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Every AI model in one place

Chat across the frontier models from OpenAI, Anthropic, Google, xAI and more, and switch between them mid-conversation without losing context.

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Anthropic

11 models

Claude Haiku 5.5

Fast & affordable

Claude Haiku 5.5 is Anthropic's fastest and cheapest Claude, with adjustable effort, a 1M-token context and solid coding for high-volume work.

1M contextVisionReasoningTool use

Claude Sonnet 5.5

Everyday work

Claude Sonnet 5.5 is Anthropic's newest Sonnet model. It is faster than Sonnet 5 and strong at coding, bug fixes and everyday documents.

1M contextVisionReasoningTool use

Claude Opus 5.5

Flagship reasoning

Claude Opus 5.5 is Anthropic's new flagship for agentic coding and knowledge work, with a 1M-token context and lower prices than Opus 5.

1M contextVisionReasoning

Claude Opus 5

Frontier agents

Claude Opus 5 is Anthropic's strongest Opus model: hybrid reasoning for long-running agents, serious coding and computer use.

1M contextVisionTool use

Claude Sonnet 5

Balanced

Claude Sonnet 5 is Anthropic's balanced everyday model, quick and capable with strong reasoning for the bulk of day-to-day work.

1M contextVisionReasoning

Claude Opus 4.8

Frontier coding

Claude Opus 4.8 is Anthropic's strongest model for coding, agentic tasks and enterprise work, with a 1M-token context window.

1M contextReasoningVision

Claude Opus 4.7

Long-context

Claude Opus 4.7 offers best-in-class long-form writing and document analysis with a careful, grounded voice and a 1M-token context window.

1M contextWriting

Claude Sonnet 4.6

Balanced

Claude Sonnet 4.6 is the everyday workhorse, quick, capable and cost-effective for the bulk of day-to-day tasks.

1M context

Claude Opus 4.6

Deep reasoning

Claude Opus 4.6 brings careful, grounded reasoning for nuanced, high-stakes work that rewards precision over speed.

1M context

Claude Opus 4.5

Reasoning

Claude Opus 4.5 delivers reliable reasoning with a measured, helpful voice across a wide range of knowledge work.

200K context

Claude Haiku 4.5

Fast

Claude Haiku 4.5 is the fastest Claude, tuned for snappy, lightweight tasks where responsiveness is everything.

Economy
FAQ

About the models

Yes. The full thread context carries over, so you can draft with Claude, verify with GPT-5.5, then continue, all in the same chat.
Yes: one Chatday subscription gives you access to every model here. Some premium models require the Pro plan.
GPT-5.5 for hard reasoning and code, Claude for long-form writing, Gemini for multimodal and the largest context, Grok for realtime. When in doubt, start with GPT-5.5.

Every model, one workspace.

Open Chatday and switch between GPT, Claude, Gemini and Grok in a single chat.