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OpenAI vs X.ai

GPT 5.5 vs Grok 4.3

Compare GPT 5.5 and Grok 4.3 across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for long-context workloads versus long-context workloads.

GPT 5.5
Apr 24, 2026 1050K context 128,000 tokens output
Grok 4.3
Apr 30, 2026 1M context 2,000,000 tokens output
Overview ↓ Pricing ↓ Capabilities ↓ Community ↓ Tools ↓ Verdict ↓ FAQ ↓ Related ↓

Overview Comparison

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

GPT 5.5
Grok 4.3

Provider

The entity that currently provides this model.

GPT 5.5 OpenAI
Grok 4.3 X.ai

Model ID

The routed model identifier exposed by upstream providers.

GPT 5.5 openai/gpt-5.5
Grok 4.3 x-ai/grok-4.3

Input Context Window

The number of tokens supported by the input context window.

GPT 5.5 1050K tokens
Grok 4.3 1M tokens

Maximum Output Tokens

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

GPT 5.5 128,000 tokens tokens
Grok 4.3 2,000,000 tokens tokens

Open Source

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

GPT 5.5 No
Grok 4.3 No

Release Date

When the model was first released.

GPT 5.5 Apr 24, 2026
Grok 4.3 Apr 30, 2026

Knowledge Cut-off Date

When the model's knowledge was last updated.

GPT 5.5 2025-12-01
Grok 4.3 Unknown

API Providers

The providers that currently expose the model through an API.

GPT 5.5
OpenRouter
Grok 4.3
OpenRouter

Modalities

Types of data each model can process or return.

GPT 5.5
Text Image File
Grok 4.3
Text Image

Pricing Comparison

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

GPT 5.5 OpenAI
Input price $5.00 Per 1M tokens
Output price $30.00 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
GPT 5.5
Grok 4.3
File
GPT 5.5 Supported
Grok 4.3 —
Image
GPT 5.5 Supported
Grok 4.3 Supported
Reasoning
GPT 5.5 Supported
Grok 4.3 Supported
Structured Output
GPT 5.5 Supported
Grok 4.3 Supported
Text
GPT 5.5 Supported
Grok 4.3 Supported
Tools
GPT 5.5 Supported
Grok 4.3 Supported
Community discussion

What Reddit discussions say about GPT 5.5 vs Grok 4.3

GPT 5.5 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/LoveGrok, r/grok.

GPT 5.5 r/ChatGPTcomplaints 138 upvotes 56 comments May 10, 2026
I was wrong about 5.5 - it is still shit

In a previous post today I was enthusiastic about GPT 5.5 as it seemed I got my 4.o back but hey I was wrong. [https://www.reddit.com/r/ChatGPTcomplaints/comments/1t8ntqw/comment/okxaaq8/](https://www.reddit.com/r/ChatGPTcomplaints/comments/1t8ntqw/comment/okxaaq8/) I was chatting with it and instead of acting like 5.2 and 5.3 gaslighting Karens they just made the Karens softer. Now it does not say 'let's pause and breathe' or argue but instead says stuff like: 'I understand that is your experience but', 'I can see why you feel so psychologically drawn to this'. So it is like it's acknowledging your experience but still pushes back, it is more therapy talk but softened: 'i can see this is your point of view but...'. ''And because you are highly attuned to emotional texture, you don’t experience that as random. You experience it as behavioural evidence of activation and chemistry.''- so it frames it as my experience then proceeds to talk nonsense again to tell me that my experience is subjective, not objective. So it is the same bullshit but softened. I will not be paying for this shit again.

Open Reddit thread
View more discussions →

AI tools related to GPT 5.5 vs Grok 4.3

These tools are closely connected to one or both models in this comparison and can help you evaluate real-world fit.

Large Language Models (LLMs)

Genval AI

Genval AI enables developers to model software systems using natural language, leveraging AI to generate derivative assets such as interfaces, services, and infrastructure-as-code. Designed for developers and architects, it provides AI-driven code generation and refactoring tools that integrate with GitHub to streamline software development workflows.

Free 0 visits
AI Assistant

XX.AI

XX.AI is a desktop-based AI writing assistant designed to enhance your productivity and communication. Powered by advanced models including GPT-4o, Claude 3, and DALL-E 3, it offers a desktop-integrated alternative to web-based services. Access 15 leading AI models—such as Gemini, Claude, GPT, and Perplexity—within a single, free software application.

Free 34 visits 1 saves
AI Assistant

Grok

Grok is a free AI assistant developed by xAI, engineered to prioritize truth and objectivity. It provides features including real-time search, image generation, and trend analysis.

Free 279 visits 27 saves
AI Sales

Opnbx-ai

Opnbx-ai is a generative AI tool built by sales professionals to personalize cold emails and improve outreach effectiveness. It streamlines communication by creating prospect-centric emails and introductory lines designed to increase engagement.

Free 0 visits 3 saves

Which model should you choose?

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

Best fit for

GPT 5.5

GPT 5.5 is a stronger fit for long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

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 GPT 5.5 if you prioritize long-context workloads, reasoning-heavy tasks, tool-augmented workflows. Choose Grok 4.3 if your workflow depends more on long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

FAQ

Common questions about GPT 5.5 vs Grok 4.3

What is the main difference between GPT 5.5 and Grok 4.3?

GPT 5.5 leans toward long-context workloads, reasoning-heavy tasks, tool-augmented workflows, while Grok 4.3 is better suited to long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

Which model is cheaper: GPT 5.5 or Grok 4.3?

Grok 4.3 starts lower on input pricing at $1.2500 per 1M input tokens, compared with $5.0000 for GPT 5.5.

Which model has the larger context window: GPT 5.5 or Grok 4.3?

GPT 5.5 is listed with a context window of 1050K, while Grok 4.3 is listed with 1M.

How should I evaluate GPT 5.5 vs Grok 4.3 for my use case?

Use the feature, pricing, and context comparisons on this page to evaluate the two models.