Model comparison - Similar price, same tier
Gemini 3.8 Flash vs Grok Build 0.1
Gemini 3.8 Flash is from Google and Grok Build 0.1 is from xAI. On list price, Gemini 3.8 Flash charges 25% less than Grok Build 0.1 for input ($0.75 vs $1 per 1M tokens), and Gemini 3.8 Flash charges 1.9x Grok Build 0.1's output price ($3.75 vs $2 per 1M tokens). Gemini 3.8 Flash has a 1,048,576-token context window and Grok Build 0.1 256,000 tokens; Gemini 3.8 Flash returns up to 65,536 output tokens per response, and no primary source states a max output for Grok Build 0.1. Gemini 3.8 Flash was released on September 2, 2026 and Grok Build 0.1 on May 19, 2026. Both are closed-weights models, available only through an API.
Last verified from each provider's pricing page. All sources
Side-by-side specs
| Spec | Gemini 3.8 Flash | Grok Build 0.1 |
|---|---|---|
| Provider | xAI | |
| Input / 1M tokens | $0.75 | $1 |
| Output / 1M tokens | $3.75 | $2 |
| Cache read / 1M | $0.075 | $0.20 |
| Batch input / 1M | $0.375 | - |
| Batch output / 1M | $1.875 | - |
| Long-context rates above | - | 200,000 tokens |
| Context window | 1,048,576 | 256,000 |
| Max output | 65,536 | - |
| Release date | ||
| Weights | Closed | Closed |
| API model id | gemini-3.8-flash | grok-build-0.1 |
| AI Gateway id | google/gemini-3.8-flash | spacexai/grok-build-0.1 |
| Last verified |
Prices in USD per 1M tokens at each provider's standard first-party rate. A dash means the provider does not bill that item separately or no primary page states it.
What each costs in practice
The same three workloads every model page uses, worked from each model's standard list rates. Swap in your own token counts with the math on each model's page.
| Workload | Gemini 3.8 Flash | Grok Build 0.1 |
|---|---|---|
| One agent session1M input tokens and 100K output tokens, no caching. | $1.13 | $1.20 |
| A chat app10,000 requests a day at 2K input and 500 output tokens each. | $33.75$1,012.50 per 30-day month | $30.00$900.00 per 30-day month |
| The same session at a 90% cache hit90% of the input is read from the prompt cache. The one-time cache write premium is not included. | $0.5175 | $0.48 |
Show the math
Gemini 3.8 Flash
- One agent sessionInput: 1M x $0.75 = $0.75Output: 0.1M x $3.75 = $0.375
- A chat appInput: 20M x $0.75 = $15.00Output: 5M x $3.75 = $18.75
- The same session at a 90% cache hitCached input: 0.9M x $0.075 = $0.0675Uncached input: 0.1M x $0.75 = $0.075Output: 0.1M x $3.75 = $0.375
Grok Build 0.1
- One agent sessionInput: 1M x $1 = $1.00Output: 0.1M x $2 = $0.20
- A chat appInput: 20M x $1 = $20.00Output: 5M x $2 = $10.00
- The same session at a 90% cache hitCached input: 0.9M x $0.20 = $0.18Uncached input: 0.1M x $1 = $0.10Output: 0.1M x $2 = $0.20
Benchmarks under the same setting
No board in the benchmark directory lists both Gemini 3.8 Flash and Grok Build 0.1 under the same setting, so there is no like-for-like score to show here.
Set them up in your tools
Step-by-step guides whose official docs list Gemini 3.8 Flash or Grok Build 0.1 by model id.
- Use Gemini in ClineLists Gemini 3.8 Flash
- Use Gemini in ContinueLists Gemini 3.8 Flash
- Use Gemini in CursorLists Gemini 3.8 Flash
- Use Gemini in GooseLists Gemini 3.8 Flash
- Use Gemini in Kilo CodeLists Gemini 3.8 Flash
- Use Gemini in OpenCodeLists Gemini 3.8 Flash
- Use Gemini in ZedLists Gemini 3.8 Flash
- Use Grok in ClineLists Grok Build 0.1
- Use Grok in Codex CLILists Grok Build 0.1
- Use Grok in ContinueLists Grok Build 0.1
- Use Grok in Kilo CodeLists Grok Build 0.1
- Use Grok in OpenCodeLists Grok Build 0.1
- Use Grok in Roo CodeLists Grok Build 0.1
- Use Grok in ZedLists Grok Build 0.1
Model pages
FAQ
How do Gemini 3.8 Flash and Grok Build 0.1 compare on price?
On list price, Gemini 3.8 Flash charges 25% less than Grok Build 0.1 for input ($0.75 vs $1 per 1M tokens), and Gemini 3.8 Flash charges 1.9x Grok Build 0.1's output price ($3.75 vs $2 per 1M tokens). For one agent session of 1M input and 100K output tokens with no caching, that is $1.13 on Gemini 3.8 Flash and $1.20 on Grok Build 0.1. Prices are each provider's first-party list rates, verified October 17, 2026 and October 17, 2026.
What are the context windows of Gemini 3.8 Flash and Grok Build 0.1?
Gemini 3.8 Flash has a 1,048,576-token context window and Grok Build 0.1 256,000 tokens; Gemini 3.8 Flash returns up to 65,536 output tokens per response, and no primary source states a max output for Grok Build 0.1.
Are Gemini 3.8 Flash and Grok Build 0.1 open weights?
Gemini 3.8 Flash is closed-weights and is called through Google's API as gemini-3.8-flash. Grok Build 0.1 is closed-weights and is called through xAI's API as grok-build-0.1.
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- DeepSeek V4 Pro vs Grok Build 0.1Similar price, same tier
Sources
Gemini 3.8 Flash verified from ai.google.dev; Grok Build 0.1 verified from docs.x.ai. This page is as current as the older of the two: .
- https://ai.google.dev/gemini-api/docs/pricing
- https://docs.x.ai/developers/pricing
- https://ai.google.dev/gemini-api/docs/models/gemini-3.8-flash
- https://ai.google.dev/gemini-api/docs/changelog
- https://ai.google.dev/gemini-api/docs/models
- https://docs.x.ai/developers/models/grok-build-0.1
- https://docs.x.ai/developers/release-notes
- https://x.ai/news
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