xAI

Grok 4.7

xAI

Grok 4.7 is a proprietary xAI language-model release. The September frontier update improves coding, agentic tasks, and knowledge work and is available through the API. It uses text and image inputs and text output, configurable reasoning effort, and tool interfaces. A faster serving option uses the same underlying model and is recorded as a deployment variant, not a separate checkpoint. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok 4.6

xAI

Grok 4.6 is a proprietary xAI language-model release. The August frontier update targets reliable coding, agentic workflows, and analytical knowledge work. It supports text and image understanding with textual responses, configurable reasoning, function calling, and structured outputs. Architecture and parameter count remain undisclosed, and task-level improvements do not guarantee factual accuracy. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok Voice Think Fast 2.0

xAI

Grok Voice Think Fast 2.0 is xAI’s reasoning-enabled spoken-dialogue model. It combines low-latency speech interaction with reasoning and tool use for voice assistants. The model can answer spoken questions and take multi-step actions through application tools, so it is distinct from speech transcription or standalone text-to-speech. The second generation improves spoken reasoning, instruction following, and agent tasks over the first version. Its parameter count and detailed architecture are not disclosed. Real-time latency and interaction quality also depend on transport, audio capture, and the surrounding application.

Grok 4.5

xAI

Grok 4.5 is a proprietary xAI language-model release. A frontier model for software engineering, multi-step agents, and knowledge work. It supports image and text inputs, configurable reasoning effort, function calling, and structured outputs. The API changelog dates availability to July 8, before the July 16 public announcement. There is no stated text-output token cap in the current endpoint documentation. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok Build 0.1

xAI

Grok Build 0.1 is a proprietary xAI language-model release. A coding model trained specifically for long agentic software-engineering workflows. It is distinct from the Grok Build client application: the released model has its own API slug and training specialization. The developer changelog records early access on May 19, followed by the broader May 29 announcement. Architecture, parameter count, and a stable context specification are not disclosed in the cited release. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok Voice Think Fast 1.0

xAI

Grok Voice Think Fast 1.0 is xAI’s reasoning-enabled spoken-dialogue model. It combines low-latency speech interaction with reasoning and tool use for voice assistants. The model can answer spoken questions and take multi-step actions through application tools, so it is distinct from speech transcription or standalone text-to-speech. The first version adds reasoning while maintaining conversational responsiveness. Its parameter count and detailed architecture are not disclosed. Real-time latency and interaction quality also depend on transport, audio capture, and the surrounding application.

Grok 4.3

xAI

Grok 4.3 is a proprietary xAI language-model release. A configurable-reasoning model for coding, tool workflows, and general knowledge work. It accepts images and text, supports structured output and function calling, and permits none, low, medium, or high reasoning effort. The provider model documentation establishes the capabilities; the public integration catalog supplies the April release date because the current provider page does not state it. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok 4.20

xAI

Grok 4.20 is a proprietary xAI language-model release. The publicly documented API release improves coding, knowledge work, instruction following, and hallucination behavior. Reasoning and non-reasoning endpoints are joined by a multi-agent serving option that runs parallel cooperative agents. The multi-agent orchestration is grouped as a variant rather than assigned a speculative new architecture. Earlier consumer beta reports do not establish a precise primary-source availability date. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok 4.1 Fast

xAI

Grok 4.1 Fast is a proprietary xAI language-model release. The tool-oriented fast tier improves agent task performance and instruction following while retaining a two-million-token context. It was offered through the API with reasoning and non-reasoning variants. Later endpoint retirement redirects access to newer models; this page describes the original released tier. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok 4.1

xAI

Grok 4.1 is a proprietary xAI language-model release. A consumer-facing update emphasizing conversational quality, creative writing, emotional understanding, and reduced hallucination. It was released in the Grok app and website, with thinking and standard modes. Its parameter count and network architecture are not publicly disclosed. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok 4 Fast

xAI

Grok 4 Fast is a proprietary xAI language-model release. A low-latency long-context model for information retrieval, tool use, and agent workflows. Reasoning and non-reasoning service variants share its underlying family. The API originally supported a two-million-token context. Later API retirement and alias migration to Grok 4.3 do not change the historical checkpoint identity. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok Code Fast 1

xAI

Grok Code Fast 1 is a proprietary xAI language-model release. A coding specialist trained for interactive software engineering and agentic coding tools. It prioritizes responsiveness and repeated tool calls for repository work across common programming languages. The later migration of its API alias to Grok 4.3 is a service change rather than a new release of this checkpoint. Weights are not publicly downloadable. Published agent and coding results depend on the evaluation harness, tool permissions, and inference settings, so no unsupported standalone benchmark score is assigned.

Grok 4

xAI

xAI's latest generation model with enhanced mathematical reasoning capabilities, showing significant improvements in competition-level mathematics benchmarks. Features 2x faster end-to-end latency, supports 5 different voices, and achieves 10x daily user seconds compared to previous models.

Grok 3 Mini

xAI

A smaller, more efficient version of Grok 3 from xAI. Represents a new frontier in cost-efficient reasoning, particularly strong on STEM tasks that don't require as much world knowledge. Also features test-time compute and reasoning capabilities through the Grok 3 mini (Think) variant, achieving impressive performance on mathematical and coding benchmarks while being more resource-efficient than the full Grok 3 model.

Grok 3

xAI

xAI's most advanced model yet, blending superior reasoning with extensive pretraining knowledge. Trained on the Colossus supercluster with 10x the compute of previous state-of-the-art models. Features test-time compute and reasoning capabilities through reinforcement learning, allowing it to think for seconds to minutes while correcting errors and exploring alternatives. Achieved an Elo score of 1402 in the Chatbot Arena.

Grok-2 mini

xAI

Grok-2 mini is a small but capable sibling of Grok-2 that offers a balance between speed and answer quality. It demonstrates significant improvements over Grok-1.5 while maintaining faster inference speeds compared to the full Grok-2 model.

Grok-2

xAI

xAI's Grok-2 is a significant step forward from Grok-1.5, featuring frontier capabilities in chat, coding, and reasoning. It outperformed Claude 3.5 Sonnet and GPT-4-Turbo on the LMSYS leaderboard and shows significant improvements in reasoning with retrieved content and tool use capabilities.

Grok 1

xAI

First model from Elon Musk's xAI, reportedly with 314B parameters. Deployed in the Grok chatbot with real-time access to X (Twitter) data. Offered an 8K context and aimed to provide up-to-date information via integration with social media.