How Codestral 22B is Leading the Charge in AI Code Generation

8 min read


Artificial intelligence has revolutionized numerous fields, and code generation is no exception. In software development, teams harness AI models to automate and enhance coding tasks, reducing the time and effort developers require. They train these AI models on vast datasets encompassing many programming languages, enabling the models to assist in diverse coding environments. One of the primary functions of AI in code generation is to predict and complete code snippets, thereby aiding in the development process. AI models like Codestral by Mistral AI, CodeLlama, and DeepSeek Coder are designed explicitly for such tasks.

These AI models can generate code, write tests, complete partial codes, and even fill in the middle of existing code segments. These capabilities make AI tools indispensable for modern developers who seek efficiency and accuracy in their work. Integrating AI in coding speeds up development and minimizes errors, leading to more robust software solutions. This article will look at Mistral AI’s latest development, Codestral.

The Importance of Performance Metrics

Performance metrics play a critical role in evaluating the efficacy of AI models in code generation. These metrics provide quantifiable measures of a model’s ability to generate accurate and functional code. The key benchmarks used to assess performance are HumanEval, MBPP, CruxEval, RepoBench, and Spider. These benchmarks test various aspects of code generation, including the model’s ability to handle different programming languages and complete long-range repository-level tasks.

For instance, Codestral 22B’s performance on these benchmarks highlights its superiority in generating Python and SQL code, among other languages. The model’s extensive context window of 32k tokens allows it to outperform competitors in tasks requiring long-range understanding and completion. Metrics such as HumanEval assess the model’s ability to generate correct code solutions for problems, while RepoBench evaluates its performance in repository-level code completion.

Accurate performance metrics are essential for developers when choosing the right AI tool. They provide insights into how well a model performs under various conditions and tasks, ensuring developers can rely on these tools for high-quality code generation. Understanding and comparing these metrics enables developers to make informed decisions, leading to more effective and efficient coding workflows.

Mistral AI: Codestral 22B

Mistral AI developed Codestral 22B, an advanced open-weight generative AI model explicitly designed for code generation tasks. The company Mistral AI introduced this model as part of its initiative to empower developers and democratize coding. The company created its first code model to help developers write and interact with code efficiently through a shared instruction and completion API endpoint. The need to provide a tool that not only masters code generation but also excels in understanding English drove the development of Codestral, making it suitable for designing advanced AI applications for software developers.

Also Read: Mixtral 8x22B by Mistral AI Crushes Benchmarks in 4+ Languages

Key Features and Capabilities

Codestral 22B boasts several key features that set it apart from other code generation models. These features ensure that developers can leverage the model’s capabilities across various coding environments and projects, significantly enhancing their productivity and reducing errors.

Context Window

One of the standout features of Codestral 22B is its extensive context window of 32k tokens, which is significantly larger compared to its competitors, such as CodeLlama 70B, DeepSeek Coder 33B, and Llama 3 70B, which offer context windows of 4k, 16k, and 8k tokens respectively. This large context window allows Codestral to maintain coherence and context over longer code sequences, making it particularly useful for tasks requiring a comprehensive understanding of large codebases. This capability is crucial for long-range repository-level code completion, as evidenced by its superior performance on the RepoBench benchmark.

Language Proficiency

Codestral 22B is trained on a diverse dataset encompassing over 80 programming languages. This broad language base includes popular languages such as Python, Java, C, C++, JavaScript, and Bash, as well as more specific ones like Swift and Fortran. This extensive training enables Codestral to assist developers across various coding environments, making it a versatile tool for various projects. Its proficiency in multiple languages ensures it can generate high-quality code, regardless of the language used.

Fill-in-the-Middle Mechanism

Another notable feature of Codestral 22B is its fill-in-the-middle (FIM) mechanism. This mechanism allows the model to complete partial code segments accurately by generating the missing portions. It can complete coding functions, write tests, and fill in any gaps in the code, thus saving developers considerable time and effort. This feature enhances coding efficiency and helps reduce the risk of errors and bugs, making the coding process more seamless and reliable.

Performance Highlights

Codestral 22B sets a new standard in code generation models’ performance and latency space. It outperforms other models in various benchmarks, demonstrating its ability to handle complex coding tasks efficiently. In the HumanEval benchmark for Python, Codestral achieved an impressive pass rate, showcasing its ability to generate functional and accurate code. It also excelled in the MBPP sanitized pass and CruxEval for Python output prediction, further cementing its status as a top-performing model.

In addition to its Python capabilities, Codestral’s performance was evaluated in SQL using the Spider benchmark, which also showed strong results. Moreover, it was tested across multiple HumanEval benchmarks in languages such as C++, Bash, Java, PHP, TypeScript, and C#, consistently delivering high scores. Its fill-in-the-middle performance was particularly notable in Python, JavaScript, and Java, outperforming models like DeepSeek Coder 33B.

These performance highlights underscore Codestral 22B’s prowess in generating high-quality code across various languages and benchmarks, making it an invaluable tool for developers looking to enhance their coding productivity and accuracy.

Comparative Analysis

Benchmarks are critical metrics for assessing model performance in AI-driven code generation. There was an evaluation of Codestral 22B, CodeLlama 70B, DeepSeek Coder 33B, and Llama 3 70B across various benchmarks to determine their effectiveness in generating accurate and efficient code. These benchmarks include HumanEval, MBPP, CruxEval-O, RepoBench, and Spider for SQL. Additionally, they tested the models on HumanEval in multiple programming languages such as C++, Bash, Java, PHP, Typescript, and C# to provide a comprehensive performance overview.

Performance in Python

Python remains one of the most significant languages in coding and AI development. Evaluating the performance of code generation models in Python offers a clear perspective on their utility and efficiency.


HumanEval is a benchmark designed to test the code generation capabilities of AI models by evaluating their ability to solve human-written programming problems. Codestral 22B demonstrated an impressive performance with an 81.1% pass rate on HumanEval, showcasing its proficiency in generating accurate Python code. In comparison, CodeLlama 70B achieved a 67.1% pass rate, DeepSeek Coder 33B reached 77.4%, and Llama 3 70B achieved 76.2%. This illustrates that Codestral 22B is more effective in handling Python programming tasks than its counterparts.


The MBPP (Multiple Benchmarks for Programming Problems) benchmark evaluates the model’s ability to solve diverse and sanitized programming problems. Codestral 22B performed with a 78.2% success rate in MBPP, slightly behind DeepSeek Coder 33B, which scored 80.2%. CodeLlama 70B and Llama 3 70B showed competitive results with 70.8% and 76.7%, respectively. Codestral’s strong performance in MBPP reflects its robust training on diverse datasets.


CruxEval-O is a benchmark for evaluating the model’s ability to predict Python output accurately. Codestral 22B achieved a pass rate of 51.3%, indicating its solid performance in output prediction. CodeLlama 70B scored 47.3%, while DeepSeek Coder 33B and Llama 3 70B scored 49.5% and 26.0%, respectively. This shows that Codestral 22B excels in predicting Python output compared to other models.


RepoBench evaluates long-range repository-level code completion. Codestral 22B, with its 32k context window, significantly outperformed other models with a 34.0% completion rate. CodeLlama 70B, DeepSeek Coder 33B, and Llama 3 70B scored 11.4%, 28.4%, and 18.4%, respectively. The larger context window of Codestral 22B provides it with a distinct advantage in completing long-range code generation tasks.

Comparative Analysis of Codestral 22B by Mistral AI with other AI models

SQL Benchmark: Spider

The Spider benchmark tests SQL generation capabilities. Codestral 22B achieved a 63.5% success rate in Spider, outperforming its competitors. CodeLlama 70B scored 37.0%, DeepSeek Coder 33B 60.0%, and Llama 3 70B 67.1%. This demonstrates that Codestral 22B is proficient in SQL code generation, making it a versatile tool for database management and query generation.

By analyzing these benchmarks, it is evident that Codestral 22B excels in Python and performs competitively in various programming languages, making it a versatile and powerful tool for developers.

Comparative Analysis of Codestral 22B by Mistral AI with other AI models

How to Access Codestral?

You can follow these easy steps and use the Codestral.

Using Chat Window

  1. Create an account

    Access this link and and create your account. 

  2. Select the Model

    You’ll be greeted with a chat-like window on your screen. If you look closely, there’s a dropdown just below the prompt box where you can select the model you want to work with. Here, we’ll select Codestral.

  3. Give the prompt

    Step 3: After selecting the Codestral, you are ready to give your prompt.

Using Codestral API

Codestral 22B provides a shared instruction and completion API endpoint that allows developers to interact with the model programmatically. This API enables developers to leverage the model’s capabilities in their applications and workflows. 

Using Codestral API | Code Generation

In this section, we’ll demonstrate using the Codestral API to generate code for a linear regression model in scikit-learn and to complete a sentence using the fill-in-the-middle mechanism.

First, you need to generate the API key. To do so, create an account at and generate your API key in the Codestral section.

Using Codestral API | Code Generation

As it’s being rolled out slowly, you may be unable to use it instantly.

Code Implementation

import requests

import json

# Replace with your actual API key

API_KEY = userdata.get('Codestral_token')

# The endpoint you want to hit

url = ""

# The data you want to send

data = {

   "model": "codestral-latest",

   "messages": [

       {"role": "user", "content": "Write code for linear regression model in scikit learn with scaling, you can select  diabetes datasets from the sklearn library."}



# The headers for the request

headers = {

   "Authorization": f"Bearer {API_KEY}",

   "Content-Type": "application/json"


# Make the POST request

response =, data=json.dumps(data), headers=headers)

# Print the response



Using Codestral API | Code Generation

I have made a Colab Notebook on using the API to generate responses from the Codestral, which you can refer to. Using the API, I have generated a fully working Regression model Code, which you can run directly after making a few small changes in the output.  


Codestral 22B by Mistral AI is a pivotal tool in AI-driven code generation, demonstrating exceptional performance across multiple benchmarks such as HumanEval, MBPP, CruxEval-O, RepoBench, and Spider. Its large context window of 32k tokens and proficiency in over 80 programming languages, including Python, Java, C++, and more, set it apart from competitors. The model’s advanced fill-in-the-middle mechanism and seamless integration into popular development environments like VSCode, JetBrains, LlamaIndex, and LangChain enhance its usability and efficiency.

Positive feedback from the developer community underscores its impact on improving productivity, reducing errors, and streamlining coding workflows. As AI continues to evolve, Codestral 22B’s comprehensive capabilities and robust performance position it as an indispensable asset for developers aiming to optimize their coding practices and tackle complex software development challenges.


Frequently Asked Questions

Lorem ipsum dolor sit amet, consectetur adipiscing elit,

Responses From Readers