Mistral - Elixir client for the Mistral AI API

Hey everyone!

I’d like to share Mistral, an Elixir client for the Mistral AI API. The library has been on Hex for a while, but I haven’t posted about it here until now — and we just shipped v0.5.0 with a big batch of new features, so it felt like a good time.

With this release, Mistral covers almost all of the Mistral AI platform endpoints, making it the most complete Mistral client available for Elixir.

What it does

Mistral provides a simple, idiomatic Elixir interface to the Mistral AI platform:

client = Mistral.init("your_api_key")

{:ok, response} = Mistral.chat(client,
model: "mistral-small-latest",
messages: [
%{role: "user", content: "Write a haiku about Elixir"}
]
)

Features

• Chat Completions with function calling / tool use
• FIM (Fill-in-the-Middle) code completions
• Streaming with utilities for collecting, accumulating, and transforming chunks
  (Mistral.Streaming)
• Conversations API with multi-turn state management and helper utilities
  (Mistral.Conversations)
• Agents API (full CRUD, versioning, aliases, completions)
• Embeddings with similarity/distance utilities (Mistral.Embeddings)
• Classification & Moderation
• Batch Processing
• Fine-tuning
• File Operations (upload, download, list, delete)
• OCR
• Response Caching via ETS (Mistral.Cache)
• Automatic retry with exponential backoff and jitter
• Structured output (JSON mode + JSON Schema validation)

What’s new in v0.5.0

This release adds 48+ new API functions and 5 utility modules. The highlights:

• Conversations, Agents, Classification, Batch, FIM, and Fine-tuning APIs —
  near-complete coverage of the Mistral platform
• Mistral.Streaming — collect_content/1, accumulate_response/1, tee/2, merge/1,
  and more for working with SSE streams
• Mistral.Embeddings — cosine similarity, euclidean distance, ranking, and batch
  comparisons
• Mistral.Cache — optional ETS-based response caching for deterministic endpoints
• Mistral.Conversations — helpers for extracting content, managing history, and
  sliding window context
• Automatic retry — transient errors (408, 429, 5xx) are retried with exponential
  backoff by default

Full changelog: mistral/CHANGELOG.md at main · rodloboz/mistral · GitHub

Links

• Hex: mistral | Hex
• Docs: Mistral v0.5.0 — Documentation
• GitHub:

https://github.com/rodloboz/mistral

{:mistral, “~> 0.5.0”}

Feedback, issues, and PRs are very welcome!