Grok or GPT-6 Luna?
Choose Grok when coding, agent workflows, real-time web/x context and productivity integrations is the closer match. Choose GPT-6 Luna when high-volume classification, real-time canvas editing and lightweight agents matters more. Test both on the same real tasks before moving a production workflow.
Coding, agent workflows, real-time web/X context and productivity integrations
High-volume classification, real-time Canvas editing and lightweight agents
Grok
Coding, agent workflows, real-time web/X context and productivity integrations
Official specification ↗GPT-6 Luna
OpenAI's lightweight, low-cost reasoning model for high-frequency agent actions.
Official specification ↗Side-by-side comparison
| Category | Grok | GPT-6 Luna |
|---|---|---|
| Provider | SpaceXAI | OpenAI |
| Type | Product · General Assistant | Model · Reasoning model |
| Pricing summary | Free and paid access varies by product/plan; API pricing is model-specific | $0.15 input, $0.015 cached input and $0.90 output per 1M tokens |
| Input price | Product or plan pricing | $0.15 / 1M tokens |
| Cached input | Not directly comparable | $0.015 / 1M tokens |
| Output price | Product or plan pricing | $0.90 / 1M tokens |
| Context window | Varies by included model and plan | 1.05M tokens |
| Maximum output | Varies by included model and surface | 128K tokens |
| Knowledge cutoff | Model-dependent; web access may add current information | August 2026 |
| Reasoning | Varies by selected model or mode | none, low, medium, high |
| Relative speed | Varies by model, plan and workload | Ultra fast |
| Input modalities | See documented product features | Text and image |
| Output modalities | See documented product features | Text |
| Tools and integrations | Grok 4.6 for long-running agent tasks; Real-time web and X research tools; Grok Build and Agent Tools API; Grok Imagine image and video creation | Functions, web search, file search, computer use and supported Responses API tools |
| API / access | Product surface; see official source for API availability | v1/responses, v1/chat/completions and v1/batch |
| Best fit | Coding, agent workflows, real-time web/X context and productivity integrations | High-volume classification, real-time Canvas editing and lightweight agents |
| Company | SpaceXAI | OpenAI |
| Product category | Product · General Assistant | Model · Reasoning model |
| Current pricing note | Free and paid access varies by product/plan; API pricing is model-specific | $0.15 input, $0.015 cached input and $0.90 output per 1M tokens |
| Best suited to | Coding, agent workflows, real-time web/X context and productivity integrations | High-volume classification, real-time Canvas editing and lightweight agents |
| Key capabilities | Grok 4.6 for long-running agent tasks; Real-time web and X research tools; Grok Build and Agent Tools API; Grok Imagine image and video creation | 1.05M context; 128K maximum output; Fast token throughput; Real-time canvas integration |
| Last verified | 2026-08-24 | 2026-11-02 |
| Official product source | https://x.ai/news/grok-4-6 | https://developers.openai.com/api/docs/models/gpt-6-luna |
How we reached this verdict
We looked at the things that affect everyday use: what each product can do, how its plans are structured, where it fits into your existing workflow, and what the provider currently documents. Benchmark results are useful context, but they are not a universal winner score because test settings and tools vary.
Common questions
Grok or GPT-6 Luna: which should I choose?
Choose Grok for coding, agent workflows, real-time web/x context and productivity integrations. Choose GPT-6 Luna for high-volume classification, real-time canvas editing and lightweight agents. Validate the decision with your own prompts and total task cost.
Is Grok cheaper than GPT-6 Luna?
Pricing units can differ. Grok: Free and paid access varies by product/plan; API pricing is model-specific. GPT-6 Luna: $0.15 input, $0.015 cached input and $0.90 output per 1M tokens. Check tool charges, plan limits, caching and long-context rules before comparing totals.
Which is better for coding and agent work?
Capability depends on the selected product surface, tools and harness. Grok is positioned for coding, agent workflows, real-time web/x context and productivity integrations; GPT-6 Luna is positioned for high-volume classification, real-time canvas editing and lightweight agents. Run the same repository task on both.
How do their context windows compare?
Grok lists Varies by included model and plan; GPT-6 Luna lists 1.05M tokens. A larger limit does not by itself guarantee better retrieval or lower cost.
Official sources
Use these provider pages to confirm current features, pricing and availability.
AI tools change quickly. We checked this page on 2026-09-08. Before you subscribe, confirm the latest price, regional availability and usage limits on the provider website.