What are the core pricing models for Atlas and Crush in 2026?

In 2026, Atlas offers a free core, requiring users to bring their own model keys. Crush also provides a free CLI and requires users to bring their own keys, with Charm Hyper credits available around $0.05 each, including 100 free per month.

How do Atlas and Crush handle code context for AI models?

Crush uses LSP integration to feed real language-server context to the model. Atlas indexes code by AST declarations using tree-sitter and searches with hybrid semantic and keyword retrieval, also supporting local Ollama embeddings.

Can I switch AI models during a session with Atlas or Crush?

Yes, Crush allows switching models mid-session without losing conversation context. Atlas also lets you switch the active model and provider on the fly, supporting favorites and recents.

What safety features does Atlas provide for applying code changes?

Atlas drafts a plan in a read-only agent, asks for approval before building, computes a unified diff for every file edit for approval, and permission-gates all tool calls against allow, ask, and deny rules.

Is Crush considered OSI open source in 2026?

No, in 2026, Crush is source-available under the FSL-1.1-MIT license, which includes a two-year commercial-compete restriction, meaning it is not OSI open source today.

Does Atlas offer any privacy features for code indexing?

Yes, Atlas can build its code index with local Ollama embeddings, which helps keep code off third-party servers.

Atlas vs Crush: Terminal AI Coding Agents in 2026

In 2026, developers choosing between terminal AI coding agents Atlas and Crush will find distinct approaches to code interaction and agent behavior. Atlas provides a terminal-native TUI with comprehensive planning and diffing capabilities, ensuring every change is reviewed. Crush, on the other hand, integrates directly with Language Server Protocols for enhanced code context and allows model switching mid-session without losing conversational flow.

Licensing and Open Source Model

For developers in 2026, Atlas offers a free core with a traditional open source approach, while Crush operates under an FSL-1.1-MIT license that includes a two-year commercial-compete restriction, meaning it is not OSI open source today.

Atlas provides its core functionality for free, allowing users to bring their own model keys without licensing restrictions on commercial use. This aligns with a standard open source model, fostering broad adoption and community contributions. In contrast, Crush is source-available under the FSL-1.1-MIT license. This license includes a specific two-year commercial-compete restriction, which means that while the source code is available, its use in directly competitive commercial products is restricted for a period. This distinction is crucial for organizations and developers who require strict OSI-compliant open source software for their projects or commercial offerings. Atlas's model ensures immediate and unrestricted commercial use of its core, whereas Crush's licensing requires careful consideration of its commercial-compete clause until 2028.

Code Understanding and Context Integration

Crush distinguishes itself with LSP integration, feeding real language-server context to the model instead of raw file text, a key advantage for precise code understanding in 2026. Atlas, however, indexes code by AST declarations using tree-sitter, not blind line windows.

Crush's approach to code understanding is deeply integrated with Language Server Protocols (LSP). This means it can feed rich, real-time language-server context directly to the AI model, providing a more nuanced and accurate understanding of the codebase than simply processing raw file text. This can lead to more contextually aware suggestions and modifications. Atlas employs a different, yet robust, method for code indexing. Atlas indexes code by AST declarations using tree-sitter, which allows it to understand the structural components of code rather than relying on blind line windows. Furthermore, Atlas searches code with hybrid semantic and keyword retrieval fused by reciprocal rank fusion, enhancing its ability to find relevant code segments. Atlas can also build its code index with local Ollama embeddings, keeping sensitive code off third-party servers, a significant privacy benefit. Both agents aim for deep code understanding, but Crush's LSP integration offers a direct pipeline to language-server intelligence, while Atlas focuses on structural analysis and flexible retrieval methods.

Change Review and Safety Mechanisms

Atlas prioritizes developer safety and control, drafting a plan in a read-only plan agent and asking for approval before switching to a build agent, a critical step for every change in 2026. Crush, lacking a proprietary harness layer, relies entirely on the model's output quality.

Atlas implements a multi-stage safety protocol for all code modifications. Before any changes are applied, Atlas drafts a plan in a read-only plan agent and asks for explicit approval before switching to a build agent. This ensures developers understand the proposed actions. Furthermore, Atlas computes a unified diff for every file edit and surfaces it for approval before writing, giving granular control over each modification. Every Atlas tool call is permission-gated against allow, ask, and deny rules before it runs, adding another layer of security. Atlas also snapshots file changes as git patches so edits can be diffed and rolled back, providing robust version control integration. In contrast, Crush operates without a proprietary harness layer, meaning its output quality and safety mechanisms are entirely a function of the model you bring. While Crush offers per-project config and permission allowlists for its Model Context Protocol (MCP) over stdio, HTTP, and SSE, it does not inherently provide the same multi-stage planning, explicit diff approval, or permission-gated tool calls that Atlas does. This makes Atlas a more opinionated choice for developers seeking built-in safeguards and explicit control over AI-driven changes.

Deployment and Portability

Crush offers broad platform support as a single static binary across macOS, Linux, Windows, the BSDs, and Android, making it highly portable for developers in 2026. Atlas also ships as a single self-contained binary, providing a terminal-native TUI experience.

Both Atlas and Crush are designed for ease of deployment, shipping as single, self-contained binaries. This simplifies installation and reduces dependency management for users. Crush boasts extensive platform compatibility, available across macOS, Linux, Windows, the BSDs, and Android, offering a wide reach for developers working on diverse operating systems. Atlas is also a single self-contained binary and provides a terminal-native TUI that runs directly in your shell. While Atlas's specific platform list is not as explicitly detailed as Crush's, its terminal-native nature implies broad Unix-like system compatibility. Atlas also ships with a TUI theme system, including a charcoal-and-blue default theme and many presets, enhancing the user experience within the terminal environment. The key difference lies in Crush's explicit support for a broader range of less common operating systems like the BSDs and Android, potentially making it a more versatile choice for highly specialized development environments.

Model Interaction and Extensibility

Crush allows developers to switch models mid-session without losing the conversation context, a valuable feature for iterative development in 2026. Atlas also supports switching the active model and provider on the fly with favorites and recents, and offers robust plugin extensibility.

Both Atlas and Crush allow developers to bring their own model keys, offering flexibility in model choice. Crush's standout feature in this area is its ability to switch models mid-session while preserving the conversation context. This means a developer can experiment with different models or switch to a more powerful one for a complex task without losing the ongoing dialogue with the agent. Crush also supports the Model Context Protocol (MCP) over stdio, HTTP, and SSE, with per-project configuration and permission allowlists, providing flexible integration options. Atlas also provides significant model flexibility, letting users switch the active model and provider on the fly with favorites and recents. Beyond model switching, Atlas is highly extensible through plugins that contribute tools and hook into agent lifecycle events. Atlas also connects to Model Context Protocol servers and exposes their tools to the agent, ensuring compatibility with external AI services. Atlas further enhances its capabilities by fanning out work to subagents that can run in the foreground or in parallel background sessions, enabling complex, multi-step operations. While Crush excels at direct mid-session model changes, Atlas offers a broader extensibility framework and advanced subagent capabilities.

How to choose

Choose Atlas if

You require robust, built-in safety mechanisms like read-only planning, explicit diff approval, and permission-gated tool calls.
You need deep code understanding based on AST declarations and hybrid semantic/keyword retrieval, with local Ollama embeddings for privacy.
You value a highly extensible agent with plugin support and the ability to fan out work to parallel subagents.
You prefer a terminal-native TUI with a customizable theme system.
You need comprehensive git integration, including reading branches, status, diffs, and staging/committing changes.

Choose the alternative if

Your workflow benefits from switching AI models mid-session without losing conversational context.
You require direct LSP integration to feed real language-server context to the model for enhanced accuracy.
You need a single static binary that explicitly supports a very wide range of operating systems, including macOS, Linux, Windows, the BSDs, and Android.
You are comfortable with a source-available license (FSL-1.1-MIT) that includes a two-year commercial-compete restriction.
You prefer an agent that is purely local, without cloud agent, remote execution, or PR automation features.

Frequently asked questions

What are the core pricing models for Atlas and Crush in 2026?: In 2026, Atlas offers a free core, requiring users to bring their own model keys. Crush also provides a free CLI and requires users to bring their own keys, with Charm Hyper credits available around $0.05 each, including 100 free per month.
How do Atlas and Crush handle code context for AI models?: Crush uses LSP integration to feed real language-server context to the model. Atlas indexes code by AST declarations using tree-sitter and searches with hybrid semantic and keyword retrieval, also supporting local Ollama embeddings.
Can I switch AI models during a session with Atlas or Crush?: Yes, Crush allows switching models mid-session without losing conversation context. Atlas also lets you switch the active model and provider on the fly, supporting favorites and recents.
What safety features does Atlas provide for applying code changes?: Atlas drafts a plan in a read-only agent, asks for approval before building, computes a unified diff for every file edit for approval, and permission-gates all tool calls against allow, ask, and deny rules.
Is Crush considered OSI open source in 2026?: No, in 2026, Crush is source-available under the FSL-1.1-MIT license, which includes a two-year commercial-compete restriction, meaning it is not OSI open source today.
Does Atlas support plugins or extensibility?: Yes, Atlas is highly extensible through plugins that contribute tools and hook into agent lifecycle events, and it connects to Model Context Protocol servers.
What operating systems does Crush support as a single binary?: Crush ships as a single static binary across macOS, Linux, Windows, the BSDs, and Android, offering broad platform compatibility.
Does Atlas offer any privacy features for code indexing?: Yes, Atlas can build its code index with local Ollama embeddings, which helps keep code off third-party servers.

Try Atlas in your terminal

The terminal-native AI coding agent. Free core, single binary.

Install Atlas

Sources

Crush official site (github.com)

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