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.
Standard Pricing
The token prices below are shown in USD per 1 million tokens; web search is billed in USD per use.
| Model and Context Tier | Input (USD / 1M Tokens) | Cache Write (USD / 1M Tokens) | Cache Read (USD / 1M Tokens) | Output (USD / 1M Tokens) | Web Search (USD / use) |
|---|---|---|---|---|---|
| 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 | - |
Credits settlement: B.AI converts charges at 1 USD = 1,000,000 Credits and deducts Credits from the account balance.
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 account benefits. Specific prices and account benefits are subject to the platform display and final billing records.