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Grok Code Fast 1

Retired

Retired as a standalone slug on 2026-05-15 12:00 PM PT; redirects to grok-build-0.1. Note grok-code-fast-1 also persists as an ALIAS of grok-build-0.1 on the current model page, so the name still resolves. 256k context window inferred from grok-build-0.1 (same model lineage).

Grok Code Fast 1 by xAI is tracked live in our LLM catalog, with a 256K (256.000-token) context window. It has been retired (shut down 15 May 2026); the recommended migration is Grok Build 0.1.

Last verified: 13 Aug 2026 · sourced from official provider documentation

Lifecycle warning

This model has been retired. Scheduled shutdown: 15 May 2026. Recommended migration: Grok Build 0.1.

Read the Grok Code Fast 1 migration guide → replacement & cheapest alternatives

Provider
xAI
Status
Retired
Input price
—
Output price
—
Cached input
—
Blended price
—
Context window
256.000 tokens (256K)
Max output
—
Modality
text-in, image-in, text-out
Open weights
No — API only
Knowledge cutoff
—
Released
—
API string
grok-code-fast-1

Source: xAI official documentation ↗

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FAQ

Grok Code Fast 1 — questions & answers

What is the context window of Grok Code Fast 1?

Grok Code Fast 1 has a 256.000-token context window (256K).

Is Grok Code Fast 1 still available?

Grok Code Fast 1 has been retired and is no longer available. Its scheduled shutdown date is 15 May 2026. The recommended migration is Grok Build 0.1.

Does Grok Code Fast 1 support image or vision input?

Yes — Grok Code Fast 1 accepts image input. Listed modalities: text-in, image-in, text-out.

Can I self-host Grok Code Fast 1?

No — Grok Code Fast 1 is proprietary. Its weights are not publicly released, so it is available only through xAI's API (or hosted partners), not for self-hosting.

What is the API model string for Grok Code Fast 1?

The API model identifier for Grok Code Fast 1 is "grok-code-fast-1" when calling xAI's API.