token.app › Compare › Gemini 2.5 Flash vs Grok 4.5
Gemini 2.5 Flash vs Grok 4.5
Grok 4.5 leads on 1 of 1 shared benchmarks. Gemini 2.5 Flash is 3.5× cheaper per token on a blended 3:1 basis. Gemini 2.5 Flash accepts the larger context window (1.0M).
Head to head
Blended price uses a 3:1 input:output mix
| Gemini 2.5 Flash | Grok 4.5 | |
|---|---|---|
| Provider | xAI | |
| Input $/1M | $0.300 | $2.00 |
| Output $/1M | $2.50 | $6.00 |
| Blended $/1M | $0.850 | $3.00 |
| Context window | 1.0M | 500K |
| Max output | 66K | — |
| Released | Jun 2025 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| OTIS Mock AIME | 70.8% | 97.8% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose Gemini 2.5 Flash if…
- Costs less per token — $0.850 vs $3.00 blended
- Larger context window (1.0M)
Choose Grok 4.5 if…
- Higher OTIS Mock AIME (97.8% vs 70.8%)
- Newer model (released Jul 2026)
FAQ
Which is better, Gemini 2.5 Flash or Grok 4.5?
Across the 1 benchmark both models have independently-run scores for, Gemini 2.5 Flash leads on 0 and Grok 4.5 leads on 1. Benchmarks are one input — price and context window are on this page too.
Is Gemini 2.5 Flash cheaper than Grok 4.5?
Gemini 2.5 Flash is cheaper: $0.850 versus $3.00 per million tokens blended at 3:1 input:output. Input alone: $0.300 vs $2.00. Output alone: $2.50 vs $6.00.
What context windows do Gemini 2.5 Flash and Grok 4.5 have?
Gemini 2.5 Flash: 1,048,576 tokens. Grok 4.5: 500,000 tokens.
Who makes Gemini 2.5 Flash and Grok 4.5?
Gemini 2.5 Flash is made by Google. Grok 4.5 is made by xAI.
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