High-volume, cost-sensitive work
Choose Gemini 2.5 Flash
Gemini 2.5 Flash costs 32% less on a typical mix of three input tokens for every output token ($0.85 against $1.25 per million tokens).
Gemini 2.5 Flash vs Grok Build 0.1: price, context and capabilities
Choose Gemini 2.5 Flash for high-volume, cost-sensitive work, reused prompts and documents (RAG, agents) and very long inputs. Choose Grok Build 0.1 for writing and code generation and the latest release.
In short
- Gemini 2.5 Flash is 32% cheaper than Grok Build 0.1 at the headline price ($0.85 / 1M tokens vs $1.25 / 1M tokens).
- Gemini 2.5 Flash reads more per request: 1.05M tokens against 256k.
- Grok Build 0.1 is the newer model (May 2026, against June 2025).
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose Grok Build 0.1
Grok Build 0.1 charges $2.00 per million output tokens, against $2.50 for Gemini 2.5 Flash. Output dominates the bill when answers are long.
Reused prompts and documents (RAG, agents)
Choose Gemini 2.5 Flash
Gemini 2.5 Flash charges $0.03 per million cached input tokens, against $0.20 for Grok Build 0.1.
Very long inputs
Choose Gemini 2.5 Flash
Gemini 2.5 Flash reads up to 1.05M tokens per request, against 256k for Grok Build 0.1.
Latest release
Choose Grok Build 0.1
Grok Build 0.1 is the newer release (May 2026, against June 2025 for Gemini 2.5 Flash).
Monthly cost at three volumes
| Volume | Gemini 2.5 Flash | Grok Build 0.1 | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $0.93 | $1.50 | Gemini 2.5 Flash, $0.58 less |
| Production: 20M input, 5M output tokens | $18.50 | $30.00 | Gemini 2.5 Flash, $11.50 less |
| Scale: 500M input, 100M output tokens | $400.00 | $700.00 | Gemini 2.5 Flash, $300.00 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| Gemini 2.5 Flash | Grok Build 0.1 | |
|---|---|---|
| Provider | xAI | |
| Category | Language models | Language models |
| Status | Legacy | Generally available |
| Headline price | $0.85 / 1M tokens | $1.25 / 1M tokens |
| Input | $0.30 / 1M tokens | $1.00 / 1M tokens |
| Output | $2.50 / 1M tokens | $2.00 / 1M tokens |
| Cached input | $0.03 / 1M tokens | $0.20 / 1M tokens |
| Context window | 1.05M | 256k |
| Max output | 66k | No data |
| Released | June 2025 | May 2026 |
| Knowledge cutoff | January 2025 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | gemini-2.5-flash | grok-build-0.1 |
Benchmarks side by side
Leader in bold.
| Benchmark | Gemini 2.5 Flash | Grok Build 0.1 |
|---|---|---|
| Terminal-Bench Hard | 12.1% | No data |
| GPQA Diamond | 68.3% | No data |
| Humanity's Last Exam | 4.7% | No data |
| IFBench (instruction following) | 39% | No data |
| τ²-Bench (agentic tool use) | 14.9% | No data |
| MMMU-Pro (visual reasoning) | 65.5% | No data |
| Long-context reasoning (AA-LCR) | 49.9% | No data |
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 2.5 Flash or Grok Build 0.1?
Choose Gemini 2.5 Flash for high-volume, cost-sensitive work, reused prompts and documents (RAG, agents) and very long inputs. Choose Grok Build 0.1 for writing and code generation and the latest release.
Which is cheaper, Gemini 2.5 Flash or Grok Build 0.1?
Gemini 2.5 Flash is 32% cheaper than Grok Build 0.1 at the headline price ($0.85 / 1M tokens vs $1.25 / 1M tokens).
Which has the larger context window, Gemini 2.5 Flash or Grok Build 0.1?
Gemini 2.5 Flash reads more per request: 1.05M tokens against 256k.
What is the difference between Gemini 2.5 Flash and Grok Build 0.1?
Gemini 2.5 Flash is made by Google and Grok Build 0.1 by xAI. Gemini 2.5 Flash is 32% cheaper than Grok Build 0.1 at the headline price ($0.85 / 1M tokens vs $1.25 / 1M tokens). Gemini 2.5 Flash reads more per request: 1.05M tokens against 256k. Grok Build 0.1 is the newer model (May 2026, against June 2025).
How much do Gemini 2.5 Flash and Grok Build 0.1 cost per month?
At 20 million input and 5 million output tokens a month, Gemini 2.5 Flash costs $18.50 and Grok Build 0.1 costs $30.00, at standard rates.
Which is newer, Gemini 2.5 Flash or Grok Build 0.1?
Grok Build 0.1 was released on May 2026 and Gemini 2.5 Flash on June 2025.