Skip to main content

​
xAI (Grok)

POST https://api.x.ai/v1/chat/completions
Uses SSE streaming with OpenAI-compatible tool-calling format. Supports vision (base64 images) and reasoning content. xAI offers Grok models with strong reasoning capabilities and competitive pricing. Grok 4.3 is the flagship with 1M context, vision support, and three reasoning modes — sitting between the budget Chinese providers and the premium Western tier on price. The newer Grok Build model is purpose-built for code generation at an attractive price point. Best for: Reasoning-heavy workflows, code generation, vision tasks, and agentic automations where you want a balance of capability and cost.

​
Getting an API Key

  1. Go to console.x.ai
  2. Sign up or log in
  3. Navigate to API Keys and create a new key
  4. Paste it into Wolffish → Settings → Models → xAI

​
Models

ModelModesContextInput / Output (per MTok)Cached
grok-4.3Off, High1M1.25/1.25 / 2.50—
grok-4.20-0309-reasoningOn256K1.25/1.25 / 2.50—
grok-4.20-0309-non-reasoning—256K1.25/1.25 / 2.50—
grok-build-0.1On256K1.00/1.00 / 2.00—

​
Reasoning modes

The brain icon next to the message box controls how this model reasons. Click it to cycle through the modes the selected model supports. Two separate ideas combine here:

​
Thinking — whether the model reasons

  • Off — the model answers immediately. Fastest and cheapest; ideal for simple, direct tasks.
  • On — the model first works through the problem in a dedicated reasoning pass before replying. Slower and uses more tokens, but markedly more accurate on multi-step, logical, or ambiguous tasks.

​
Effort — how hard it thinks

Only effort-capable models expose this; it applies once thinking is on.
  • High — standard reasoning depth. The right default for most agentic work.
  • Max — the model reasons longer and deeper for the hardest problems. More tokens and latency in exchange for higher quality on complex work.

​
Button states

StateColourMeaning
OffgrayThinking off — direct answer
OnblueThinking on — no effort control
HighpurpleThinking on, standard effort
MaxorangeThinking on, maximum effort
Each model shows only the states it genuinely supports. If a model always reasons (can’t be turned off) or has no effort control, the button reflects that and locks where there’s nothing to change. Wolffish remembers your choice per model. On xAI: grok-4.3 supports Off / High. grok-4.x and grok-build reason always-on, so the button stays locked on; non-reasoning grok variants have no control.
Grok 4.3 is competitively priced against Anthropic and OpenAI while offering 1M context and vision. If you need a mid-tier provider with strong reasoning that’s cheaper than Claude or GPT, xAI is a solid choice.