Use SpaceXAI Models in Big-AGI.

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 4.5
Grok Build 0.1
Grok 4.3

The model wired into X.

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.

All supported SpaceXAI models

ModelContextInputOutputReleased

Grok 4.5

NEW
VisionReasoningTools / functionsWeb search

xAI'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

VisionReasoningTools / functionsWeb search

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

VisionReasoningTools / functionsWeb search

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

VisionTools / functionsWeb search

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

VisionReasoningTools / functionsWeb search

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

VisionReasoningWeb search

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

NEW
Jul 2026

xAI'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…

VisionReasoningTools / functionsWeb search
500K · in $2 · out $6

Grok Build 0.1

May 2026

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,…

VisionReasoningTools / functionsWeb search
256K · in $1 · out $2

Grok 4.3

Apr 2026

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…

VisionReasoningTools / functionsWeb search
1M · in $1.25 · out $2.5

Grok 4.20

Mar 2026

xAI flagship model with a 1M token context window. Non-reasoning variant for fast, high-quality responses with text and image inputs.

VisionTools / functionsWeb search
1M · in $1.25 · out $2.5

Grok 4.20 Reasoning

Mar 2026

xAI flagship reasoning model with a 1M token context window. Deep reasoning and problem-solving with text and image inputs.

VisionReasoningTools / functionsWeb search
1M · in $1.25 · out $2.5

Grok 4.20 Multi-Agent

Mar 2026

Multi-agent model that runs specialized agents in parallel for collaborative verification with reduced hallucination. Reasoning effort selects 4 vs 16 agents.

VisionReasoningWeb search
1M · in $1.25 · out $2.5
6 models · sorted by release date · prices in USD per 1M tokens · refreshed every 30 minutesCompare every model across vendors →

Get started in 3 steps

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.

Running SpaceXAI in Big-AGI

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.

  • Your key, your billing. Usage is billed by SpaceXAI directly, nothing routes through us.
  • Reasoning effort. Grok's reasoning models take an effort setting, from none up to high, so you trade latency for depth on your terms.
  • X Search, and more. Grok searches X directly, with an optional handle filter, plus general web search and a code sandbox, the only lab wired natively into X. New releases arrive tagged [new] with live pricing, no catalog wait.

Why not just Grok?

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.

Your keys and your data

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.

SpaceXAI in Beam

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.

Bring your SpaceXAI key. Keep control.

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.

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