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-6 Astra | 50 | $$$+ |
OpenAI | GPT-6.1 Sol | 10 | $$ |
OpenAI | GPT-6 Sol | 10 | $$ |
OpenAI | GPT-6 Luna | 1 | $ |
Anthropic | Claude Fable 5.1 | 50 | $$$+ |
Anthropic | Claude Opus 5.5 | 20 | $$$+ |
Anthropic | Claude Sonnet 5.5 | 10 | $$ |
Anthropic | Claude Haiku 5.5 | 1 | $ |
xAI | Grok 4.6 | 8 | $$ |
xAI | Grok 4.7 | 8 | $$ |
Example: 100 GPT-6.1 Sol 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-5.6 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 |
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-6 Astra: OpenAI's most capable model for demanding work; monitor credit use closely.
- GPT-6.1 Sol: balances intelligence and cost for support and sales. GPT-6 Sol remains available at the same multiplier.
- GPT-6 Luna: fast, economical choice for high-volume conversations.
- Claude Fable 5.1: Anthropic's most capable option for demanding reasoning; monitor credit use closely.
- Claude Opus 5.5: premium Anthropic reasoning at a lower multiplier than Fable.
- Claude Sonnet 5.5: balances speed and intelligence for general conversations.
- Claude Haiku 5.5: fast, economical Anthropic model for high-volume conversations.
- Grok 4.7: xAI's latest reasoning model. Grok 4.6 remains available at the same multiplier.
Set reasoning effort
When supported, a second control appears beside the model picker. Instant turns reasoning off for the fastest response on models that support it. Higher levels give the model more room to reason and usually increase latency.
- GPT-6 Astra and GPT-6.1 Sol: Low, Medium, High, X-High, Max.
- GPT-6 Sol and Luna: Instant, Low, Medium, High, X-High, Max.
- Claude Fable 5.1, Opus 5.5, Sonnet 5.5, and Haiku 5.5: Low, Medium, High, X-High, Max.
- Grok 4.6 and 4.7: Low, Medium, High, X-High.
- 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.