GPT-6 Astra vs Grok-3 Mini: Specs & Benchmark Comparison
GPT-6 Astra is developed by OpenAI, while Grok-3 Mini comes from xAI. Grok-3 Mini was released in February 2025, and GPT-6 Astra followed 19 months later in September 2026.
We have 22 benchmark results for GPT-6 Astra and 4 benchmark results for Grok-3 Mini, but they overlap on a single test: GPQA Diamond, where GPT-6 Astra scores 96.0% against 84.0%.
Grok-3 Mini is the cheaper API at $0.30 per million input tokens and $0.50 per million output tokens, roughly 33 times cheaper than GPT-6 Astra at $10 and $50. GPT-6 Astra takes the larger context window at 1M tokens, compared with 128K for Grok-3 Mini. Both accept text and images as input.
| Characteristic | GPT-6 Astra | Grok-3 Mini |
|---|---|---|
| Company | OpenAI | xAI |
| Release Date | September 4, 2026 | February 16, 2025 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.1M | 128K |
| Context (output) | 128K | 8K |
| Input Price / 1M | $10.00 | $0.30 |
| Output Price / 1M | $50.00 | $0.50 |
| Average Score | 74.4% | 87.8% |
| Benchmarks | ||
| GPQA Diamond | 96.0% | 84.0% |
Visual Benchmark Comparison
Verdict
GPT-6 Astra leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GPT-6 Astra — 0.7, Grok-3 Mini — 0.9.
Grok-3 Mini is 75.0x cheaper: input $0.30/1M vs $10.00/1M tokens.
GPT-6 Astra supports a larger context: 1M vs 128K tokens.
GPT-6 Astra is newer: released 9/4/2026 vs 2/16/2025.
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Frequently Asked Questions
Which is better for coding — GPT-6 Astra or Grok-3 Mini?
Which model is cheaper — GPT-6 Astra or Grok-3 Mini?
Which has a larger context window — GPT-6 Astra or Grok-3 Mini?
The GPT-6 Astra and Grok-3 Mini comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-6 Astra or Grok-3 Mini page. See also the complete list of AI model comparisons.