Migrate off Grok 4.1 Fast (Reasoning)
RetiredGrok 4.1 Fast (Reasoning) has been retired and shut down on 15 May 2026. xAI's official replacement is Grok 4.3. The cheapest comparable model we track is Grok Build 0.1 (xAI) at $1.25 per 1M tokens blended.
Last verified: 13 Aug 2026 · sourced from official provider documentation
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Grok 4.1 Fast (Reasoning) → Grok 4.3
| Spec | Grok 4.1 Fast (Reasoning) | Grok 4.3 |
|---|---|---|
| Status | Retired | GA |
| Blended price /1M | — | $1.56 |
| Input / output /1M | — | $1.25 / $2.50 |
| Context window | — | 1M |
| Max output | — | — |
| Modality | text-in, image-in, text-out | text-in, image-in, text-out |
| Knowledge cutoff | — | — |
API string was grok-4-1-fast-reasoning → switch to grok-4.3. See Grok 4.3's full spec sheet →
Budget-friendly replacements for Grok 4.1 Fast (Reasoning)
Generally-available models that match Grok 4.1 Fast (Reasoning)'s capabilities, ranked by blended price. Every number is computed from official catalog prices.
| Model | Blended /1M | Input / output | Context |
|---|---|---|---|
| Grok Build 0.1 xAI | $1.25 | $1 / $2 | 256K |
| Grok 4.20 (0309) Reasoning xAI | $1.56 | $1.25 / $2.50 | 1M |
| Grok 4.20 (0309) Non-Reasoning xAI | $1.56 | $1.25 / $2.50 | 1M |
Migrating off Grok 4.1 Fast (Reasoning)
What replaces Grok 4.1 Fast (Reasoning)?
xAI's recommended migration for Grok 4.1 Fast (Reasoning) is Grok 4.3. The cheapest comparable model in our catalog is Grok Build 0.1 (xAI) at $1.25/1M blended.
Is Grok 4.1 Fast (Reasoning) still available?
No — Grok 4.1 Fast (Reasoning) has been retired (shut down 15 May 2026) and is no longer available via xAI's API.
What is the cheapest alternative to Grok 4.1 Fast (Reasoning)?
Grok Build 0.1 (xAI) is the cheapest generally-available alternative we track that matches Grok 4.1 Fast (Reasoning)'s capabilities, at $1 per 1M input and $2 per 1M output tokens ($1.25/1M blended).
Browse the full deprecation watch → or see Grok 4.1 Fast (Reasoning)'s full spec sheet →
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