Grok 4.20 Multi-Agent API Pricing
xAI · context window 2M · prices updated 2026-09-15
Where Grok 4.20 Multi-Agent sits on price
At $2.50 per million output tokens, Grok 4.20 Multi-Agent is a mid tier model — 1.2× the median output price of $2.08, which puts it cheaper than 45% and pricier than 55% of the models we track. It sits 4th cheapest of the 7 xAI models we track. Output is only 2.0× the input price, an unusually flat spread: long prompts hurt about as much as long answers, so prompt size is where the savings are.
Cached input is 84% cheaper. On an input-heavy workload you need roughly a 30% cache-hit rate to take 25% off the input line — reachable for chatbots and agents that resend the same system prompt and history.
What real workloads cost on Grok 4.20 Multi-Agent
These three workloads are the ones teams actually run on a mid-priced model — a $2.50/1M model is not bought for the same job as one ten times the price.
| Workload | Per request | Per month |
|---|---|---|
| Support chatbot — 500 conversations/day (5K in / 1.4K out) Conversation history re-sent each turn — the classic prompt-caching win. | $0.0097 | $146 |
| Document pipeline — 10K docs/day (3K in / 500 out) Batch-friendly: no user waiting, so a ~50% batch discount usually applies. | $0.005 | $1500 |
| Long-context analysis — 200 runs/day (250K in / 4K out) Only possible on large-context models; input cost is nearly the whole bill. | $0.3225 | $1935 |
Model your exact traffic in the API cost calculator — it preloads Grok 4.20 Multi-Agent with caching and batch options.
Grok 4.20 Multi-Agent price history
Grok 4.20 Multi-Agent's price has not moved since we began tracking it on Aug 2, 2026 — 44 days of stability in a market where 78 of the 334 models we track have repriced over the same period. xAI's lineup has held steady across the board.
Change-points from our daily price snapshots (tracking since Aug 2, 2026; intraday moves between snapshots are not captured).
Grok 4.20 Multi-Agent vs Nova 2 Lite
The closest-priced alternative from another vendor is Nova 2 Lite (Amazon) — priced within a rounding error on output, with $0.95 less per million input tokens. When two models land this close on price, the decision is quality on your own workload, not the price sheet: run 50 real requests through both and compare.
See Nova 2 Lite pricing →Cheaper alternatives
More xAI models
Frequently asked questions
› How much does the Grok 4.20 Multi-Agent API cost?
Grok 4.20 Multi-Agent costs $1.25 per million input tokens and $2.50 per million output tokens, with cached input at $0.2 per million (84% cheaper). That works out to roughly 400,000 output tokens per dollar.
› What does the support chatbot workload cost on Grok 4.20 Multi-Agent?
Support chatbot — 500 conversations/day (5K in / 1.4K out) costs about $0.0097 per request and $146 per month on Grok 4.20 Multi-Agent. Conversation history re-sent each turn — the classic prompt-caching win.
› What does it cost to fill Grok 4.20 Multi-Agent's 2M context window?
Sending 2M of input in a single request costs $2.50 at $1.25 per million tokens — before any output. With prompt caching that same fill drops to about $0.4 on repeat requests. This is why large context windows are cheap to advertise and expensive to actually use.
› Is Grok 4.20 Multi-Agent worth the price?
Grok 4.20 Multi-Agent sits in the middle of the market (4 of 7 by price within xAI). The honest test is a routing experiment: send the same 200 real requests to this model and to a tier below, and compare failure rate against the price gap — most teams find a majority of traffic never needed the pricier model.