LLM Providers

LLM providers are the AI companies whose models power your agents. FormWise does not lock you into a single provider - you can connect any of the supported providers and choose the best model for each task.

What are LLM providers?

Every time your agent generates a response, it uses a large language model (LLM) behind the scenes. These models are built and hosted by companies like OpenAI, Anthropic, and Google. By adding your own API key for a provider, you get direct access to their models inside FormWise.

Supported providers

FormWise currently supports connecting your own API key for three providers, each with the latest models from that company plus recent prior generations:

OpenAI

OpenAI offers the GPT family of models, including GPT-5.5 and GPT-4o, alongside smaller, faster options like GPT-4o Mini for everyday tasks on a budget.

Get your API key at platform.openai.com.

Anthropic Claude

Anthropic's Claude models are known for careful reasoning and long-context handling - currently the Claude Opus family for the most demanding work, Claude Sonnet as a balanced default, and Claude Haiku for fast, everyday tasks.

Get your API key at console.anthropic.com.

Google Gemini

Google's Gemini models offer strong reasoning and multimodal capabilities - including Gemini 3.1 Pro for advanced, multi-step reasoning and Gemini 3 Flash for fast, cost-efficient everyday use.

Get your API key at ai.google.dev.

Model lineups move quickly. The Model dropdown inside each Agent node always reflects the current, live set of models for whichever providers you've connected - treat the names above as examples, not an exhaustive list.

Adding an API key

1. Go to Settings in the left sidebar.
2. Click the Integrations tab, then the API Keys sub-tab.
3. Find the provider you want to connect.
4. Paste your API key into the field provided.
5. Click Save.

That's it - the provider's models are now available across all your Flows.

Choosing a model for your agent

Once you have at least one provider connected, you can select which model your agent uses:

1. Open your Flow in the workflow builder.
2. Click on an Agent node.
3. In the node settings, find the Model dropdown.
4. Choose your preferred provider and model.

How to decide which model to use

• Need top-quality results? Go with a flagship model like GPT-5.5, Claude Opus, or Gemini 3.1 Pro.
• Want fast, affordable responses? Try a lighter model like GPT-4o Mini, Claude Haiku, or Gemini 3 Flash.
• Working with images or files? Use a multimodal model - most current flagship and mid-tier models across all three providers support this.
• Not sure? Start with a balanced mid-range model like Claude Sonnet or GPT-4o and adjust based on your results.

Different agents within the same Flow can use different models, so you can mix and match to balance cost and quality.