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Models / xAI

Grok 4.3

GA

'Fast, reliable model with strong tool calling and instruction following capabilities' per docs.x.ai/developers/models/grok-4.3. Until 2026-09-18 this note called it the current flagship/recommended model for chat and coding, and claimed a second alias grok-latest; BOTH were read first-hand on 2026-09-18 and neither holds. Flagship is grok-4.6 since 2026-08-12, and the models index publishes exactly one alias for this id: grok-4.3-latest. Modality 'text, image -> text' per the official model page. Function calling, structured outputs, configurable reasoning effort none/low/medium/high/xhigh (default low), Batch API supported. TIERED pricing: figures shown are the base tier for prompts <=200K tokens; prompts >200K are billed 2x ($2.50/M input, $0.40/M cached, $5/M output). Max output tokens not published on the docs page (third-party sources describe 'no output token limit' but xAI does not state it for this id; it does state it for grok-4.6). Knowledge cutoff null as a sourced absence: the models index states a cut-off for grok-4.6 only, and the old note's 'Nov 2024 cutoff for Grok 3 and Grok 4' sentence is no longer on that page. The tail of this note was truncated at ingest and the lost text was about the release date; it could not be restored from a first-party source, because xAI publishes no release date on the model page and its release notes carry no entry for Grok 4.3 at all. The released field is kept as ingested and is NOT first-party-confirmed.

Grok 4.3 by xAI costs $1.25 per 1M input tokens and $2.50 per 1M output tokens ($1.56/1M blended), with a 1M (1.000.000-token) context window. It is generally available (GA).

Last verified: 26 Sep 2026 · sourced from official provider documentation

Provider
xAI
Status
GA
Input price
$1.25 / 1M tokens
Output price
$2.50 / 1M tokens
Cached input
$0.2 / 1M tokens
Blended price
$1.56 / 1M tokens
Context window
1.000.000 tokens (1M)
Max output
—
Modality
text-in, image-in, text-out
Open weights
No — API only
Knowledge cutoff
—
Released
30 Apr 2026
API string
grok-4.3

Source: xAI official documentation ↗

See also

Compare Grok 4.3 head-to-head

Grok 4.3 vs Grok 4.5→

$1.56 vs $3 blended /M · same family

Grok 4.3 vs Grok 4.6→

$1.56 vs $3 blended /M · same family

Grok 4.3 vs Grok 4.7→

$1.56 vs $3 blended /M · same family

FAQ

Grok 4.3 — questions & answers

How much does Grok 4.3 cost?

Grok 4.3 is priced at $1.25 per 1M input tokens and $2.50 per 1M output tokens ($1.56/1M blended at a 3:1 input-to-output ratio), with cached input at $0.2 per 1M tokens.

What is the context window of Grok 4.3?

Grok 4.3 has a 1.000.000-token context window (1M).

Is Grok 4.3 deprecated?

No — Grok 4.3 is generally available (GA) and not currently scheduled for deprecation or retirement in our tracker.

Does Grok 4.3 support image or vision input?

Yes — Grok 4.3 accepts image input. Listed modalities: text-in, image-in, text-out.

Can I self-host Grok 4.3?

No — Grok 4.3 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 4.3?

The API model identifier for Grok 4.3 is "grok-4.3" when calling xAI's API.