Grok-3 vs Grok 4.5: Specs & Benchmark Comparison
Grok-3 and Grok 4.5 both come from xAI, Grok-3 was released in February 2025, and Grok 4.5 followed 17 months later in July 2026.
We have 5 benchmark results for Grok-3 and 15 benchmark results for Grok 4.5, but they overlap on a single test: GPQA, where Grok 4.5 scores 93.0% against 85.0%.
Grok 4.5 is the cheaper API at $2 per million input tokens and $6 per million output tokens, about 50% below Grok-3 at $3 and $15. Grok 4.5 takes the larger context window at 500K tokens, compared with 128K for Grok-3. Both accept text and images as input.
| Characteristic | Grok-3 | Grok 4.5 |
|---|---|---|
| Company | xAI | xAI |
| Release Date | February 16, 2025 | July 16, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 128K | 500K |
| Context (output) | 8K | — |
| Input Price / 1M | $3.00 | $2.00 |
| Output Price / 1M | $15.00 | $6.00 |
| Average Score | 85.7% | 52.9% |
| Benchmarks | ||
| GPQA | 85.0% | 93.0% |
Visual Benchmark Comparison
Verdict
Grok 4.5 leads in 3 out of 4 comparison categories.
Both models show comparable average scores: Grok-3 — 0.9, Grok 4.5 — 0.5.
Grok 4.5 is 2.3x cheaper: input $2.00/1M vs $3.00/1M tokens.
Grok 4.5 supports a larger context: 500K vs 128K tokens.
Grok 4.5 is newer: released 7/16/2026 vs 2/16/2025.
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Frequently Asked Questions
Which is better for coding — Grok-3 or Grok 4.5?
Which model is cheaper — Grok-3 or Grok 4.5?
Which has a larger context window — Grok-3 or Grok 4.5?
The Grok-3 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 Grok-3 or Grok 4.5 page. See also the complete list of AI model comparisons.