Paid (Cloudflare Unified Billing): Grok 4.20 keyless via Cloudflare — prepaid credits, xAI pass-through pricing. For free, use Vercel.
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）。Vercel 每月 $5 免 Key 额度内免费；Cloudflare 免 Key 但付费（统一计费、原价透传）。
Grok 4.20 经 Cloudflare AI Gateway 的统一计费扣费：先充值（5% 手续费），再按 xAI 原价透传、无加价计费，免单独 xAI Key。第三方模型无免费额度（免费 Neurons 仅对 @cf/ 模型有效）。
好处：一张账单、免各家 Key、可设花费上限。想免费用，走 Vercel（$5/月免 Key）。
Pick a model, paste your own free key, and run. Your key is sent once to call the provider and never stored on our servers.
Pick a model, paste your own free key, and run. Your key is sent once to call the provider and never stored on our servers.
curl https://api.cloudflare.com/client/v4/accounts/$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);
},
};