Grok 4.3
Summary
Grok 4.3 is a proprietary language model from xAI, released on 17 Apr 2026. It accepts text, images and PDFs and generates text, with a 1M-token context window and up to 30K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $1.25 per million input tokens and $2.50 per million output tokens (xAI API), across 5 providers we track.
xAI's Grok for chat, coding, agentic tools, and lower hallucination risk
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | xAI |
|---|---|
| Release date | 17 Apr 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 1M (1,000,000 tokens) [models.dev] |
| Max output | 30K tokens [models.dev] |
| Knowledge cutoff | Nov 2024 [models.dev] |
| Input | Text, images and PDFs [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
Grok 4.3 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| xAI API grok-4.3 | $1.25 | $2.50 | $0.20 | 1M | models.dev, 4 Oct 2026 |
| Amazon Bedrock xai.grok-4.3 | $1.25 | $2.50 | $0.20 | 1M | models.dev, 4 Oct 2026 |
| Google Vertex AI xai/grok-4.3 | $1.25 | $2.50 | $0.20 | 200K | models.dev, 4 Oct 2026 |
| Vercel AI Gateway spacexai/grok-4.3 | $1.25 | $2.50 | $0.20 | 1M | models.dev, 4 Oct 2026 |
| OpenRouter x-ai/grok-4.3 | $1.25 | $2.50 | $0.20 | 1M | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of Grok 4.3?
Grok 4.3 has a context window of 1,000,000 tokens (1M) and can generate up to 30,000 tokens in a single response, according to models.dev.
How much does the Grok 4.3 API cost?
Through xAI API, Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens. Prices last verified 4 Oct 2026.
Is Grok 4.3 open source?
No. Grok 4.3 is a proprietary model; xAI has not released its weights. It is available through APIs including xAI API, Amazon Bedrock, Google Vertex AI, Vercel AI Gateway.
When was Grok 4.3 released?
xAI released Grok 4.3 on 17 Apr 2026, according to models.dev.
Which providers offer Grok 4.3?
We track Grok 4.3 on 5 providers: xAI API, Amazon Bedrock, Google Vertex AI, Vercel AI Gateway, OpenRouter.
Change history
No changes detected since we started tracking this model. We re-check every source daily.
Sources
- https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.3.toml
- https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/xai.grok-4.3.toml
- https://github.com/sst/models.dev/blob/dev/providers/google-vertex/models/xai/grok-4.3.toml
- https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-4.3.toml
- https://openrouter.ai/x-ai/grok-4.3