One agent session
1M input tokens and 100K output tokens, no caching.
- Input1M x $1 = $1.00
- Output0.1M x $2 = $0.20
$1.20per session
xAI - Closed weights
Grok Build 0.1 pricing and specs
Grok Build 0.1 is a closed-weights model from xAI that costs $1 per 1M input tokens and $2 per 1M output tokens on the first-party API, with a 256K-token context window.
Last verified from docs.x.ai. All sources
- Input / 1M
- $1
- Output / 1M
- $2
- Context
- 256K tokens
- Weights
- Closed
Pricing per 1M tokens
| Item | Price / 1M tokens |
|---|---|
| InputPrompts up to 200,000 tokens | $1 |
| OutputPrompts up to 200,000 tokens | $2 |
| Cache readPrompts up to 200,000 tokens | $0.20 |
| Long-context inputPrompts over 200,000 tokens | $2 |
| Long-context outputPrompts over 200,000 tokens | $4 |
| Long-context cache readPrompts over 200,000 tokens | $0.40 |
Note: release date is the API release-notes entry (May 19, 2026, 'early access'); the x.ai news post 'Grok Build 0.1 on API' (public beta) is dated May 29, 2026. Aliases on the model page include grok-code-fast-1, grok-code-fast and grok-code-fast-1-0825, so the old Grok Code Fast slugs now route here. Long-context rates apply to all tokens once the prompt reaches 200k. max output not stated on any primary page. Batch API not supported. Priority Processing bills 2x.
Specs
- Context window
- 256,000 tokens
- Release date
- Provider
- xAI
- API model id
grok-build-0.1- Vercel AI Gateway id
spacexai/grok-build-0.1- Weights
- Closed weights
What Grok Build 0.1 costs in practice
Worked from the standard list rates above, with the math shown so you can swap in your own token counts. These use the base rates, which apply while each request's prompt stays at or under 200,000 tokens; above that, Grok Build 0.1 bills $2 input and $4 output for the whole request.
A chat app
10,000 requests a day at 2K input and 500 output tokens each.
- Input20M x $1 = $20.00
- Output5M x $2 = $10.00
$30.00per day
$900.00 per 30-day month
The same session at a 90% cache hit
90% of the input is read from the prompt cache. The one-time cache write premium is not included.
- Cached input0.9M x $0.20 = $0.18
- Uncached input0.1M x $1 = $0.10
- Output0.1M x $2 = $0.20
$0.48per session
Compare with
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Grok Build 0.1 (this page) | $1 | $2 |
| GPT-3.5 Turbo InstructOpenAI | $1.50 | $2 |
| GPT-5 MiniOpenAI | $0.25 | $2 |
| Qwen3.5-35B-A3BAlibaba Cloud (Qwen) | $0.25 | $2 |
| Seed 2.0 LiteByteDance Seed | $0.25 | $2 |
| Grok 4.20xAI | $1.25 | $2.50 |
| Grok 4.20 (Non-Reasoning)xAI | $1.25 | $2.50 |
| Grok 4.20 Multi-Agent BetaxAI | $1.25 | $2.50 |
| Grok 4.3xAI | $1.25 | $2.50 |
| Grok 4.5xAI | $2 | $6 |
| Grok 4.6xAI | $2 | $6 |
Compare
Side-by-side pages with both models' prices, specs, cost examples and like-for-like benchmark rows.
- Grok Build 0.1 vs Mistral Large 4Similar price, same tier
- Grok Build 0.1 vs Gemini 3.8 FlashSimilar price, same tier
- Grok Build 0.1 vs GLM-5.3Similar price, same tier
- Grok Build 0.1 vs Mistral Medium 3.5Similar price, same tier
- Grok Build 0.1 vs DeepSeek V4 ProSimilar price, same tier
- Grok Build 0.1 vs GPT-5.4 MiniSimilar price, same tier
- Grok Build 0.1 vs Kimi K2.7 CodeSimilar price, same tier
Related reading
- GPT-6 Sol vs Claude Opus 5.5 vs Grok 4.7: The September 2026 Price WarGPT-6 Sol vs Claude Opus 5.5 vs Grok 4.7 pricing: verified per-token rates, cost-per-task math and a decision guide for the September 2026 price war.
- Grok Bot's Core Primitive: Every Bot Gets a ComputerGrok Bot gives every Bot a persistent cloud computer with a browser and terminal. Why that one primitive explains routines, Bot teams, and always-on work.
- Grok Bot's Meta Controls: Oversight as a Product PrimitiveGrok Bot's meta controls make agent oversight a product primitive: approval gates, a chief-of-staff structure and escalation learning, not a settings page.
- Grok Bot Has the Right Shape: Four Primitives, Nothing ElseGrok Bot ships four primitives that compose - a text thread, its own cloud computer, a chief of staff over Bots, and show-it-once routines - and nothing else.
- Grok Bot Routines: Automations Without Automation-BuildingGrok Bot routines let you demonstrate a job once, correct it in plain language and hand the Bot the schedule. How it works and how approval gates keep it safe.
- Grok 4.6: xAI's Agent-Focused Update Matches GPT-5.6 Sol at the Same $2/$6 PriceGrok 4.6 release guide: xAI's agent-focused update matches GPT-5.6 Sol on the AA index at the same $2/$6 pricing, and runs in Cursor and OpenCode.
FAQ
How much does Grok Build 0.1 cost per million tokens?
Grok Build 0.1 costs $1 per 1M input tokens and $2 per 1M output tokens on xAI's first-party API, per docs.x.ai on October 17, 2026. Per 1M tokens, cache reads cost $0.20. Prompts over 200,000 tokens are billed at $2 input and $4 output for the whole request.
What is Grok Build 0.1's context window?
Grok Build 0.1 has a 256,000-token context window.
Are Grok Build 0.1's weights open?
No. Grok Build 0.1 is a closed-weights model. You call it through xAI's API as grok-build-0.1 or through Vercel AI Gateway as spacexai/grok-build-0.1.
When was Grok Build 0.1 released?
xAI released Grok Build 0.1 on May 19, 2026.
Sources
Last verified from docs.x.ai.
Newsletter
Get model price changes as they ship
One email per week. New model releases, price cuts and what they mean for your bill.