---
title: "grok-4-fast-reasoning - Model Details & Comparison"
description: "grok-4-fast-reasoning from Azure: capabilities, context limits, pricing, and side-by-side comparisons with alternative models."
url: "https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/azure/grok-4-fast-reasoning"
markdown: "https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/azure/grok-4-fast-reasoning.md"
---

# grok-4-fast-reasoning - Model Details & Comparison

> grok-4-fast-reasoning from Azure: capabilities, context limits, pricing, and side-by-side comparisons with alternative models.

## Important Links

- [View MCP Gateway](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/resources/mcp-gateway.md)
- [Features](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/#features)
- [Enterprise](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/enterprise)
- [Pricing](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/pricing.md)
- [Docs](https://docs.getbifrost.ai)
- [GitHub](https://github.com/maximhq/bifrost)
- [Book a Demo](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/book-a-demo)

## About grok-4-fast-reasoning

grok-4-fast-reasoning is a chat model from Azure, one of 203 chat models they offer. It is priced at $0.20 per 1M input tokens and $0.50 per 1M output tokens, ranking 816 out of 2669 chat models by cost and cheaper than 69% of models in this category. grok-4-fast-reasoning supports function calling, web search, structured output — one of only 7 chat models with this combination. It accepts up to 131K input tokens.

## Specifications

- **Azure Provider.**
- **Chat Mode.**
- **131,072 Max Input Tokens.**
- **131,072 Max Output Tokens.**
- **131,072 Max Tokens.**
- **$0.20 / 1M tokens Input Price.**
- **$0.50 / 1M tokens Output Price.**

## Capabilities

grok-4-fast-reasoning supports: Function Calling, Web Search, Response Schema, Tool Choice.

## grok-4-fast-reasoning Pricing Overview

At $0.20 per 1M input tokens and $0.50 per 1M output tokens, grok-4-fast-reasoning ranks 816 out of 2669 chat models by input cost. It is more affordable compared to the median of $0.50 for chat models, and is cheaper than 69% of models in this category.

grok-4-fast-reasoning is one of 203 Azure chat models, one of only 7 chat models combining function calling, structured output, web search.

## Models to Compare

Alternatives to grok-4-fast-reasoning with comparable capabilities.

| Model | Provider | Input $/1M | Output $/1M |
| --- | --- | --- | --- |
| gemini-flash-lite-latest | Google Gemini | $0.25 | $1.50 |
| gemini-3.1-flash-lite-preview | Google Gemini | $0.25 | $1.50 |
| gemini-3.1-flash-lite | Google Gemini | $0.25 | $1.50 |
| gpt-5.4-nano | OpenAI | $0.20 | $1.25 |
| gpt-5.4-nano-2026-03-17 | OpenAI | $0.20 | $1.25 |

- [Compare gemini-flash-lite-latest](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/gemini/gemini-flash-lite-latest.md)
- [Compare gemini-3.1-flash-lite-preview](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/gemini/gemini-3.1-flash-lite-preview.md)
- [Compare gemini-3.1-flash-lite](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/gemini/gemini-3.1-flash-lite.md)
- [Compare gpt-5.4-nano](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/openai/gpt-5.4-nano.md)
- [Compare gpt-5.4-nano-2026-03-17](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/openai/gpt-5.4-nano-2026-03-17.md)

## Related Resources

- [Calculate grok-4-fast-reasoning costs](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/llm-cost-calculator/provider/azure/model/grok-4-fast-reasoning.md)
- [Check Azure AI status](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/provider-status/azure.md)
- [All Azure pricing](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/llm-cost-calculator/provider/azure.md)

## FAQ

### Is grok-4-fast-reasoning cheaper than gemini-flash-lite-latest?

Yes. grok-4-fast-reasoning costs $0.20 per 1M input tokens compared to gemini-flash-lite-latest's $0.25 per 1M input tokens, making it 25% more affordable. Both are chat models and share support for vision, function calling, reasoning, web search, prompt caching, structured output.

### How does grok-4-fast-reasoning pricing compare to the average chat model?

grok-4-fast-reasoning input pricing is $0.20 per 1M tokens, which is 60% below the median of $0.50 for chat models. It ranks 816 out of 2669 chat models by input cost, making it cheaper than 69% of models in this category. For output, it costs $0.50 per 1M tokens compared to the median of $1.44.

### What makes grok-4-fast-reasoning different from other Azure models?

Among Azure's 203 chat models, grok-4-fast-reasoning ranks 42 by input cost. Its combination of function calling, structured output, web search is shared by only 6 other chat models.

### What are the best alternatives to grok-4-fast-reasoning?

The most comparable chat models to grok-4-fast-reasoning are: gemini-flash-lite-latest from Google Gemini ($0.25/1M input tokens); gemini-3.1-flash-lite-preview from Google Gemini ($0.25/1M input tokens); gemini-3.1-flash-lite from Google Gemini ($0.25/1M input tokens); gpt-5.4-nano from OpenAI ($0.20/1M input tokens). These alternatives were selected based on similar capabilities, pricing, and provider diversity. You can compare any of these models in detail using the Bifrost Model Library.

### How do I check if Azure AI is down?

You can monitor Azure AI service health in real time on the Bifrost Azure AI Status page. It tracks current component status, active incidents, and historical reliability data pulled from the official status page every 60 seconds.

### How do I calculate grok-4-fast-reasoning costs?

grok-4-fast-reasoning is priced based on input and output tokens. Use the interactive calculator at the top of this page to estimate costs for your specific workload. Enter your expected input and output tokens volume and the calculator will show the total cost breakdown. For reference, processing 1M input tokens costs $0.20 and generating 1M output tokens costs $0.50.

## Related Resources

- [Azure models](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/provider/azure.md)
- [Model library](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library.md)
- [LLM cost calculator](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/llm-cost-calculator.md)
- [Docs: Bifrost docs](https://docs.getbifrost.ai)
- [GitHub: maximhq/bifrost](https://github.com/maximhq/bifrost)
- [Pricing: Bifrost pricing](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/pricing.md)
- [Enterprise: Bifrost enterprise](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/enterprise)
- [Book a Demo: Bifrost demo](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/book-a-demo)
- [Resources: Bifrost resources](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/resources.md)

---

*This is a markdown version of [https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/azure/grok-4-fast-reasoning](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/azure/grok-4-fast-reasoning) for AI/LLM consumption.*