The four flagship models
In Capriole AI, every model in this table is unlimited in Premium and Team web chat. On the API, a token costs the same on every model: USD 8 per 5M tokens.
GPT-6 Astra
OpenAI calls GPT-6 Astra its most capable model for the most demanding work. OpenAI lists a 1.05M-token context window and up to 128,000 output tokens. In Capriole AI, GPT-6 Astra Thinking is the web chat default, andopenai-latest uses GPT-6 Astra on the API.
Claude Fable 5.1
Anthropic positions Claude Fable 5.1 for demanding reasoning and long-horizon agentic work. Anthropic says it improves on Claude Fable 5 in long-running agentic coding, multistep research, and work on documents, spreadsheets, and slides. Anthropic rates it slower than Claude Opus 5.5.claude-latest uses Claude Fable 5.1. On Anthropic’s own Pro plan, Fable 5.1 sits outside the usage limits and is billed through usage credits; see Claude usage limits explained.
Claude Opus 5.5
Anthropic built Claude Opus 5.5 for long-running agentic coding and knowledge work, at less than half of Fable 5.1’s official price. Anthropic suggests starting most workloads on Opus 5.5 and moving to Fable 5.1 when Opus 5.5 at higher effort still falls short. Like Fable 5.1, it always thinks, so in Capriole AI Fast lowers its effort instead of turning thinking off.Gemini 4 Argon
Google calls Gemini 4 Argon its most capable model, built to solve the hardest problems. Google says it can reason longer on complex coding, agentic, math, and science tasks. Its 1M-token context window is shared by input, thinking, and output.google-latest uses Gemini 4 Argon.
Other models
These models are also available in web chat and on the API.
In the web chat model menu, GPT-6.1 Sol, GPT-6 Sol, GPT-6 Luna, and earlier versions such as Claude Fable 5 and Gemini 3.1 Pro are under More models. Earlier versions stay available for existing chats and API setups.
Thinking or Fast
Most models in web chat come as a pair of presets. Select Thinking or Fast next to the model menu in the message box.- Thinking reasons more before it answers, for complex tasks. Claude Thinking presets show a summary of their thinking.
- Fast uses lower reasoning effort for quicker replies.
The Thinking presets are web chat only. On the API, call the model’s ID and set the reasoning option in your request when you need more reasoning.
Switch models in the middle of a chat
Choose another model from the model menu and send your next message. The chat keeps its history, and the new model answers from there. How switching models mid-chat works. With Enable model auto-switching turned on in Account → Settings, Capriole AI can answer with another available model when the one you chose is under high demand. It is off by default.Model IDs for the API
The API base URL ishttps://api.caprioletech.com. Use a concrete model ID to pin one model, or a *-latest alias to follow our recommended flagship for that provider.
The flagship IDs are
openai/gpt-6-astra, anthropic/claude-fable-5-1, anthropic/claude-opus-5-5, and google/gemini-4-argon. On Anthropic Messages, use bare Claude IDs such as claude-opus-5-5. Call GET /v1/models for the current list, or see List models.
Capriole AI counts charged tokens the same way on every model: uncached input, plus 10% of cached input, plus output. Charged tokens explained has examples.
For pictures, choose Image in the model menu and pick GPT Image 2.5 or Nano Banana 2.1. Image models work in web chat only. See the image generation guide.
Common questions
Which model does Capriole AI use by default?
Web chat starts on GPT-6 Astra Thinking. On the API,openai-latest uses GPT-6 Astra.
Do flagship models cost more in Capriole AI?
Not in web chat: Premium and Team chat is unlimited on every supported model. On the API, every model costs the same per token, USD 8 per 5M tokens, so the saving against official prices is largest on the flagships. Claude API pricing, OpenAI API pricing, and Gemini API pricing work through the numbers.Can I use Claude or Gemini with the OpenAI SDK?
Yes. OpenAI Chat Completions accepts every public model ID, includinganthropic/claude-fable-5-1 and google/gemini-4-argon, plus the three aliases. The OpenAI and Anthropic SDK guide shows the setup.
Can I use the Thinking presets through the API?
No. They are web chat only. Call the model’s API ID and set the reasoning option in your request.Which Claude model should I start with?
Anthropic suggests starting most work on Claude Opus 5.5 and moving to Claude Fable 5.1 for demanding reasoning and long-horizon agentic work. Claude vs ChatGPT compares both with GPT-6 Astra.Official sources
- OpenAI: GPT-6 Astra, GPT-6.1 Sol, GPT-6 Sol, and GPT-6 Luna
- Anthropic: Claude Fable 5.1 and Claude Opus 5.5
- Google: Gemini 4 Argon and Gemini API pricing
- xAI: Grok 4.7
- Z.ai: GLM 5.3 Flash and Z.ai pricing
- Moonshot AI: Kimi K3.1 Pro and Kimi pricing