GPT-6 Astra vs Grok Code Fast 1
GPT-6 Astra leads the LLM Stats Score 59.6 to 20.7. Grok Code Fast 1 is 38.1x cheaper per token.
OpenAI · xAI · Updated for 2026
Which is better?
GPT-6 Astra leads the overall LLM Stats Score 59.6 to 20.7, ranking #1 overall.
On price, Grok Code Fast 1 is roughly 38.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-6 Astra also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-6 Astra
- overall performance matters — it scores 59.6 and ranks #1 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you process long inputs — it offers a 1,050,000 token context window
- you want the most recent training data — it shipped Sep 2026
Choose Grok Code Fast 1
- cost matters — it's about 38.1x cheaper per token
At a glance
The differences that matter most.
Individual benchmarks
22 reported for GPT-6 Astra · 1 for Grok Code Fast 1
GPT-6 Astra and Grok Code Fast 1don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-6 Astra ($10.00/1M tokens) is 50.0x more expensive than Grok Code Fast 1 ($0.20/1M tokens).
For output processing, GPT-6 Astra ($50.00/1M tokens) is 33.3x more expensive than Grok Code Fast 1 ($1.50/1M tokens).
In conclusion, GPT-6 Astra is more expensive than Grok Code Fast 1.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-6 Astra accepts 1,050,000 input tokens compared to Grok Code Fast 1's 256,000 tokens. GPT-6 Astra can generate longer responses up to 128,000 tokens, while Grok Code Fast 1 is limited to 10,000 tokens.
Input capabilities
Documented input modalities across available providers
GPT-6 Astra supports multimodal inputs, whereas Grok Code Fast 1 does not.
GPT-6 Astra can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-6 Astra
Grok Code Fast 1
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
GPT-6 Astra was released on 2026-09-04, while Grok Code Fast 1 was released on 2025-08-28.
GPT-6 Astra is 12 months newer than Grok Code Fast 1.
Sep 4, 2026
2 weeks ago
1.0yr newerAug 28, 2025
1.1 years ago
Knowledge Cutoff
When training data ends
GPT-6 Astra has a documented knowledge cutoff of 2026-04-30, while Grok Code Fast 1's cutoff date is not specified.
We can confirm GPT-6 Astra's training data extends to 2026-04-30, but cannot make a direct comparison without Grok Code Fast 1's cutoff date.
Apr 2026
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Provider Availability
GPT-6 Astra is available from OpenAI. Grok Code Fast 1 is available from xAI.
GPT-6 Astra
Grok Code Fast 1
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-6 Astra and Grok Code Fast 1 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-6 Astra vs Grok Code Fast 1.