# Ollama v0.21.0 — Release & Upgrade Intelligence
- **Product:** Ollama (https://ollama.com)
- **Version:** v0.21.0
- **Released:** Apr 16, 2026
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/ollama/updates/v0.21.0/

## Executive Summary (TL;DR)
Ollama v0.21.0. Source highlight: ollama launch hermes

## Breaking Changes & Deprecations
- - **Fixed the Gemma 4 compiler error** that was breaking Metal builds.
- - **Fixed macOS cross-compiles** so they no longer trigger `generate`, which was breaking cmake builds on some Xcode versions.

## New Features
- **Gemma 4 on MLX.** Added support for running Gemma 4 via MLX on Apple Silicon, including a text-only MLX runtime for the model. The MLX backend also picked up mixed-precision quantization, better capability detection, and a batch of new op wrappers (Conv2d, Pad, activations, trig, masked SDPA, and RoPE-with-freqs).
- **Hermes and GitHub Copilot CLI in `ollama launch`.** Added both integrations, which can now be configured in one command alongside the rest of the supported coding agents.

## Bug Fixes
- **Fixed `ollama launch openclaw --yes`** so it correctly skips the channels configuration step, so non-interactive setups complete cleanly.
- **Fixed the Gemma 4 compiler error** that was breaking Metal builds.
- **Fixed macOS cross-compiles** so they no longer trigger `generate`, which was breaking cmake builds on some Xcode versions.