The model library

Find your possibilities.

Choose by what you want to make.
Compare what each model can do in Celeste.

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Streaming

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Grok 3 Mini

xAI

grok-3-mini

text.generate

StreamingTool callingStructured output

Grok 4

xAI

grok-4-0709

text.generate

StreamingTool callingStructured output

Grok 4 Fast Non-Reasoning

xAI

grok-4-fast-non-reasoning

text.generate

StreamingTool callingStructured output

Grok 4 Fast Reasoning

xAI

grok-4-fast-reasoning

text.generate

StreamingTool callingStructured output

Grok 4.1 Fast Non-Reasoning

xAI

grok-4-1-fast-non-reasoning

text.generate

StreamingTool callingStructured output

Grok 4.1 Fast Reasoning

xAI

grok-4-1-fast-reasoning

text.generate

StreamingTool callingStructured output

Grok 4.20 Beta 0309 Non Reasoning

xAI

grok-4.20-beta-0309-non-reasoning

text.generate

StreamingTool callingStructured output

Grok 4.20 Beta 0309 Reasoning

xAI

grok-4.20-beta-0309-reasoning

text.generate

StreamingTool callingStructured output

Capabilities come from the published Celeste SDK. Support varies by model. Test your prompts when switching.

Side by side

Find the right fit.

Selected model capabilities
In the SDK
Provider
Operations
Streaming
Controls

These are SDK capabilities, not quality rankings. Choose a model, then evaluate it for your use case.