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X.ai vs X.ai

Grok 4 vs Grok 4.3

Compare Grok 4 and Grok 4.3 across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for benchmark-led evaluation versus long-context workloads.

Grok 4
Jul 09, 2025 256,000 context 256,000 tokens output
Grok 4.3
Apr 30, 2026 1M context 2,000,000 tokens output
Overview ↓ Pricing ↓ Capabilities ↓ Benchmarks ↓ Community ↓ Verdict ↓ FAQ ↓ Related ↓

Overview Comparison

Structured side-by-side differences for the highest-signal model metadata.

Grok 4
Grok 4.3

Provider

The entity that currently provides this model.

Grok 4 X.ai
Grok 4.3 X.ai

Model ID

The routed model identifier exposed by upstream providers.

Grok 4 N/A
Grok 4.3 x-ai/grok-4.3

Input Context Window

The number of tokens supported by the input context window.

Grok 4 256,000 tokens
Grok 4.3 1M tokens

Maximum Output Tokens

The number of tokens that can be generated by the model in a single request.

Grok 4 256,000 tokens tokens
Grok 4.3 2,000,000 tokens tokens

Open Source

Whether the model's code is available for public use.

Grok 4 No
Grok 4.3 No

Release Date

When the model was first released.

Grok 4 Jul 09, 2025
Grok 4.3 Apr 30, 2026

Knowledge Cut-off Date

When the model's knowledge was last updated.

Grok 4 July 2025
Grok 4.3 Unknown

API Providers

The providers that currently expose the model through an API.

Grok 4
xAI
Grok 4.3
OpenRouter

Modalities

Types of data each model can process or return.

Grok 4
Text Code
Grok 4.3
Text Image

Pricing Comparison

Compare current token pricing before you choose the cheaper or more scalable API option.

Grok 4 X.ai
Input price $3.00 Per 1M tokens
Output price $15.00 Per 1M tokens
Grok 4.3 X.ai
Input price $1.25 Per 1M tokens
Output price $2.50 Per 1M tokens

Capabilities Comparison

See where each model overlaps, where they differ, and which one supports more of the features you care about.

Capability
Grok 4
Grok 4.3
Advanced Reasoning Applies multi-step reasoning to expert-level problems in science, mathematics, and coding, trained via reinforcement learning at scale on xAI's 200,000-GPU Colossus cluster.
Grok 4 Supported
Grok 4.3 —
Agentic Task Execution Handles multi-step autonomous tasks, achieving high scores on Vending-Bench, a benchmark designed to evaluate agentic decision-making over extended task sequences.
Grok 4 Supported
Grok 4.3 —
Code Generation Generates, debugs, and explains code across common programming languages, with access to a built-in code interpreter for execution and verification.
Grok 4 Supported
Grok 4.3 —
Image
Grok 4 —
Grok 4.3 Supported
Long Context Window Supports a 256,000-token context window, enabling processing of lengthy documents, codebases, or multi-turn conversations in a single request.
Grok 4 Supported
Grok 4.3 —
Math & Science Problem Solving Achieves 61.9% on USAMO 2025 olympiad math proofs (Grok 4 Heavy) and 50.7% on the Humanity's Last Exam text-only subset, as reported by xAI.
Grok 4 Supported
Grok 4.3 —
Native Tool Use Autonomously selects and operates tools such as a code interpreter and web browser, choosing its own search queries to construct thorough, grounded answers.
Grok 4 Supported
Grok 4.3 —
Parallel Agent Reasoning Grok 4 Heavy runs multiple reasoning agents simultaneously at test time, allowing it to tackle problems that benefit from parallel exploration of solution paths.
Grok 4 Supported
Grok 4.3 —
Real-Time Web Search Integrates live web search and X (Twitter) search — including keyword, semantic, and media search — to retrieve up-to-date information during a response.
Grok 4 Supported
Grok 4.3 —
Reasoning
Grok 4 —
Grok 4.3 Supported
Structured Output
Grok 4 —
Grok 4.3 Supported
Text
Grok 4 Supported
Grok 4.3 Supported
Tools
Grok 4 —
Grok 4.3 Supported

Benchmark Comparison

Shared benchmark rows make it easier to compare performance where both models have published scores.

Benchmark Grok 4 Grok 4.3
AIME 2024
American math olympiad problems
Grok 4 94.3%
Grok 4.3 N/A
AIME 2025
American math olympiad problems (2025)
Grok 4 91.7%
Grok 4.3 N/A
GPQA Diamond
PhD-level science questions (biology, physics, chemistry)
Grok 4 87.7%
Grok 4.3 N/A
HLE
Questions that challenge frontier models across many domains
Grok 4 23.9%
Grok 4.3 N/A
LiveCodeBench
Real-world coding tasks from recent competitions
Grok 4 81.9%
Grok 4.3 N/A
MATH-500
Undergraduate and competition-level math problems
Grok 4 99.0%
Grok 4.3 N/A
MMLU-Pro
Expert knowledge across 14 academic disciplines
Grok 4 86.6%
Grok 4.3 N/A
SciCode
Scientific research coding and numerical methods
Grok 4 45.7%
Grok 4.3 N/A
SWE-bench Verified
Real GitHub issues requiring multi-file code fixes
Grok 4 69.1%
Grok 4.3 N/A
Community discussion

What Reddit discussions say about Grok 4 vs Grok 4.3

Grok 4 and Grok 4.3 are both surfacing live Reddit discussions, giving this comparison a community layer beyond specs and benchmarks.

The most visible threads right now are clustered in r/singularity, r/grok, r/LoveGrok. 4 threads are showing up in both models' discussion sets, which is useful for side-by-side evaluation.

Grok 4 r/singularity 3,741 upvotes 492 comments July 8, 2025
I’m not even excited for Grok 4 anymore

I'm not sure if the other post was real but this one sure is: https://gizmodo.com/round-them-up-grok-praises-hitler-as-elon-musks-ai-tool-goes-full-nazi-2000626156

Elon musk touted these changes beforehand as a "big upgrade." What a vile man and vile thing.

Open Reddit thread
Grok 4 r/singularity 1,283 upvotes 951 comments July 13, 2025
A conversation to be had about grok 4 that reflects on AI and the regulation around it

How is it allowed that a model that’s fundamentally f’d up can be released anyways??

System prompts are like a weak and bad bandage to try and cure a massive wound (bad analogy my fault but you get it).

I understand there were many delays so they couldn’t push the promised date any further but there has to be some type of regulation that forces them not to release models that are behaving like this because you didn’t care enough for the data you trained it on or didn’t manage to fix it in time, they should be forced not to release it in this state.

This isn’t just about this, we’ve seen research and alignment being increasingly difficult as you scale up, even openAI’s open source model is reported to be far worse than this (but they didn’t release it) so if you don’t have hard and strict regulations it’ll get worse..

Also want to thank the xAI team because they’ve been pretty transparent with this whole thing which I love honestly, this isn’t to shit on them its to address yes their issue and that they allowed this but also a deeper issue that could scale

Open Reddit thread
View more discussions →

Which model should you choose?

Use the summary below to decide which model better fits your workflow, budget, and feature requirements.

Best fit for

Grok 4

Grok 4 is a stronger fit for benchmark-led evaluation.

Best fit for

Grok 4.3

Grok 4.3 is a stronger fit for long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

Verdict

Choose Grok 4 if you prioritize benchmark-led evaluation. Choose Grok 4.3 if your workflow depends more on long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

FAQ

Common questions about Grok 4 vs Grok 4.3

What is the main difference between Grok 4 and Grok 4.3?

Grok 4 leans toward benchmark-led evaluation, while Grok 4.3 is better suited to long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

Which model is cheaper: Grok 4 or Grok 4.3?

Grok 4.3 starts lower on input pricing at $1.2500 per 1M input tokens, compared with $3.0000 for Grok 4.

Which model has the larger context window: Grok 4 or Grok 4.3?

Grok 4 is listed with a context window of 256,000, while Grok 4.3 is listed with 1M.

How should I evaluate Grok 4 vs Grok 4.3 for my use case?

This comparison currently includes 9 shared benchmark rows, helping you compare practical performance across overlapping evaluations.