Grok 4.6

Overview

Grok 4.6 is a SpaceXAI reasoning model in the Grok 4 family, released on August 12, 2026 for coding, long-running agents, interactive and visual projects, and knowledge work. Available through the API as grok-4.6, it supports text and image input, text output, a 500,000-token context window, and four configurable reasoning-effort levels.

Key Features

• Long-Horizon Agentic Work: Trained on agentic reinforcement-learning tasks across knowledge work, general coding, kernel optimization, web development, and computer-aided design, with an emphasis on sustaining complex work across many steps.
• Configurable Reasoning: Supports low, medium, high, and xhigh reasoning effort, with high as the default. Reasoning cannot be disabled, and the API can stream summarized reasoning content.
• Coding and Knowledge-Work Evaluations: SpaceXAI reports 69.9% on CursorBench v3.2, 65.9% on DeepSWE v1.1, 61.3% on FrontierCode v1.1 Extended, and 57.5% on APEX-Agents.
• Long Multimodal Context: Accepts text and image input within a 500,000-token context window and returns text output. Prompts at or above 200,000 tokens use long-context pricing.
• Structured Agent Workflows: Supports function calling, parallel tool calls, structured outputs, and built-in tools such as web search and X search.

Best Use Cases

• Repository-Scale Software Engineering: Implementing features, debugging, refactoring, and validating changes across large codebases or long-running coding sessions.
• Interactive Product Prototypes: Turning a broad product idea into a working application, including its structure, visual language, and core interactions, then iterating from feedback.
• Tool-Using Research Agents: Combining reasoning with web or X search, custom functions, structured outputs, and repeated verification steps.
• Technical Knowledge Work: Analyzing documents and images or producing technical artifacts across science, engineering, mathematics, and other professional domains.

Capabilities and Limitations

Capability	Description
Reasoning	Supports low, medium, high, and xhigh reasoning effort; high is the default and reasoning cannot be disabled. Official results include 61 on the AA Intelligence Index and 1,753 on GDPVal-AA v2.
Coding	Designed for long-running agentic coding and technical workflows. Official results include 69.9% on CursorBench v3.2, 65.9% on DeepSWE v1.1, 61.3% on FrontierCode v1.1 Extended, and 26% on Terminal-Bench v3.0.
Creative Writing	Supports general text generation and document creation.
Multimodal	Text and image input with text output.
Response Speed	SpaceXAI has not published a model-specific latency or tokens-per-second figure.
Context Window	500,000 tokens. Prompts at or above 200,000 tokens are billed at the long-context rates for all tokens in the request.
Max Output	SpaceXAI's release notes state that the model has no text output limit.
Tool Use	Function calling, parallel tool calls, structured outputs, and built-in tools including web search and X search. The Responses API also supports code execution, file or collections search, and Remote MCP tools.
Multilingual	Natural-language prompting is supported.
Knowledge Cutoff	February 1, 2026.

Known Limitations

• logprobs and top_logprobs are not supported by Grok 4.20 and newer models. Reasoning requests also reject presencePenalty, frequencyPenalty, and stop.
• SpaceXAI has not published a model-specific throughput figure, multilingual evaluation, or separate numeric output-token ceiling.

Credits Usage

Model and Context Tier	Input (Credits/Token)	Cache Write (Credits/Token)	Cache Read (Credits/Token)	Output (Credits/Token)
Grok 4.6	2.00	2.00	0.50	6.00
Grok 4.6 (>=200K prompt tokens)	4.00	2.00	1.00	12.00

• Once a prompt reaches 200,000 tokens, long-context rates apply to all input, cached input, reasoning, and output tokens in the request. Reasoning tokens are billed at the output-token rate.

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.