Grok 4.3

Grok 4.3 is an xAI model positioned as a unifying successor within the Grok family. In xAI's May 15, 2026 developer migration documentation, Grok 4.3 is explicitly named as the redirect target for several prior Grok endpoints that were retired on that date, including the Grok 4 fast reasoning and non-reasoning variants, grok-4-0709, grok-3, and related slugs. Reasoning-mode requests land on Grok 4.3 with low reasoning effort, while non-reasoning requests are served with reasoning disabled, making it the practical fallback for nearly the entire previous Grok lineup on the xAI API. This consolidating role signals a deliberate shift by xAI toward a single flagship reasoning model rather than a sprawling set of variants.

The model's fit is shaped by its benchmark placement and a sharp pricing reset. Reporting from Fello AI records Grok 4.3 scoring 53 on the Artificial Analysis Intelligence Index, placing it above Claude Sonnet 4.6 but below GPT-5.5, Claude Opus 4.7, and Gemini 3.1 Pro Preview, which frames it as a mid-frontier rather than top-tier option. The release followed an earlier $300-per-month SuperGrok Heavy beta, with broader API availability around April 30, 2026, and an input price roughly 40% lower than Grok 4.20 alongside an output price cut closer to 60%. Together, those moves position Grok 4.3 as a cost-conscious workhorse for developers who want Grok-style reasoning and tool use without paying premium-frontier rates.

Aurikogrok-4.3grok

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Quick Info

Provider: Auriko
Model key: grok-4.3
Release date: Apr 17, 2026
Last updated: Apr 17, 2026
Input modalities
Output modalities
Capabilities

Cost

Input token cost: $1.25
Output token cost: $2.50

Limits

Output tokens: 30,000 tokens
Context window: 1,000,000 tokens

Transparent token rates

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Rates are shown per one million tokens. Combined means one million input plus one million output tokens.

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Latest news about Grok 4.3

302.AI

CoverageBenchmark

Coursiv's coding-focused review highlights Grok 4.3 as a long-context, low-cost option for codebase reading, debugging, test generation, and API automation, citing a 1 million-token context window and xAI API support. It frames Grok 4.3 alongside the Grok Build terminal coding agent and real-time web/X research integra The same article recommends caution versus Claude Code or Codex for high-stakes multi-file refactors, mature coding-agent workflows, and ecosystem depth, and positions Grok 4.3 as useful as a second-pair-of-eyes code reviewer. A July 24, 2026 update note states that Grok 4.5 is now xAI's flagship coding model, but expl

xAI

CoverageBenchmark

Grok 4.3 is a new xAI API model designed around faster reasoning, stronger instruction following, and agentic tool use, positioned for developers building on the xAI API. The model appears as grok-4.3 in developer-facing material, with a 1M-token context window and a price-performance profile aimed at repeated API workloads, while Grok 4.20 is described as still relevant for workflows needing a 2M-token context tier. Beyond headline token prices, Grok 4.3 can incur extra usage costs when paired with server-side tools such as web search, X search, file search, code execution, or retrieval, which materially affects agentic application economics. The release therefore favors cost control and reasoning quality for autonomous research agents, support bots, coding assistants, and retrieval-heavy internal tools that do not need the largest available input window.

xAI

CoverageBenchmark

Grok 4.3 is listed as a reasoning model from xAI with a 1,000,000-token context window, no output token limit, and support for text and image inputs producing text output, making it suitable for long-document analysis, deep research, and multi-step agentic tasks. Reasoning effort can be configured across none, low, medium, and high levels, with low set as the default, and the model was released on April 30, 2026. API pricing is listed at $1.25 per 1M input tokens and $2.50 per 1M output tokens, doubling for requests exceeding 200k total tokens, with a separate cache read rate of $0.20 per 1M tokens. These figures reflect gateway-routed access and may differ from xAI direct pricing, so they should be treated as third-party reference data rather than official xAI rates.