Does xAI Grok 4 Fast Non-Reasoning have a free tier?

xAI Grok 4 Fast Non-Reasoning is billed per use and the record publishes no free-tier allowance. The current published rates are input $0.2000 per 1M tokens and output $0.5000 per 1M tokens. Trial credit or promotional quota is tied to your account rather than to the model, so check the console before planning around a free tier.

When was xAI Grok 4 Fast Non-Reasoning released, and is it still maintained?

xAI Grok 4 Fast Non-Reasoning was released on 2025-09-19. Its catalog status is stable. Check the model page for deprecation notices before you build a long-lived integration on it.

How does xAI Grok 4 Fast Non-Reasoning compare with grok-4-1-fast-non-reasoning, and what should you compare?

xAI Grok 4 Fast Non-Reasoning sits alongside grok-4-1-fast-non-reasoning , grok-3 , gemini-2.5-flash-lite in the catalog. Compare them on the dimensions that change your bill and your users’ experience: task quality on your own prompts, latency at your concurrency, context and output limits, and cost per completed task rather than per token.

How does xAI Grok 4 Fast Non-Reasoning score on benchmarks?

Recorded results for xAI Grok 4 Fast Non-Reasoning: aa_intelligence_index 14.7. Benchmark positions are a coarse filter only — run your own prompts against the candidate models before you commit, because ranking shifts with task shape and prompt style.

Can you call xAI Grok 4 Fast Non-Reasoning with the OpenAI SDK you already use?

Yes. xAI Grok 4 Fast Non-Reasoning is reachable through an OpenAI-compatible endpoint, so an existing OpenAI SDK client works after pointing the base URL at MixRoute and setting the model parameter to grok-4-fast-non-reasoning . Keep your current request and response handling.

Model detail

xAI Grok 4 Fast Non-Reasoning

Provided by xAI

Pay-as-you-go

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model on xAI's [news post](http://x.ai/news/grok-4-fast). Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)

Model specs

Model ID: grok-4-fast-non-reasoning

Context length: 2M
Max output: 2M
I/O modalities
Released: 2025-09

API endpoints

One MixRoute gateway, OpenAI-compatible

OpenAI-compatible /v1/chat/completions POST

Pricing

Flat rate, unit: /1M Tokens

Input

$0.2000 /1M Tokens

Completion

$0.5000 /1M Tokens

Cache read

$0.0500 /1M Tokens

Selection summary

Quickly judge whether it fits your workload

What is this model good for?

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency

What should you check before using it?

2,000,000 context, 2,000,000 output tokens

xAI model that supports tool calling and structured output. Knowledge cutoff: 2025-09. Released 2025-09-19.

Why use it through MixRoute?

Swap the base URL, keep the xAI Grok 4 Fast Non-Reasoning client

MixRoute serves xAI Grok 4 Fast Non-Reasoning on the OpenAI-compatible endpoint /v1/chat/completions; point your existing client at https://api.mixroute.ai/v1 with the model ID grok-4-fast-non-reasoning and re-run your integration tests.

Capabilities & compatibility

Unconfirmed capabilities stay "Unknown," no guesses

Tool calling

xAI Grok 4 Fast Non-Reasoning supports function and tool calls.

EX Send a tools definition; the response returns tool_calls to execute and feed results back.

Structured output

xAI Grok 4 Fast Non-Reasoning can produce JSON-formatted output on demand.

EX response_format: { type: "json_schema" } forces valid JSON output.

Streaming

xAI Grok 4 Fast Non-Reasoning supports streamed responses.

EX stream: true streams tokens incrementally, so chat UIs render as they arrive.

Prompt caching

xAI Grok 4 Fast Non-Reasoning supports prompt caching under supported routing conditions.

EX Keep the system prompt and tool definitions at the start of the request; repeated prefixes are automatically billed at the cache-read rate.

Vision input

xAI Grok 4 Fast Non-Reasoning can process image inputs alongside text.

EX Pass a base64-encoded image in a image_url content part alongside text messages.

OpenAI SDK

Call xAI Grok 4 Fast Non-Reasoning through MixRoute's OpenAI-compatible endpoint.

EX Change base_url to https://api.mixroute.ai/v1; everything else follows the OpenAI style.

Token cost estimator

Live estimate from this page's pricing, not an actual bill

Input tokens Max per request 2M

Output tokens Max per request 2M

Requests / month

Cache hit rate 0%

Share of the same prefix read repeatedly, up to 100%

FAQ

Prompt caching on xAI Grok 4 Fast Non-Reasoning bills cached input at $0.05 per 1,000,000 token instead of $0.20 per 1,000,000 token for standard input. The saving applies to the cached prefix only; the rest of the request is billed normally.

Get started

01

Create an API key

Generate a key in the Console; one key calls every model.
02

Set the base URL

Fully OpenAI SDK-compatible; just swap the URL to connect.

https://api.mixroute.ai/v1
03

Specify the model ID

In the request's model field, enter:

grok-4-fast-non-reasoning

Create an API key

New users get $5 in free credits

Test this model and alternate routes with the same request format

Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.

Create an API key View integration docs