High-volume, cost-sensitive work
Choose Grok 4.5
Grok 4.5 costs 11% less on a typical mix of three input tokens for every output token ($3.00 against $3.38 per million tokens).
Gemini Omni Flash vs Grok 4.5: price, context and capabilities
Choose Gemini Omni Flash for very long inputs and the latest release. Choose Grok 4.5 for high-volume, cost-sensitive work and writing and code generation.
In short
- Grok 4.5 is 11% cheaper than Gemini Omni Flash at the headline price ($3.00 / 1M tokens vs $3.38 / 1M tokens).
- Gemini Omni Flash reads more per request: 1.05M tokens against 500k.
- Gemini Omni Flash is the newer model (August 2026, against July 2026).
- Only Gemini Omni Flash offers audio input, video input.
- Only Grok 4.5 offers prompt caching.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose Grok 4.5
Grok 4.5 charges $6.00 per million output tokens, against $9.00 for Gemini Omni Flash. Output dominates the bill when answers are long.
Very long inputs
Choose Gemini Omni Flash
Gemini Omni Flash reads up to 1.05M tokens per request, against 500k for Grok 4.5.
Latest release
Choose Gemini Omni Flash
Gemini Omni Flash is the newer release (August 2026, against July 2026 for Grok 4.5).
Monthly cost at three volumes
| Volume | Gemini Omni Flash | Grok 4.5 | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $3.75 | $3.50 | Grok 4.5, $0.25 less |
| Production: 20M input, 5M output tokens | $75.00 | $70.00 | Grok 4.5, $5.00 less |
| Scale: 500M input, 100M output tokens | $1,650 | $1,600 | Grok 4.5, $50.00 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| Gemini Omni Flash | Grok 4.5 | |
|---|---|---|
| Provider | xAI | |
| Category | Language models | Language models |
| Status | Generally available | Legacy |
| Headline price | $3.38 / 1M tokens | $3.00 / 1M tokens |
| Input | $1.50 / 1M tokens | $2.00 / 1M tokens |
| Output | $9.00 / 1M tokens | $6.00 / 1M tokens |
| Cached input | No data | $0.30 / 1M tokens |
| Context window | 1.05M | 500k |
| Max output | No data | No data |
| Released | August 2026 | July 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Audio input, Video input, Reasoning, Tool calling, Structured output, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | gemini-omni-1.1-flash | grok-4.5 |
Benchmarks side by side
Leader in bold.
| Benchmark | Gemini Omni Flash | Grok 4.5 |
|---|---|---|
| Intelligence Index | No data | 38.8 |
| SciCode | No data | 55% |
| GPQA Diamond | No data | 93.1% |
| Humanity's Last Exam | No data | 42.7% |
| MMMU-Pro (visual reasoning) | No data | 80.4% |
| Long-context reasoning (AA-LCR) | No data | 79.3% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Gemini Omni Flash or Grok 4.5?
Choose Gemini Omni Flash for very long inputs and the latest release. Choose Grok 4.5 for high-volume, cost-sensitive work and writing and code generation.
Which is cheaper, Gemini Omni Flash or Grok 4.5?
Grok 4.5 is 11% cheaper than Gemini Omni Flash at the headline price ($3.00 / 1M tokens vs $3.38 / 1M tokens).
Which has the larger context window, Gemini Omni Flash or Grok 4.5?
Gemini Omni Flash reads more per request: 1.05M tokens against 500k.
What is the difference between Gemini Omni Flash and Grok 4.5?
Gemini Omni Flash is made by Google and Grok 4.5 by xAI. Grok 4.5 is 11% cheaper than Gemini Omni Flash at the headline price ($3.00 / 1M tokens vs $3.38 / 1M tokens). Gemini Omni Flash reads more per request: 1.05M tokens against 500k. Gemini Omni Flash is the newer model (August 2026, against July 2026). Only Gemini Omni Flash offers audio input, video input. Only Grok 4.5 offers prompt caching.
How much do Gemini Omni Flash and Grok 4.5 cost per month?
At 20 million input and 5 million output tokens a month, Gemini Omni Flash costs $75.00 and Grok 4.5 costs $70.00, at standard rates.
Which is newer, Gemini Omni Flash or Grok 4.5?
Gemini Omni Flash was released on August 2026 and Grok 4.5 on July 2026.