One agent session
1M input tokens and 100K output tokens, no caching.
- Input1M x $2 = $2.00
- Output0.1M x $6 = $0.60
$2.60per session
xAI - Closed weights
Grok 4.5 pricing and specs
Grok 4.5 is a closed-weights model from xAI that costs $2 per 1M input tokens and $6 per 1M output tokens on the first-party API, with a 500K-token context window.
Last verified from docs.x.ai. All sources
- Input / 1M
- $2
- Output / 1M
- $6
- Context
- 500K tokens
- Weights
- Closed
Pricing per 1M tokens
| Item | Price / 1M tokens |
|---|---|
| InputPrompts up to 200,000 tokens | $2 |
| OutputPrompts up to 200,000 tokens | $6 |
| Cache readPrompts up to 200,000 tokens | $0.30 |
| Long-context inputPrompts over 200,000 tokens | $4 |
| Long-context outputPrompts over 200,000 tokens | $12 |
| Long-context cache readPrompts over 200,000 tokens | $0.60 |
Note: Previous generation, still sold and priced. release date is the API release-notes entry (July 8, 2026); the x.ai 'Introducing Grok 4.5' post is dated July 16, 2026. Cached input is $0.30 (cheaper than 4.6/4.7 at $0.50). Aliases: grok-4.5-latest, grok-build-latest. max output not stated on any primary page. Long-context rates apply to all tokens once the prompt reaches 200k. Batch API not supported. Priority Processing 2x.
Specs
- Context window
- 500,000 tokens
- Release date
- Provider
- xAI
- API model id
grok-4.5- Vercel AI Gateway id
spacexai/grok-4.5- Weights
- Closed weights
What Grok 4.5 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 4.5 bills $4 input and $12 output for the whole request.
A chat app
10,000 requests a day at 2K input and 500 output tokens each.
- Input20M x $2 = $40.00
- Output5M x $6 = $30.00
$70.00per day
$2,100.00 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 $0.30 = $0.27
- Uncached input0.1M x $2 = $0.20
- Output0.1M x $6 = $0.60
$1.07per session
Compare with
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Grok 4.5 (this page) | $2 | $6 |
| Grok 4.6xAI | $2 | $6 |
| Grok 4.7xAI | $2 | $6 |
| Qwen3.8-2.4T-A95BAlibaba Cloud (Qwen) | $2 | $6 |
| Qwen3.8-MaxAlibaba Cloud (Qwen) | $2 | $6 |
| 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 |
Compare
Side-by-side pages with both models' prices, specs, cost examples and like-for-like benchmark rows.
Related reading
- Grok 4.5 in 10 Minutes: xAI's Fastest Model, 500K Context, and Build-Mode IntegrationGrok 4.5 in 10 minutes: xAI's flagship model with a 500K context window, function calling, structured outputs and build-mode agents, plus verified pricing.
- Grok 4.5 for Developers: What Changed and When to Pick ItGrok 4.5 for developers - $2/$6 per million tokens, a 500k context window, vendor benchmarks with caveats, and when to pick it over Claude, GPT, or Gemini.
- Grok 4.5: xAI Releases Cursor-Trained Coding Model at $2/M Input TokensGrok 4.5 coding model from xAI, trained on Cursor data: $2/M input pricing, benchmarks near Opus 4.7, the CursorBench caveat, and the Hacker News reaction.
- 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.
FAQ
How much does Grok 4.5 cost per million tokens?
Grok 4.5 costs $2 per 1M input tokens and $6 per 1M output tokens on xAI's first-party API, per docs.x.ai on October 17, 2026. Per 1M tokens, cache reads cost $0.30. Prompts over 200,000 tokens are billed at $4 input and $12 output for the whole request.
What is Grok 4.5's context window?
Grok 4.5 has a 500,000-token context window.
Are Grok 4.5's weights open?
No. Grok 4.5 is a closed-weights model. You call it through xAI's API as grok-4.5 or through Vercel AI Gateway as spacexai/grok-4.5.
When was Grok 4.5 released?
xAI released Grok 4.5 on July 8, 2026.
Sources
Last verified from docs.x.ai.
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