Bring your own key: SpaceXAI's API rates, no markup. Keys and chats stay in your browser. Run SpaceXAI in parallel with other models, then compare and merge the answers.
Grok, from SpaceXAI (formerly xAI), is the one frontier model with native access to X. Big-AGI exposes that directly: search X with a handle filter, set a recency interval from a day to a year, or run live web search and a code sandbox alongside it. Real-time, on your own SpaceXAI key, in a workspace built for it instead of a chat box.
Then put Grok's real-time read next to Claude and GPT in Beam and see exactly where they diverge.
Grok 4.5
NEWxAI's smartest and fastest model with frontier performance on coding, knowledge work, and STEM - recommended by xAI for both chat and code. 500K token context…
500K
$2
$6
Jul 2026
Grok Build 0.1
xAI fast coding model with reasoning, function calling, and structured outputs. Text and image inputs, 256K context. Aliases: grok-code-fast-1, grok-code-fast,…
256K
$1
$2
May 2026
Grok 4.3
xAI's latest flagship model with reasoning and a 1M token context window. Supports text and image inputs, with reasoning_effort control (none/low/medium/high/x…
1M
$1.25
$2.5
Apr 2026
Grok 4.20
xAI flagship model with a 1M token context window. Non-reasoning variant for fast, high-quality responses with text and image inputs.
1M
$1.25
$2.5
Mar 2026
Grok 4.20 Reasoning
xAI flagship reasoning model with a 1M token context window. Deep reasoning and problem-solving with text and image inputs.
1M
$1.25
$2.5
Mar 2026
Grok 4.20 Multi-Agent
Multi-agent model that runs specialized agents in parallel for collaborative verification with reduced hallucination. Reasoning effort selects 4 vs 16 agents.
1M
$1.25
$2.5
Mar 2026
Grok 4.5
NEWxAI's smartest and fastest model with frontier performance on coding, knowledge work, and STEM - recommended by xAI for both chat and code. 500K token context…
Grok Build 0.1
xAI fast coding model with reasoning, function calling, and structured outputs. Text and image inputs, 256K context. Aliases: grok-code-fast-1, grok-code-fast,…
Grok 4.3
xAI's latest flagship model with reasoning and a 1M token context window. Supports text and image inputs, with reasoning_effort control (none/low/medium/high/x…
Grok 4.20
xAI flagship model with a 1M token context window. Non-reasoning variant for fast, high-quality responses with text and image inputs.
Grok 4.20 Reasoning
xAI flagship reasoning model with a 1M token context window. Deep reasoning and problem-solving with text and image inputs.
Grok 4.20 Multi-Agent
Multi-agent model that runs specialized agents in parallel for collaborative verification with reduced hallucination. Reasoning effort selects 4 vs 16 agents.
1
Create an API key at the SpaceXAI console.
2
Paste it into Big-AGI's model settings.
3
Start chatting, or Beam it against other models and fuse the answers.
Add your SpaceXAI API key and use Grok models at SpaceXAI's own API rates. Big-AGI isn't a reseller: no markup and no intermediary, so SpaceXAI bills you directly. SpaceXAI is the former xAI, now merged into SpaceX; the API and console still live at x.ai.
The Grok app is one model in one interface. Big-AGI runs Grok next to GPT, Claude, Gemini, and anything else you've connected, side by side in the same conversation, which the Grok app isn't built to do.
It also exposes what the app hides: reasoning effort and temperature are real parameters on SpaceXAI's reasoning models, set per request instead of the app's default. Your keys stay in your browser instead of a SpaceXAI account.
The billing model changes too: SpaceXAI charges per token, so a light user can spend less in a month than a subscription costs, and a heavy user never hits an artificial cap, just a bill for tokens used. Beam parallel runs do cost more, the honest tradeoff for comparing models side by side.
Turn on Direct Connection under SpaceXAI's Advanced settings and the browser calls SpaceXAI directly, bypassing the Big-AGI server, whenever your key is client-side and the API allows it. Your keys stay in your browser. Chats are stored locally first and sync only if you turn it on. The AI Inspector shows the exact request before it goes out: model, parameters, token counts, and a cost estimate.
Beam runs Grok against GPT, Claude, Gemini, or any other model you've connected, in parallel, then hands you Fusions: several strategies that combine, cross-check, and synthesize the parallel answers, which beats just picking the best one. Parallel runs use more tokens than a single chat.
Your key, your data, your choice of model. Big-AGI is open source and self-hostable, so you can check exactly how SpaceXAI is called.
BIG-AGI
Resources
© 2026 Token Fabrics·Built with passion in San Diego