Run Grok 4.20 (reasoning / non-reasoning / multi-agent) free on Cloudflare within the daily free allowance.
Grok 4.20 提供多种运行档位，适配不同的延迟与质量需求：
xai/grok-4.20-0309-reasoning）。xai/grok-4.20-0309-non-reasoning）。xai/grok-4.20-multi-agent-0309）。在 Cloudflare（每日免费额度）与 Vercel（$5/月）均可免费调用。
Grok 4.20 由 Cloudflare 账户直接计费、免任何额外 Key，落在每日免费额度内即 0 成本。
可选模型 id：
xai/grok-4.20-0309-reasoning（扩展推理）xai/grok-4.20-0309-non-reasoning（极速）xai/grok-4.20-multi-agent-0309（多智能体）curl https://api.cloudflare.com/client/v4/accounts/$CF_ACCOUNT_ID/ai/run/xai/grok-4.20-0309-reasoning \
-H "Authorization: Bearer $CF_API_TOKEN" \
-H "Content-Type: application/json" \
-d '{"messages":[{"role":"user","content":"Plan a 3-step refactor."}]}'export default {
async fetch(request, env) {
const res = await env.AI.run('xai/grok-4.20-0309-reasoning', {
messages: [{ role: 'user', content: 'Plan a 3-step refactor.' }],
});
return Response.json(res);
},
};