Grok 4.5
Overview
Grok 4.5 is a SpaceXAI reasoning model for coding, agentic tasks, engineering, and knowledge work. On B.AI, use the model ID grok-4.5.
Key Features
- Agentic Engineering: Suitable for multi-step coding, debugging, refactoring, and repository-scale work.
- Configurable Reasoning: Supports reasoning-effort controls for balancing response speed and depth.
- Long Multimodal Context: Supports text and image input within a 500,000-token context window and returns text output.
- Tool-Using Workflows: Supports function calling and structured outputs, with additional tool capabilities depending on API configuration.
- Long-Context Pricing: Requests with more than 200,000 prompt tokens use the long-context pricing tier.
Best Use Cases
- Repository-scale coding, including implementation, debugging, refactoring, and technical review.
- Tool-using agents that combine structured output, function calling, and repeated reasoning loops.
- Technical analysis across engineering, science, mathematics, and mixed text/image materials.
- Long-context document and knowledge-work workflows.
Capabilities and Limitations
| Capability | Detailed Description |
|---|---|
| Reasoning | Supports configurable reasoning effort for tasks with different latency and depth requirements. |
| Coding | Suitable for multi-step software engineering and technical problem-solving workflows. |
| Multimodal | Supports text and image input with text output. |
| Context Window | Supports up to 500,000 tokens. |
| Tool Use | Supports function calling and structured outputs; tool availability depends on API configuration. |
| Multilingual | Suitable for natural-language technical and knowledge-work requests. |
Known Limitations
- The model can produce inaccurate responses; validate results before using them in critical workflows.
- Requests with more than 200,000 prompt tokens use the long-context pricing tier for the request.
- Actual tool availability and related charges depend on the real-time options exposed by the platform.
Credits Usage
| Model and Context Tier | Input (Credits/Token) | Cache Write (Credits/Token) | Cache Read (Credits/Token) | Output (Credits/Token) |
|---|---|---|---|---|
| Grok 4.5 | 2.00 | 2.00 | 0.30 | 6.00 |
| Grok 4.5 (>200K prompt tokens) | 4.00 | 4.00 | 0.60 | 12.00 |
Pricing note
Prices shown in the documentation are B.AI standard reference prices for base billing purposes. B.AI may provide lower actual usage costs through top-up bonuses and account benefits. Specific prices, bonus Credits, and account benefits are subject to the platform display and final billing records.