SpaceXAI: Grok 4.3
Grok 4.3 is a model from x-ai, listed here as SpaceXAI: Grok 4.3, that accepts text, image, and file inputs. It offers a 1,000,000-token context window and allows up to 900,000 completion tokens, so it can take in very large documents and return long outputs. It supports tool use and reasoning. Structured output support and open-weights status are not specified, and it is not free. At $1.25 per million input tokens and $2.50 per million output tokens, it suits teams that need long-context processing without paying top-tier rates. Its blended benchmark score is 58.6 across three independent benchmarks. The split matters: it scores 69.7 on coding, 62.0 on the general index, and 39.8 on agentic tasks. Shortlist it for coding and large-document work. If your workload depends on multi-step agentic execution, test it against alternatives first, since that is its weakest measured area.
Benchmark results
Independent, published benchmarks. Blended score 58.6 across 3 benchmarks, last refreshed 2026-11-08. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 62.0 |
| AI Index Coding | software engineering tasks | 69.7 |
| AI Index Agentic | multi-step tool-using tasks | 39.8 |
- Model ID
- x-ai/grok-4.3
- Vendor
- x-ai
- Released
- April 2026
- Tokenizer
- Grok
- Input Modalities
- text, image, file
- Output Modalities
- text
- Max Output
- 900,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- no
What it costs in practice
Computed from the current $1.25/M input and $2.50/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.04 |
| Classify 1,000 customer emails | 500k in / 50k out | $0.75 |
| A month of a busy support chatbot | 5M in / 2M out | $11.25 |
Similar models
SpaceXAI: Grok 4.7
SpaceXAI: Grok 4.7 (batch)
SpaceXAI: Grok 4.6
SpaceXAI: Grok 4.6 (batch)
SpaceXAI: Grok 4.5
SpaceXAI: Grok Build 0.1
Quick answers
- How much does SpaceXAI: Grok 4.3 cost?
- $1.25 per million input tokens and $2.50 per million output tokens.
- What is SpaceXAI: Grok 4.3's context window?
- 1,000,000 tokens, roughly 1,500 pages of text in a single request.
- Does SpaceXAI: Grok 4.3 support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can SpaceXAI: Grok 4.3 process images?
- Yes, it accepts image input.