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Model comparison
GPT-6 Astra vs Grok 4.6
Compare GPT-6 Astra and Grok 4.6 using the same provider-sourced text & reasoning rubric. No mystery score and no invented benchmark ranking.
Facts checked September 4, 2026
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Example: 6,000 input tokens for 10 pages, plus a 500-token summary. Page lengths vary; adjust the numbers below.
One run sends your input to the model once and receives an answer. Tokens are pieces of text: input is what you send, output is the answer you receive.
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How this estimate works
Estimates exclude taxes, tools, cache storage/writes, free allowances and custom discounts. Image estimates cover output only, not prompt or reference-image charges. Quality modes differ by model. Unlisted settings are not treated as free.
| Model | Access | Estimated total (USD) |
|---|---|---|
| GPT-6 AstraOpenAI | OpenAI | $0.085 |
| Grok 4.6SpaceXAI | SpaceXAI | No reviewed rate |
Quick take
GPT-6 Astra
OpenAI's most capable model for difficult end-to-end work, combining frontier reasoning with a million-token context window and a broad set of agent tools.
Best for
- Complex, long-running agent workflows
- Repository-scale coding and computer use
- Research and document creation with several tools
Watch out for
Access is still rolling out, fine-tuning is not supported, and requests above 272K input tokens use higher rates across the full request. Confirm access and measure total task cost before standardizing on Astra.
Grok 4.6
SpaceXAI's frontier text-and-image model for coding, agentic tasks, and knowledge work, with direct web, X, and code tools.
Best for
- Coding agents with live web or X context
- Tool-heavy knowledge workflows
- Teams already building on OpenAI-compatible APIs
Watch out for
Published regions are narrower than a generic 'global' label, and the base token rate doubles for long-context requests.
Compare the published facts
GPT-6 Astra vs Grok 4.6
Values use each provider's own published units and limits. A blank means the provider did not publish a directly comparable value in the sources reviewed.
| Text & reasoning | GPT-6 Astra | Grok 4.6 |
|---|---|---|
| Context windowMaximum combined prompt and working context documented by the provider. | 1.05M tokens | 500K tokens |
| Maximum outputProvider-published response limit, where available. | 128K tokens | No published text cap |
| Knowledge cutoffLatest reliable knowledge date explicitly published by the model provider. Search and connected tools can retrieve newer information but do not change the model's built-in cutoff. | April 30, 2026 | January 2026 |
| Input priceCurrent standard list price per million input tokens unless noted. | $10 / 1M | $2 / 1M |
| Output priceCurrent standard list price per million output tokens unless noted. | $50 / 1M | $6 / 1M |
| InputsMedia types accepted by the listed model endpoint. | Text, image | Text, image |
| Tools & agentsSelected native tools and agent-building capabilities, not an exhaustive list. | Functions, search, code, computer, image, MCP | Functions, web/X search, code execution |
How to choose
Compare the job, not the hype.
Start with the job you need to complete, then validate cost, access, and policy details on your exact provider route.
GPT-6 Astra
OpenAI says API content is not used for model training by default. Standard abuse-monitoring logs may be retained for up to 30 days, with additional controls available to qualifying organizations.
Provider and API links
Grok 4.6
SpaceXAI says API inputs and outputs are never used for training without explicit permission. Requests are encrypted and retained for 30 days by default; team-level zero data retention is available with feature tradeoffs.
Provider and API links
Frequently asked questions
GPT-6 Astra vs Grok 4.6 FAQ
What is the main difference between GPT-6 Astra and Grok 4.6?
GPT-6 Astra: OpenAI's most capable model for difficult end-to-end work, combining frontier reasoning with a million-token context window and a broad set of agent tools. Grok 4.6: SpaceXAI's frontier text-and-image model for coding, agentic tasks, and knowledge work, with direct web, X, and code tools.
Should I choose GPT-6 Astra or Grok 4.6?
Consider GPT-6 Astra when your priority is Complex, long-running agent workflows. Consider Grok 4.6 when your priority is Coding agents with live web or X context. Test both with your own data and provider route before committing.
Is this GPT-6 Astra vs Grok 4.6 comparison based on Cody benchmarks?
No. This comparison aligns provider-published facts for the Text & reasoning category. It does not claim a universal winner or combine incompatible third-party benchmark scores.