Gemini 3 Flash vs Grok 4.5: Specs & Benchmark Comparison
Gemini 3 Flash is developed by Google, while Grok 4.5 comes from xAI. Gemini 3 Flash was released in December 2025, and Grok 4.5 followed 7 months later in July 2026.
We have 23 benchmark results for Gemini 3 Flash and 15 benchmark results for Grok 4.5, but they overlap on a single test: GPQA, where Grok 4.5 scores 93.0% against 90.0%.
Gemini 3 Flash is the cheaper API at $0.50 per million input tokens and $3 per million output tokens, roughly 4 times cheaper than Grok 4.5 at $2 and $6. Gemini 3 Flash takes the larger context window at 1M tokens, compared with 500K for Grok 4.5. Gemini 3 Flash accepts text, images, audio, and video as input, while Grok 4.5 accepts text and images.
| Characteristic | Gemini 3 Flash | Grok 4.5 |
|---|---|---|
| Company | xAI | |
| Release Date | December 16, 2025 | July 16, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 500K |
| Context (output) | 66K | — |
| Input Price / 1M | $0.50 | $2.00 |
| Output Price / 1M | $3.00 | $6.00 |
| Average Score | 63.0% | 52.9% |
| Benchmarks | ||
| GPQA | 90.0% | 93.0% |
Visual Benchmark Comparison
Verdict
Gemini 3 Flash leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Gemini 3 Flash — 0.6, Grok 4.5 — 0.5.
Gemini 3 Flash is 2.3x cheaper: input $0.50/1M vs $2.00/1M tokens.
Gemini 3 Flash supports a larger context: 1M vs 500K tokens.
Grok 4.5 is newer: released 7/16/2026 vs 12/16/2025.
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Frequently Asked Questions
Which is better for coding — Gemini 3 Flash or Grok 4.5?
Which model is cheaper — Gemini 3 Flash or Grok 4.5?
Which has a larger context window — Gemini 3 Flash or Grok 4.5?
The Gemini 3 Flash 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 Gemini 3 Flash or Grok 4.5 page. See also the complete list of AI model comparisons.