonnet 5.5, Claude Haiku 5.5 and Gemini 4 Argon, with GPT-6.1 Terra selected.](/changelog/art-gpt-6-1-claude-5-5-and-gemini-4-in-chat.webp)

- **OpenAI:** GPT-6.1 Terra and GPT-6.1 Sol.
- **Anthropic:** Claude Sonnet 5.5 and Claude Haiku 5.5.
- **Google:** Gemini 4 Argon.

Source: https://docs.aiagent.app/changelog/gpt-6-1-claude-5-5-and-gemini-4-in-chat/index.mdx