Chatwith supports multiple AI models so you can balance answer quality, speed, capabilities, and message-credit cost. You can change the model without retraining knowledge sources.
Choose a model
- Open Settings → General.
- Open the model picker. Use Recommended, select a provider, or search by name.
- Review the Vision, Reasoning, and Files icons and the relative cost indicator.
- Select a model and save. Star frequently used models to keep them in Favorites.
Premium models are visible but locked when the current plan does not include model switching.
New model message-credit pricing
The multiplier below is the number of message credits charged for one AI reply.
Provider | Model | Credits per AI reply | Relative cost |
OpenAI | GPT-5.6 Sol | 15 | $$$ |
OpenAI | GPT-5.6 Terra | 10 | |
OpenAI | GPT-5.6 Luna | 2 | $ |
Anthropic | Claude Opus 5 | 15 | $$$+ |
Anthropic | Claude Sonnet 5 | 10 | $$$ |
xAI | Grok 4.5 | 5 |
Example: 100 GPT-5.6 Terra replies use 1,000 message credits. Reasoning effort does not change the multiplier, although deeper reasoning can take longer.
Other supported models
Provider | Model | Credits per AI reply |
OpenAI | GPT-5.5 | 15 |
OpenAI | GPT-5.4 | 10 |
OpenAI | GPT-5.4 mini | 2 |
OpenAI | GPT-5.3 | 5 |
OpenAI | GPT-5.2 | 10 |
OpenAI | GPT-5 | 10 |
OpenAI | GPT-5 mini | 2 |
Anthropic | Claude Opus 4.8, 4.7, or 4.6 | 15 |
Anthropic | Claude Sonnet 4.6 or 4.5 | 10 |
Google | Gemini Flash 2.5 | 3 |
Mistral | Mistral Medium | 2 |
Which new model should I use?
- GPT-5.6 Sol: strongest OpenAI option for complex work where quality matters more than cost.
- GPT-5.6 Terra: balanced OpenAI model for general support and sales.
- GPT-5.6 Luna: fast, economical choice for high-volume conversations.
- Claude Opus 5: premium Anthropic reasoning; monitor credit use closely.
- Claude Sonnet 5: strong Anthropic model with a lower multiplier than Opus.
- Grok 4.5: xAI reasoning at a mid-range multiplier.
Set reasoning effort
When supported, a second control appears beside the model picker. Instant turns reasoning off for the fastest response. Higher levels give the model more room to reason and usually increase latency.
- GPT-5.6 Sol, Terra, and Luna: Instant, Low, Medium, High, X-High, Max.
- Claude Opus 5 and Sonnet 5: Instant, Low, Medium, High, X-High, Max.
- Grok 4.5: Low, Medium, High.
- When switching models, Chatwith keeps the closest supported effort level.
Capabilities
The picker marks whether each model supports:
- Vision: understands uploaded images.
- Reasoning: can spend additional effort on complex requests.
- Files: reads uploaded PDFs.
Use your own OpenAI API key
You can add an OpenAI API key in Settings → General for supported OpenAI models. Your OpenAI account must have access and billing enabled for the model. Keys from other providers are not accepted in this field.