GPT-6 Astra vs Grok 4.5: Specs & Benchmark Comparison
| Characteristic | GPT-6 Astra | Grok 4.5 |
|---|---|---|
| Company | OpenAI | xAI |
| Release Date | September 3, 2026 | July 16, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.1M | 500K |
| Context (output) | 128K | — |
| Input Price / 1M | $10.00 | $2.00 |
| Output Price / 1M | $50.00 | $6.00 |
| Average Score | 0.7 | 0.8 |
| Benchmarks | ||
| GPQA Diamond | 1.0 | 0.9 |
Visual Benchmark Comparison
GPT-6 Astra
Grok 4.5
GPQA Diamond1.0 vs 0.9
1.0
0.9
Verdict
GPT-6 Astra leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-6 Astra — 0.7, Grok 4.5 — 0.8.
API Cost
Grok 4.5 is 7.5x cheaper: input $2.00/1M vs $10.00/1M tokens.
Context Window
GPT-6 Astra supports a larger context: 1M vs 500K tokens.
Recency
GPT-6 Astra is newer: released 9/3/2026 vs 7/16/2026.
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Frequently Asked Questions
Which is better for coding — GPT-6 Astra or Grok 4.5?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-6 Astra or Grok 4.5?
Grok 4.5 is cheaper for input: $2.00 per 1M tokens vs $10.00.
Which has a larger context window — GPT-6 Astra or Grok 4.5?
GPT-6 Astra supports a larger context: 1,050,000 tokens vs 500,000.
The GPT-6 Astra and Grok 4.5 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 4.5 page. See also the complete list of AI model comparisons.