Apr 24, 2026
1050K context
128,000 tokens output
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.
Apr 30, 2026
1M context
2,000,000 tokens output
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.
Shares his thoughts on ai
[https://youtu.be/Qct36RA3y9k?t=1842](https://youtu.be/Qct36RA3y9k?t=1842)
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.
More info: [https://github.com/lechmazur/nyt-connections/](https://github.com/lechmazur/nyt-connections/)
Which model should you choose?
Use the summary below to decide which model better fits your workflow, budget, and feature requirements.
GPT 5.5
GPT 5.5 is a stronger fit for long-context workloads, reasoning-heavy tasks, tool-augmented workflows.
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.