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Grok 4.2 Fast
xai·xai/grok-4.2-fast·GA·Closed
Fast Grok model for responsive chat, reasoning, and tool-assisted work
At a glance
Reference price$3.00 / $9.00 per 1M
Cache read — · ZenMux
Lowest paid$3.00 / $9.00
ZenMux Gateway
Context2,000,000
Output limit30,000
Capabilities
✓ Reasoning✓ Tool use? Structured output✓ Temperature✓ Attachments
Modalities
TextImageVideo
Knowledge cutoff2025-08-31
Released / updated2026-03-20 / 2026-03-20
Quality & performance
Artificial Analysis doesn't cover this model (267 of 2059 have data). Quality data comes from independent evals covering widely used models.
Available at 1 providers1 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| ZenMux | Gateway | $3.00 | $9.00 | — | — | 2,000,000 | 30,000 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Your usage cost
1ZenMux$1,050.00
The cheapest paid channel is the only channel.
Benchmark
No upstream benchmark data for this model. For quality, see the Artificial Analysis intelligence score above.
Reasoning control
Upstream provides no control info
1 / 1 providers expose no reasoning control (reasoning_options: []).
Related models
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Price historyone sample accumulated per data sync
Input listOutput listMin blended